JAVA Programs



Q1. Write a program that implements the Concept of Encapsulation.
class Emp
{
private int empid;
private String name;
public Emp( int x,String y)
{
empid=x;
name=y;
}
public void show()
{
System.out.println("empid="+empid);
System.out.println("name="+name);
}
}
class Encap
{
public static void main(String arg[])
{
int eid=Integer.parseInt(arg[0]);
String ename=arg[1];
Emp e1=new Emp(eid,ename);
e1.show();
}
}
Output:-







Q2. WAP to demonstrate concept of Polymorphism (Overloading).
class Overloaddemo
{
   void test()
   {
               System.out.println("No Parameters");
   }
//Overload test for one integer parameter
   void test(int a)
   {
            System.out.println("a:"+a);
   }
 //Overload test for two integer parameter
 void test(int a, int b)
  {
             System.out.println("a & b:"+a +" "+b);
  }
  //overload test for double parameter
  double test(double a)
   {
              System.out.println("Double a:"+a);
                        return a*a;
   }
 }
  class Overload
   {
              public static void main(String args[])
              {
              Overloaddemo ob= new Overloaddemo();
              double result;

//call all version of test()
                        ob.test();
                        ob.test(10);
                        ob.test(10,20);
                        result=ob.test(123.25);
                        System.out.println("Result of ob.test(123.25):"+result);

              }
}
 

Output:-





Q2(a) Write a Program to demonstrate concept of Polymorphism (Overriden).
class Funcover
{
public void calc(int x,int y)
{
int z;
z=x*y;
System.out.println("multiplication="+z);
}
}
class Override extends Funcover
{
public void calc(int x,int y)
{
int z;
z=x/y;
System.out.print("division="+z);
}
}
class Overrideex
{
public static void main(String arg[])
{
Funcover f1=new Funcover();
f1.calc(7,6);
Override f2=new Override();
f2.calc(14,2);
}
}

Output:-







 
Q3 Write a Program the use boolean data type and print the Prime number Series upto 50.


class Primetest
{
public static void main(String args[])
{
int num,i;
boolean prime=true;
for(num=3;num<=50;num++)
{
prime=true;
for(i=2;i<=num/2;i++)
{
if(num%i==0)
{
prime=false;
}}
if(prime)
System.out.println(""+num);
}}}

Output:-
 





Q4 Write a Program for Matrix Multiplication and Transpose using Input/Output Stream.


import java.io.*;

class Mat
{
public static void main(String args[]) throws Exception
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.println("1. Transpose of Matrix");
System.out.println("2. Matrix multiplication");
System.out.println("Any other choice for exit the prg");

System.out.print("\n\nEnter Your choice");
int ch=Integer.parseInt(br.readLine());

switch(ch)
{
case 1:
        System.out.println("Enter the order of matrix");
        int n,m;
        n=Integer.parseInt(br.readLine());
        m=Integer.parseInt(br.readLine());
        int a[][]=new int[10][10];
        System.out.print("enter the "+m*n+" elements of matrix");
        for(int i=0;i<n;i++)
        {
        for(int j=0;j<m;j++)
        {
        a[i][j]=Integer.parseInt(br.readLine());
        }
        }
        System.out.println("Origional Matrix is::");
        show(n,m,a);
        System.out.println("After Transpose Matrix become::");
        for(int i=0;i<m;i++)
        {
        for(int j=0;j<n;j++)
        {
        System.out.print(a[j][i]+" ");
        }
        System.out.println();
        }
        break;

case 2:
        int i,j,s;
        int m1,n1,p,q;
                int a1[][]=new int[10][10];
                        int b[][]=new int[10][10];
                        int c[][]=new int[10][10];
        System.out.print("Enter no. of Row of First Matrix->");
        m1=Integer.parseInt(br.readLine());
          System.out.print("Enter no. of Column of First Matrix->");
        n1=Integer.parseInt(br.readLine());
          System.out.print("Enter no. of Row of Second Matrix->");
        p=Integer.parseInt(br.readLine());
          System.out.print("Enter no. of Column of Second Matrix->");
          q=Integer.parseInt(br.readLine());
        if(n1!=p)
          {
          System.out.println("\n\nMatrix Multyply Fail!!---Matrix should be Identical");
          break;
          }
          System.out.println("Enter First Matrix");
        for(i=0;i<m1;i++)
          {
                for(j=0;j<n1;j++)
                   {
                   System.out.print("Enter Element at " + (i+1) + " Row and " + (j+1) + " Column ->");
                a1[i][j]=Integer.parseInt(br.readLine());
                   }
          }
          System.out.println("Enter Second Matrix");
          for(i=0;i<p;i++)
          {
                   for(j=0;j<q;j++)
                   {
                   System.out.print("Enter Element at " + (i+1) + " Row and " + (j+1) + " Column ->");
                   b[i][j]=Integer.parseInt(br.readLine());
                   }
          }

        for(i=0;i<m1;i++)
          {
         for(j=0;j<q;j++)
          {
        c[i][j]=0;
                for(s=0;s<n1;s++)
                c[i][j]+=a1[i][s]*b[s][j];
          }
          }
       System.out.println("First Array:");
        show(m1,n1,a1);
        System.out.println("Second Array:");
        show(p,q,b);
          System.out.println("Multiplied Array:");
        show(m1,q,c);
          break;

default:
         
       
}       
}
public static void show(int n,int m,int a[][])
{
for(int i=0;i<n;i++)
{
for(int j=0;j<m;j++)
{
System.out.print(a[i][j]+" ");
}
System.out.println();
}
}

}
OUTPUT:-





Q5. Write a Program for Vector class when input elements as            argument and copy the element into an array.

import java.util.*;
import java.io.*;

class Vectordemo
{
public static void main(String args[])throws Exception
{

Vector v = new Vector();

               
int n=Integer.parseInt(args[0]);
               
        for(int i=1;i<=n;i++)
v.addElement(args[i]);
               
         v.insertElementAt(v.elementAt(n-1),0);
         v.insertElementAt(v.elementAt(n-1),1);
                                 v.insertElementAt(v.elementAt(n-1),2);
         v.removeElementAt(v.size()-1);
         v.removeElementAt(v.size()-1);
         v.removeElementAt(v.size()-1);
               
System.out.println("After rearrangement :"+v);
System.out.println("Size of Vector  :"+v.size());
Object array[]=new Object[v.size()];
v.copyInto(array);
System.out.println("Content of Array:");
for(int i =0;i<n;i++)
 {
System.out.println(array[i]);
 }
}
}                             
         
Output:-







Program-6

 wap a program to check given string is palindrom or not
import java.io.*;
class Palindromedemo
{
    public static void main(String []args)throws Exception
    {
                int i,j;
                InputStreamReader isr=new InputStreamReader(System.in);
                BufferedReader br=new BufferedReader(isr);
                System.out.println("Enter the string to check");
                String str=br.readLine();
               
                for(i=0,j=str.length();i<str.length();i++,j--)
                 {
                   if(str.charAt(i)!=str.charAt(j-1))
          {
                    System.out.println("\n Entered String is not palindrome");
            break;
          }
         
         }

     if(i==str.length())
     System.out.println("\n Entered String is Palindrome");
 
   }
}
output:





Q7 WAP in java to arrange the string in alphabetical order.

class Stringordering
{
static String name[]={"Ram","Pooja","Monu","Kiran"};
public static void main(String arg[])
{
int size=name.length;
String temp=null;
for(int i=0;i<size;i++)
{
for(int j=i+1;j<size;j++)
{
if(name[i].compareTo(name[j])>0)
{
//swap the string
temp=name[i];
name[i]=name[j];
name[j]=temp;
}
}
}
for(int i=0;i<size;i++)
{
System.out.println(name[i]);
}
}
}
Output:-







                                                   PROGRAM-8
Write a program for string Buffer class which performs the all method of that class.


import java.io.*;

class Bufferstring
{
public static void main(String args[])throws Exception
{
           InputStreamReader isr=new InputStreamReader(System.in);
           BufferedReader br=new BufferedReader(isr);
            System.out.print("\n Enter the String :");
            StringBuffer str=new StringBuffer(br.readLine());
            System.out.println("Enter the second string  :");
           StringBuffer st=new StringBuffer(br.readLine());

                                     System.out.println("\n String Entered 1 : "+str);
                                      System.out.println("\n String Entered 2 : "+st);

                                     System.out.println("length of string1 :  "+str.length());
                                     System.out.println("Capacity of string1 : "+str.capacity());

                                    
                                  
                                     System.out.println("Enter the String to Insert  :");
                                     String str1=br.readLine();
                                     System.out.println("Enter the String to Insert  :");
                                     //String  str2=br.readLine();
                                     System.out.println("\n After Insertion :"+str.insert(2,str1));
                                    System.out.println("charAt(1)    "+str.charAt(1));
                                   System.out.println("Append : "+str.append(st));
                                  
                                 
}
}

OUTPUT:-







Q9. Write a program to calculate simple interest using the wrapper class

class Wrap
{
     public static void main(String args[])
     {
           float p=Float.parseFloat(args[0]);
           System.out.println("Principle amount is: "+p);

           float r= Float.parseFloat(args[1]);
           System.out.println("rate is: "+r);

           int t=Integer.parseInt(args[2]);
           System.out.println("Enter Time: "+t);

           float SI=(p*r*t)/100;
           System.out.println("Simple Interest is: "+SI);
     }
}
Output 



 





Q.10 WAP to calculate Area of various geometrical figures using the abstract class.

CODE:-
import java.io.*;

abstract class Area
{
    final static float pi=3.14F;
   abstract float compute(float x, float y);
}
class Rectangle extends Area
{
    float compute(float x,float y)
    {
       return(x*y);
    }
}
class Triangle extends Area
{
    float compute(float x,float y)
   {
      return(x*y/2);
   }
}
class Geomatric
{
    public static void main(String args[])throws Exception
    {
           float r,s;
           Rectangle rect=new Rectangle();
           Triangle tri = new Triangle();
BufferedReader br = new BufferedReader(new       InputStreamReader(System.in));
     System.out.println("1. Area of Rectangle   ");
     System.out.println("2. Area of Triangle\n  ");
     System.out.print("Enter your choice    :   ");
     int ch=Integer.parseInt(br.readLine());
     switch(ch)
     {
           case 1:
           {
                System.out.println("Enter the side of Rectangle");
                r=Float.parseFloat(br.readLine());
                s=Float.parseFloat(br.readLine());
System.out.println("Area is  = "+rect.compute(r,s));
                break;                    
           }
           case 2:
           {
System.out.println("Enter the base and height of traingle");
                r=Float.parseFloat(br.readLine());
                s=Float.parseFloat(br.readLine());
System.out.println("Area is  = "+tri.compute(r,s));
                break;
           }   
     }
   }
}

OUTPUT:

 




Q11. Write a program where single class implements more than one interface and with help of interface reference variable user call the method.

CODE:-
import java.io.*;
interface First
{
    void addition(int a,int b);
}

interface Second
{
    void multiplication(int a, int b );
}
class IDemo implements First,Second
{
     public void addition(int a,int b)
     {
           System.out.println("Addition of two number is:  "+(a+b) );
      }

     public void multiplication(int c,int d )
     {
           System.out.println("Addition of two number is:  "+(c*d) );
     }

}
class ID
{
     public static void main(String args[]) throws Exception
     {
           IDemo ii=new IDemo();
           First f;
           Second s;
           BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
           System.out.println("Enter Numbers for Addition and Multiplication");
           System.out.println("Enter First number:");
           int a=Integer.parseInt(br.readLine());
           System.out.println("Enter Second number:");
           int b=Integer.parseInt(br.readLine());
           f=ii;
           f.addition(a,b);
           s=ii;
           s.multiplication(a,b);
     }
}

OUTPUT:-
Program-12

Write a program that uses multiple catch statement with try-catch mechanism.

import java.io.*;
class MultiDemo
{
public static void main(String args[])
{
                int a,b;
                BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
                try
                {
                                System.out.println("****Arithmetic Operation****");
                                System.out.println("Enter First number:" );
                                a=Integer.parseInt(br.readLine());
                                System.out.println("Enter Second number:" );
                                b=Integer.parseInt(br.readLine());
                               
                                System.out.println("Sum of the number is:"+(a+b));
                                System.out.println("Subtraction of the number is:"+(a-b));
                                System.out.println("Multiplication of the number is:"+(a*b));                                                                                                                   
                                System.out.println("Division of the number is:"+(a/b));
                }catch(IOException ioe)
                {
                                System.out.println(ioe);
                }
               
                catch(ArithmeticException ae)
                {
                               
                                System.out.println(ae);
                }
                catch(NumberFormatException ne)
                {
                                System.out.println(ne);
                }
               
}
}


Output:







Q13 Write a Program where user will create a self-Exception using the "throw" keyword.

import java.lang.Exception;
class SelfException extends Exception
{
SelfException(String message)
{
super(message);
}}
class TestSelfException
{
public static void main(String args[])
{
int x=5, y=1000;
try
{
float z=(float)x /(float) y;
if(z<0.01)
{
throw new SelfException("No. is not enlarged");
}}
catch(SelfException e)
{
System.out.println("Caught my exception");
 System.out.println(e.getMessage());
 }
 finally
 {
 System.out.println("we like java");
 } } }

Output:-







Q14. Write a program for multithread using the isAlive(), join(), and synchronized method of thread class.

CODE:-
class CallMe
{
     synchronized void call(String msg)
     {
         System.out.print("["+msg);
         try
           {
              Thread.sleep(100);
           }
           catch(InterruptedException e)
           {
              System.out.println("Interrupted");
           }
           System.out.println("]");
     }
}
class Caller implements Runnable
{
     String msg;
    CallMe target;
    Thread t;
    public Caller(CallMe targ,String s)
     {
           target=targ;
           msg=s;
           t=new Thread(this);
           t.start();
     }
     public void run()
     {
       target.call(msg);
     }
}
class SynchronizeTest
{
  public static void main(String args[])
{
  CallMe target=new CallMe();
  Caller ob1=new Caller(target,"Hi");
  Caller ob2=new Caller(target,"I Am");
  Caller ob3=new Caller(target,"Synchronized");
System.out.println("Thread one is alive:"+ob1.t.isAlive());
 System.out.println("Thread Two is alive:"+ob2.t.isAlive());
 System.out.println("Thread Three is alive:"+ob3.t.isAlive());
  
 try
{
  ob1.t.join();
  ob2.t.join();
  ob3.t.join();
}
catch(InterruptedException ie)
{
  System.out.println("Interrupted");
}
System.out.println("Thread one is alive:"+ob1.t.isAlive());
System.out.println("Thread Two is alive:"+ob2.t.isAlive());
System.out.println("Thread Three is alive:"+ob3.t.isAlive());
}
}

OUTPUT:-







Q15  WAP to create a package using command & one package will import the another package.


import  package1.ClassA;
       import package2.*;
   
       Class PackageTest2
        {
                    Public static void main(String args[] )
                    {    
                     ClassA  objectA = new ClassA();
                     ClassB   objectB= new ClassB();

                      objectA.display();
                      objectB.display();
                      }
          }




Output:-

Class A
Class B
           m = 10







Program-16
Write a program for AWT to create menu and popup menu for Frame.
Code:
import java.awt.*;
import java.awt.event.*;
class MenuDemo extends Frame
{
                MenuBar mbr;
                Menu m1,m2,sm;
                MenuItem mi1,mi2,mi3,mi4,mi5,mi6,mi7,mi8,mi9,mi10,pmi6,pmi7,pmi8,pmi9,pmi10;
                PopupMenu p;
                MenuShortcut msc1;
                MenuDemo()
                {
                                setTitle("Menu");
                                mbr=new MenuBar();
                                setMenuBar(mbr);
                                m1=new Menu("File");
                               
                                msc1=new MenuShortcut('F');
                                mi1=new MenuItem("New",msc1);
                                mi2=new MenuItem("Open");
                                mi3=new MenuItem("Save");
                                mi4=new MenuItem("SaveAs");
                                mi5=new MenuItem("Exit");

                                m1.add(mi1);
                                m1.add(mi2);
                                m1.addSeparator();
                                m1.add(mi3);
                                m1.add(mi4);
                                m1.add(mi5);
                                mbr.add(m1);
                               
                                m2=new Menu("Edit");
                                mi6=new MenuItem("Cut");
                                mi7=new MenuItem("Copy");
                                mi8=new MenuItem("paste");
                                m2.add(mi6);
                                m2.add(mi7);
                                m2.add(mi8);

                                sm=new Menu("Tools");
                                m2.add(sm);
                                mi9=new MenuItem("Undo");
                                mi10=new MenuItem("Redo");
                                sm.add(mi9);
                                sm.add(mi10);
                                mbr.add(m2);

                                p=new PopupMenu("Floating Menu");
                                pmi6=new MenuItem("Cut");
                                pmi7=new MenuItem("Copy");
                                pmi8=new MenuItem("paste");
                                pmi9=new MenuItem("Undo");
                                pmi10=new MenuItem("Redo");
                                p.add(pmi6);
                                p.add(pmi7);
                                p.add(pmi8);
                                p.add(pmi9);
                                p.add(pmi10);
                                add(p);
                                addMouseListener(new MouseAdapter()
                                {
                                public void mousePressed(MouseEvent me)
                                {
                                                display(me);
                                }
                                public void mouseReleased(MouseEvent me)
                                {
                                                display(me);
                                }
                                public void mouseClicked(MouseEvent me)
                                {
                                                display(me);
                                }
                                });

                                setVisible(true);
                                validate();
                                setLocation(100,10);
                                setSize(200,200);
                               
                }
                public void display(MouseEvent me)
                                {
                                if(me.isPopupTrigger())
                                p.show(this,me.getX(),me.getY());
                                }
                public static void main(String agrs[])
                {
                                MenuDemo fr=new MenuDemo();
                }
}
Output:

Z:\jaya>javac menuDemo.java

Z:\jaya>java menuDemo 







Q17 WAP in java for Applet that handle the KeyBoard Event.



import java.awt.*;
import java.awt.event.*;
import java.applet.*;

/*<applet code=prg17.class height=400 width=500>
  </applet>*/

public class prg17 extends Applet implements KeyListener
{
String msg=" ";
int x=30,y=40;

public void init()
{
addKeyListener(this);
requestFocus();
}

public void KeyPressed(KeyEvent ke)
{
showStatus("Key Pressed");
}

public void KeyRealsed(KeyEvent ke)
{
showStatus("Key UP");
}

public void KeyTyped(KeyEvent ke)
{
msg+=ke.getKeyChar();
repaint();
}

public void paint(Graphics g)
{
g.drawString(msg,x,y);
}

}
Output:-
 





                                               PROGRAM-18
Write a program which support the TCP/IP protocol, where client gives the message and server will be, receives the message.
Code:-
// clientdemo.java
import java.net.*;
import java.io.*;

class Clientdemo
{
public static void main(String args[]) throws Exception
{
InetAddress add=InetAddress.getByName("disha-8");
System.out.println("Cnnecting clint is="+add);
Socket s=new Socket(add,9000);
OutputStream os=s.getOutputStream();
PrintWriter pw=new PrintWriter(os);
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
String str=br.readLine();
while(str.length()!=0)
{
pw.println(str);
str=br.readLine();
}
pw.close();
br.close();
isr.close();
s.close();
os.close();
}
}




















//serverdemo.java

import java.net.*;
import java.io.*;


class Serverdemo
{
public static void main(String args[]) throws Exception
{
InetAddress seradd=InetAddress.getLocalHost();
System.out.println("server address is="+seradd);
System.out.println("server is up and waiting for the client");

ServerSocket ss=new ServerSocket(9000);
Socket s1=ss.accept();
System.out.println("Connection is established===");
try{
InputStream is=s1.getInputStream();

InputStreamReader isr1=new InputStreamReader(is);
BufferedReader br1=new BufferedReader(isr1);
String str1=br1.readLine();
while(str1.length()!=0)
{
System.out.println(str1);
str1=br1.readLine();
}


br1.close();
isr1.close();
s1.close();
}
catch(Exception e){}
}
}


Output:-

Z:\vinu\corejava\net>javac serverdemo.java

Z:\vinu\corejava\net>java serverdemo
server address is=Disha-7/10.0.0.7
server is up and waiting for the client
Connection is established===
hai hello.

Z:\vinu\corejava\net>





Z:\vinu\corejava\net>javac clientdemo.java
Z:\vinu\corejava\net>java clientdemo
Cnnecting clint is=Disha-7/10.0.0.7
hai hello.
Z:\vinu\corejava\net>








Q19. Write a Program to illustrate the use of all the method of URL class.

CODE:-
//URL Class
// ParseURL.java

import java.net.*;
import java.io.*;


public class ParseURL
{
    public static void main(String[] args) throws Exception
     {
        URL aURL = new URL("http://java.sun.com:80/docs/books/"
                           + "tutorial/index.html#DOWNLOADING");
        System.out.println("protocol = " + aURL.getProtocol());
        System.out.println("host = " + aURL.getHost());
        System.out.println("filename = " + aURL.getFile());
        System.out.println("port = " + aURL.getPort());
        System.out.println("ref = " + aURL.getRef());
    }
}



OUTPUT:-


E:\Java Prac>javac ParseURL.java

E:\Java Prac>java ParseURL
protocol = http
host = java.sun.com
filename = /docs/books/tutorial/index.html
port = 80
ref = DOWNLOADING
E:\Java Prac>
Q20. Write a program for JDBC to insert the values into the existing table by using prepared statement.

CODE:-

import java.sql.*;
import java.io.*;
class InsertDemo
{
     public static void main(String[] args)
     {
           try
           {
                Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                Connection conn=DriverManager.getConnection("jdbc:odbc:stuDSN");
                PreparedStatement pst=conn.prepareStatement("Insert into student values(?,?,?)");
                BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
                System.out.println("Enter ROll no");
                String a=br.readLine();
                System.out.println("Enter Name");
                String b=br.readLine();
                System.out.println("Enter Marks");
                String c=br.readLine();
                int x=Integer.parseInt(a);
                int y=Integer.parseInt(c);

                pst.setInt(1,x);
                pst.setString(2,b);
                pst.setInt(3,y);
               
                pst.executeUpdate();
                System.out.println("One row inserted");
                conn.close();
                pst.close();
                br.close();

           }catch(ClassNotFoundException cnfe)
           {

           }catch(IOException cnfe)
           {

           } catch(SQLException e)
           {

           }
     }
}

OUTPUT:-

E:\Java Prac>javac InsertDemo.java

E:\Java Prac>java InsertDemo
Enter ROll no
3
Enter Name
mohan
Enter Marks
78
One row inserted

E:\Java Prac>
Q21.Write a program for jdbc to display the records from existing table .

CODE:-
import java.sql.*;
class Show
{
     public static void main(String[] args) throws SQLException
     {
          
           try
           {
                Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
                Connection conn=DriverManager.getConnection("jdbc:odbc:stuDSN");
                Statement st=conn.createStatement();
                String str="Select * from student ";
                ResultSet rs=st.executeQuery(str);
                if(rs.next())
                {
                     while(rs.next())
                     {
                     System.out.print(rs.getInt("rollno")+"\t");
                     System.out.print(rs.getString("Name")+"\t");
                     System.out.print(rs.getInt("marks")+"\n");
                     System.out.println("________________");
                     }
                    

                }
           }catch(ClassNotFoundException cnfe)
           {

           }
     }
}




OUTPUT:-

E:\Java Prac>javac Show.java

E:\Java Prac>java Show
2       disha      88
________________
3       mohan   78
________________
4      ram       66
________________



Q22. Write a Program to demonstrate Border Layout.

CODE:-

import java.awt.*;
import java.awt.event.*;
class BorderDemo extends Frame
{
     public BorderDemo()
     {
           Label lbl1 = new Label("NORTH");
           Label lbl2=new Label("SOUTH");
          
           Button btn1 = new Button("EAST");
           Button btn2=new Button("WEST");
          
           TextArea ta = new TextArea(5,5);
           ta.append("CENTER");
          
           setLayout(new BorderLayout());
           add(lbl1,BorderLayout.NORTH);
           add(lbl2,BorderLayout.SOUTH);
           add(btn1,BorderLayout.EAST);
           add(btn2,BorderLayout.WEST);
           add(ta,BorderLayout.CENTER);
           addWindowListener(new WindowAdapter()
           {
                     public void windowClosing(WindowEvent e)
                     {
                                         System.exit(0);
                           }
                } );
}
 public static void main(String args[])
      {  
                BorderDemo bd = new BorderDemo();
           bd.setTitle("BorderLayout");
           bd.setSize(300,200);
           bd.setVisible(true);
    }
}   
OUTPUT:-
E:\Java Prac>javac BorderDemo.java
E:\Java Prac>java BorderDemo





Q24. WAP for Applet who generate the MouseMotionListener event.

class emp
{
private int empid;
private String name;
public emp( int x,String y)
{
empid=x;
name=y;
}
public void show()
{
System.out.println("empid="+empid);
System.out.println("name="+name);
}
}
class encap
{
public static void main(String arg[])
{
int eid=Integer.parseInt(arg[0]);
String ename=arg[1];
emp e1=new emp(eid,ename);
e1.show();
}
}
Output:-
Q25. Write a program for display chexkBox,labels and TextFields on an AWT.

CODE:-
import java.awt.*;
import java.awt.event.*;

public class AwtFrame
{
     public static void main(String[] args)
     {
    Frame frame=new Frame("Frame");
    Button button = new Button("Button");
    Label label=new Label("Label");
    TextArea txtArea=new TextArea(30,100);
    txtArea.append("This is Text Area");
  
           TextField text=new TextField("TextBox",20);   
           frame.setSize(300,200);
           frame.setLocation(100,100);
           frame.setLayout(new FlowLayout());
           frame.setVisible(true);   
           frame.add(label);
           frame.add(text);
           frame.add(button);
           frame.add(txtArea);
           frame.setVisible(true);

           frame.addWindowListener(new WindowAdapter()
           {
           public void windowClosing(WindowEvent e)
           {
           System.exit(0);
           }
           });
     }
}

OUTPUT:-
E:\Java Prac>javac AwtFrame.java
E:\Java Prac>java AwtFrame
Q 27 WAP for creating a file and to store data into that file (using FileWriterIOStream).

import java.io.*;
public classFileWriter{

            public static void main(String[] args) throws IOException{
                        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
                        System.out.print("Please enter the file name to create : ");
                        String file_name = in.readLine();
                        File file = new File(file_name);
                        boolean exist = file.createNewFile();
                        if (!exist)
                        {
                                    System.out.println("File already exists.");
                                    System.exit(0);
                        }
                        else
                        {
                                    FileWriter fstream = new FileWriter(file_name);
                                    BufferedWriter out = new BufferedWriter(fstream);
                                    out.write(in.readLine());
                                    out.close();
                                    System.out.println("File created successfully.");
                        }}}


Output:-

C:\Suyash>javac CreateFile.java
C:\Suyash>java CreateFile
Please enter the file name to create : nande.txt
This is my name
File created successfully.
Q28 WAP to display your file in DOS console use the IO stream.

import java.io.*;
class display
{
            public static void main(String[] args)
            {
                        FileInputStream file1=null;
                        int b;
                        try
                        {
                                    file1 =new FileInputStream(args[0]);
                                    while((b=file1.read())!=-1)
                                    {
                                                System.out.print((char)b);
                                    }
                                    file1.close();   }
                        catch (IOException ioe)
                        {
                                    System.out.println(ioe);
                        }}}

Output:-



Q29 WAP to create an Applet using HTML file, where Parameter passes for Font size & font type and Applet message will change to corresponding Parameters.


import java.awt.*;
import java.applet.*;

/*<applet code=prg29.class height=300 width=300>
<param name=t1 value="Comic Sans MS">
<param name=t2 value=38>

</applet>*/

public class prg29 extends Applet
{
int n;
String style;
public void init()
{
style=getParameter("t1");
String s=getParameter("t2");
n=Integer.parseInt(s);
Font f=new Font(style,Font.BOLD,n);
setFont(f);
setBackground(Color.red);
setVisible(true);
}
public void paint(Graphics g)
{
g.drawString("disha college",20,100);
}
}

Output:-








---------------------------------------------x----------------------------------------x----------------------------------

Draw lines,rect,oval:
Save as choice.java

import javax.swing.*;
import java.awt.Graphics;
/*
<html>
<body>
<applet code="choice.class"
 width=500 height=500>
</applet>
</body>
</html>
*/
public class choice extends JApplet
{
int i,ch;
public void init()
{
String input;
input=JOptionPane.showInputDialog
("enter your choice( 1-lines,2-rectangles,3-ovals)");
ch=Integer.parseInt(input);
}
public void  paint(Graphics g)
{
switch(ch)
{
case 1:{
for(i=1;i<=10;i++)
{
g.drawLine(10,10,250,10*i);
}
break;
}
case 2:{
for(i=1;i<=10;i++)
{
g.drawRect(10*i,10*i,50+10*i,50+10*i);
}
break;
}
case 3:{
for(i=1;i<=10;i++)
{
g.drawOval(10*i,10*i,50+10*i,50+10*i);
}
break;
}
}
}
}
--------------------------------------------------------------------------

JTable with data enter:
Save as JTableDemo.java

import java.awt.*;
import javax.swing.*;
/* <applet code = "JTableDemo"
 width = 400 height=200> </applet> */
public class JTableDemo extends JApplet {
public void init() {
//Get Content Pane
Container contentPane = getContentPane();
//set layout manger
contentPane.setLayout(new BorderLayout());
//Initialize column headings
final String[] colHeads = { "Name", "Phone", "Fax" };
//Initialize data
final Object[][] data = {
{ "Gail", "4567", "8675" },
{"Keen", "7566", "5555" },
{"Viviane", "5674", "5887"},
{"Anne", "1237", "3333" },
{ "John", "5656", "3144" },
{ "Ellen", "1134", "5335"},
{ "Gail", "4567", "8675" },
{"Keen", "7566", "5555" },
{"Viviane", "5674", "5887"},
{"Anne", "1237", "3333" },
{ "John", "5656", "3144" },
{ "Ellen", "1134", "5335"}
};
//Create the table
JTable table = new JTable(data, colHeads);
//Add table to a scroll pane
int v = ScrollPaneConstants
.VERTICAL_SCROLLBAR_AS_NEEDED ;
int h = ScrollPaneConstants.
HORIZONTAL_SCROLLBAR_AS_NEEDED ;
JScrollPane jsp = new JScrollPane(table, v, h);
// Add scroll pane to the content pane
contentPane.add(jsp, BorderLayout.CENTER);
}
}  
-----------------------------------------------------------------
Abstract class named triagle,hexagon:
Save as AbstractDemo.java

abstract class shape
{
    void numberofsides()
{
   System.out.println("This is for abstract class");
}
}
class Trapezoid extends shape
{
   void numberofsides()
{
System.out.println("It is having 4 sides");
}
}
class Triangle extends shape
{
 void numberofsides()
{
System.out.println("it is having 3 sides");
}
}
class Hexagonal extends shape
{
 void numberofsides()
{
System.out.println("it is having 6 sides");
}
}
class AbstractDemo
{
public static void main(String args[])
{
  Trapezoid tz=new Trapezoid();
Triangle t=new Triangle();
Hexagonal h=new Hexagonal();
tz.numberofsides();
t.numberofsides();
h.numberofsides();
}
}
----------------------------------------------------------------------
Fibonacci

class Rfib
{
int fibo(int n)
{
int a=0,b=1,c=2,i;
if(n==1)
return(a);
else if(n==2)
return(b);
else
{
for(i=3;i<=n;i++)
{
c=a+b;
a=b;
b=c;
}
return(c);
}
}
}
class fib
{
public static void main(String args[])
{
int n,i,a=0,b=1,c;
Rfib f=new Rfib();
n=Integer.parseInt(args[0]);
for(i=1;i<=n;i++)
{
System.out.println(f.fibo(i));
}
for(i=1;i<n;i++)
{
if(i==1)
System.out.println(a);
else if(i==2)
System.out.println(b);
else
{
c=a+b;
a=b;
b=c;
System.out.println(c);
}
}
}
}
-------------------------------------------
Infix into postfix:
Save as InToPost.java

import java.io.*;
class stack
{
char stack1[]=new char[20];
int top;
void push(char ch)
{
top++;
stack1[top]=ch;
}
char pop()
{
char ch;
ch=stack1[top];
top--;
return ch;
}
int pre(char ch)
{
switch(ch)
{
case '-':return 1;
case '+':return 1;
case '*':return 2;
case '/':return 2;
}
return 0;
}
boolean operator(char ch)
{
if(ch=='/'||ch=='*'||ch=='+'||ch=='-')
return true;
else
return false;
}
boolean isAlpha(char ch)
{
if(ch>='a'&&ch<='z'||ch>='0'&&ch=='9')
return true;
else
return false;
}
void postfix(String str)
{
char output[]=new char[str.length()];
char ch;
int p=0,i;
for(i=0;i<str.length();i++)
{
ch=str.charAt(i);         
if(ch=='(')
{
push(ch);
}
else if(isAlpha(ch))
{
output[p++]=ch;
}
else if(operator(ch))
{
if(stack1[top]==0||(pre(ch)>pre
(stack1[top]))||stack1[top]=='(')
{
push(ch);
}
}
else if(pre(ch)<=pre(stack1[top]))
{
output[p++]=pop();
push(ch);
}
else if(ch=='(')
{
while((ch=pop())!='(')
{
output[p++]=ch;
}
}
}
while(top!=0)
{
output[p++]=pop();
}
for(int j=0;j<str.length();j++)
{
System.out.print(output[j]);   
}
}
}
class InToPost
{
public static void main(String[] args)throws Exception
{
String s;
BufferedReader br=new
BufferedReader(new InputStreamReader(System.in));
stack b=new stack();
System.out.println("Enter input string");
s=br.readLine();
System.out.println("Input String:"+s);
System.out.println("Output String:");
b.postfix(s);
}
}
------------------------------------------------------------------------------------------
good morning and welcome

class A extends Thread
{
synchronized public void run()
{
try
{
while(true)
{
sleep(1000);
System.out.println("good morning");
}
}
catch(Exception e)
{         }
}
}
class B extends Thread
{
synchronized public void run()
{
try
{
while(true)
{
sleep(2000);
System.out.println("hello");
}
}
catch(Exception e)
{         }
}
}
class C extends Thread
{
synchronized public void run()
{
try
{
while(true)
{
sleep(3000);
System.out.println("welcome");
}
}
catch(Exception e)
{        }
}
}
class ThreadDemo
{
public static void main(String args[])
{
A t1=new A();
B t2=new B();
C t3=new C();
t1.start();
t2.start();
t3.start();
}
}
--------------------------------------------------------
count words

class Count
{ 
public static void main(String args[])
{    int i,c=0;
for(i=0;i<args.length;i++)
{   System.out.println(args[i]);
c++;
}
System.out.println("number of words="+c);
}
}
-----------------------------------------------------------
file exists r not

import java.io.*;
class FileDemo
{
public static void main(String args[])
{
File f1=new File("/java/copyright","Goutham.java");
System.out.println("file name"+f1.getName());
System.out.println("path"+f1.getPath());
System.out.println("parent"+f1.getParent());
System.out.println(f1.exists());
System.out.println(f1.canRead());
System.out.println(f1.canWrite());
System.out.println(f1.isDirectory());
System.out.println(f1.isFile());
System.out.println(f1.lastModified());
System.out.println(f1.length());
System.out.println(f1.delete());
}
}
--------------------------------------
Calculator:
Save as Cal.java

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="Cal" width=300 height=300>
</applet>
*/
public class Cal extends Applet
implements ActionListener
{
String msg=" ";
int v1,v2,result;
TextField t1;
Button b[]=new Button[10];
Button add,sub,mul,div,clear,mod,EQ;
char OP;
public void init()
{
Color k=new Color(120,89,90);
setBackground(k);
t1=new TextField(10);
GridLayout gl=new GridLayout(4,5);
setLayout(gl);
for(int i=0;i<10;i++)
{
b[i]=new Button(""+i);
}
add=new Button("add");
sub=new Button("sub");
mul=new Button("mul");
div=new Button("div");
mod=new Button("mod");
clear=new Button("clear");
EQ=new Button("EQ");
t1.addActionListener(this);
add(t1);
for(int i=0;i<10;i++)
{
add(b[i]);
}
add(add);
add(sub);
add(mul);
add(div);
add(mod);
add(clear);
add(EQ);
for(int i=0;i<10;i++)
{
b[i].addActionListener(this);
}
add.addActionListener(this);
sub.addActionListener(this);
mul.addActionListener(this);
div.addActionListener(this);
mod.addActionListener(this);
clear.addActionListener(this);
EQ.addActionListener(this);
}
public void actionPerformed(ActionEvent ae)
{
String str=ae.getActionCommand();
char ch=str.charAt(0);
if ( Character.isDigit(ch))
t1.setText(t1.getText()+str);
else
if(str.equals("add"))
{
v1=Integer.parseInt(t1.getText());
OP='+';
t1.setText("");
}
else if(str.equals("sub"))
{
v1=Integer.parseInt(t1.getText());
OP='-';
t1.setText("");
}
else if(str.equals("mul"))
{
v1=Integer.parseInt(t1.getText());
OP='*';
t1.setText("");
}
else if(str.equals("div"))
{
v1=Integer.parseInt(t1.getText());
OP='/';
t1.setText("");
}
else if(str.equals("mod"))
{
v1=Integer.parseInt(t1.getText());
OP='%';
t1.setText("");
}
if(str.equals("EQ"))
{
v2=Integer.parseInt(t1.getText());
if(OP=='+')
result=v1+v2;
else if(OP=='-')
result=v1-v2;
else if(OP=='*')
result=v1*v2;
else if(OP=='/')
result=v1/v2;
else if(OP=='%')
result=v1%v2;
t1.setText(""+result);
}         
if(str.equals("clear"))
{
t1.setText("");
}
}
}
--------------------------------------------------------
sum of integer

import java.io.*;
import java.util.*;
class Sum
{
public static void main(String args[])throws Exception
{
BufferedReader br=new BufferedReader(new
InputStreamReader(System.in));
int a[]=new int[10];
int i,sum=0;
System.out.println("enter integer:\n");
for(i=0;i<10;i++)
{
a[i]=Integer.parseInt(br.readLine());
}
for(i=0;i<10;i++)
{
System.out.println("integers are:"+a[i]);
}
for(i=0;i<10;i++)
{
sum+=a[i];
}
System.out.println("sum is:\n"+sum);
}
}
import java.io.*;
import java.util.*;
class Sum
{
public static void main(String args[])throws Exception
{
BufferedReader br=new BufferedReader(new
InputStreamReader(System.in));
int a[]=new int[10];
int i,sum=0;
System.out.println("enter integer:\n");
for(i=0;i<10;i++)
{
a[i]=Integer.parseInt(br.readLine());
}
for(i=0;i<10;i++)
{
System.out.println("integers are:"+a[i]);
}
for(i=0;i<10;i++)
{
sum+=a[i];
}
System.out.println("sum is:\n"+sum);
}
}
----------------------------------------------------------
applet message

import java.awt.*;
import java.applet.*;
/*<applet code="Hellojava" width=300 height=50>
</applet>*/
public class Hellojava extends Applet
{
public void paint(Graphics g)
{
g.drawString("welcome to Applet",20,20);
}
}
-----------------------------------
Divide:
Save as Div.java

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="Div"width=230 height=250>
</applet>*/
public class Div extends Applet implements ActionListener
{
String msg;
TextField num1,num2,res;Label l1,l2,l3;
Button div;
public void init()
{
l1=new Label("Number 1");
l2=new Label("Number 2");
l3=new Label("result");
num1=new TextField(10);
num2=new TextField(10);
res=new TextField(10);
div=new Button("DIV");
div.addActionListener(this);
add(l1);
add(num1);
add(l2);
add(num2);
add(l3);
add(res);
add(div);
}
public void actionPerformed(ActionEvent ae)
{
String arg=ae.getActionCommand();
if(arg.equals("DIV"))
{
String s1=num1.getText();
String s2=num2.getText();
int num1=Integer.parseInt(s1);
int num2=Integer.parseInt(s2);
if(num2==0)
{
try
{
System.out.println(" ");
}
catch(Exception e)
{
System.out.println("ArithematicException"+e);
}
msg="Arithemetic";
repaint();
}
else if((num1<0)||(num2<0))
{
try
{
System.out.println("");
}
catch(Exception e)
{
System.out.println("NumberFormat"+e);
}
msg="NumberFormat";
repaint();
}
else
{
int num3=num1/num2;
res.setText(String.valueOf(num3));
}
}
}
public void paint(Graphics g)
{
g.drawString(msg,30,70);
}
}                     
---------------------------------------------------
server.java:

import java.net.*;
import java.io.*;
public class  server
{
public static void main(String args[]) throws Exception
{
ServerSocket ss=new ServerSocket(2000);
Socket s=ss.accept();
BufferedReader br=new BufferedReader
(new InputStreamReader(s.getInputStream()));
double rad,area;
String result;
rad=Double.parseDouble(br.readLine());
System.out.println("From Client : "+rad);
area=Math.PI*rad*rad;
result="Area is "+area;           
PrintStream ps=new PrintStream(s.getOutputStream());
ps.println(result);
br.close();
ps.close();
s.close();
ss.close();
}
}
Client.java
import java.net.*;
import java.io.*;
public class  client
{
public static void main(String args[]) throws Exception
{
Socket s=new Socket("localhost",2000);
BufferedReader br=new
BufferedReader(new InputStreamReader(System.in));
String rad;
System.out.println("Enter radius of the circle ");
rad=br.readLine();
PrintStream ps=new PrintStream(s.getOutputStream());
ps.println(rad);
BufferedReader fs=new
BufferedReader(new InputStreamReader
(s.getInputStream()));
String result=fs.readLine();
System.out.println("From Server : "+result);
br.close();
fs.close();        
ps.close();
s.close();
}
}
-------------------------------------------------------------
palindraom

class Palindrom
{
public static void main(String args[])
{
String s=args[0];
int len,i=0,n,c=0,p;
len=s.length();
n=len/2;
p=len-n+1;
while(i<len/2)
{
if(s.charAt [i]==s.charAt(p))
c++;
i++;
p--;
}
if(c==len/2)
{
System.out.println("palindrom");
}
else
{
System.out.println("not palindrom");
}
}
}
---------------------------------------------------------------
sorting

class Sort
{
static String s[]={"goutham","ravi","hari"};
public static void main(String args[])
{
int i,j;
int n=s.length;
String t=null;
for(i=0;i<n;i++)
{
for(j=i+1;j<n;j++)
{
if(s[j].compareTo(s[i])<0)
{
t=s[i];
s[i]=s[j];
s[j]=t;
}     
}
System.out.println(s[i]);
}
}
}
----------------------------------------------------------------------

Signal:
Save as Signal.java

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="Signal" width=300
height=100>
</applet>*/
public class Signal extends
 Applet implements ItemListener
{
Checkbox red,yellow,green;
Light light;
public void init()
{    Panel p1=new Panel();
p1.setSize(200,200);
p1.setLayout(new FlowLayout());
p1.add(light=new Light());
light.setSize(40,90);
Panel p2=new Panel();
p2.setLayout(new FlowLayout());                                
CheckboxGroup g=new
CheckboxGroup();
p2.add(red=new
Checkbox("red",g,false));
p2.add(yellow=new
Checkbox("yellow",g,false));
p2.add(green=new
 Checkbox("green",g,false));
add("center",p1);
add("south",p2);
red.addItemListener(this);
yellow.addItemListener(this);
green.addItemListener(this);
}
public void
itemStateChanged(ItemEvent ie)
{
if(red.getState())
{   
light.red();     }
if(yellow.getState())
{
light.yellow();     }
if(green.getState())
{
light.green();
}
}
class Light extends Canvas
{
private boolean red;
private boolean yellow;
private boolean green;
public Light()
{
red=false;
yellow=false;
green=false;
}
public void red()
{
red=true;
yellow=false;
green=false;
repaint();
}
public void yellow()
{
red=false;
yellow=true;
green=false;
repaint();
}
public void green()
{
red=false;
yellow=false;
green=true;
repaint();
}
public void paint(Graphics g)
{
if(red)
{
g.setColor(Color.red);
g.fillOval(10,10,20,20);
g.setColor(Color.black);
g.drawOval(10,35,20,20);
g.drawOval(10,60,20,20);
g.drawRect(5,5,30,86);
}
else if(yellow)
{
g.setColor(Color.yellow);
g.fillOval(10,35,20,20);
g.setColor(Color.black);
g.drawRect(5,5,30,80);
g.drawOval(10,10,20,20);
g.drawOval(10,60,20,20);
}
else if(green)
{
g.setColor(Color.green);
g.fillOval(10,60,20,20);
g.setColor(Color.black);
g.drawRect(5,5,30,80);
g.drawOval(10,10,20,20);
g.drawOval(10,35,20,20);
}
else{
g.setColor(Color.black);
g.drawRect(5,5,30,80);
g.drawOval(10,10,20,20);
g.drawOval(10,35,20,20);
g.drawOval(10,60,20,20);
}
}
}       
}
--------------------------------------------------
fact using applet

/* <applet code="Fact.java" width=300
height=100>
    </applet> */
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Fact extends Applet
implements ActionListener {
int n,f=1;
Button compute;
TextField t1;
String s1,s2;
public  void init() {
t1=new TextField();
compute = new Button("compute");
add(t1);
add(compute);
t1.setText("0");
compute.addActionListener(this);
}
public void
 actionPerformed(ActionEvent ae)
{
String s=ae.getActionCommand();
if(s.equals("compute"))
{ s1=t1.getText();
  n=Integer.parseInt(s1);
  while(n!=0) {
f*=n;              
n--;
  }
 s2=String.valueOf(f);
}
repaint();
}
public void paint(Graphics g)
{
   g.drawString("factorial:"+s2,6,50);
}
}
-----------------------------------------------
matrix mul

import java.io.*;
class Mmul
{
public static void main
(String args[])throws Exception
{
BufferedReader Br=new BufferedReader(new
InputStreamReader(System.in));
int i=0,j=0,k=0;
int a[][]=new int[10][10];
int b[][]=new int[10][10];
int c[][]=new int[10][10];
System.out.println("enter A matrix");
for(i=0;i<2;i++)
for(j=0;j<2;j++)
a[i][j]=Integer.parseInt(Br.readLine());
System.out.println("enter B matrix");
for(i=0;i<2;i++)
for(j=0;j<2;j++)
b[i][j]=Integer.parseInt(Br.readLine());
System.out.println("c matrix");
for(i=0;i<2;i++)
for(j=0;j<2;j++)
{
c[i][j]=0;
for(k=0;k<2;k++)
c[i][j]+=a[i][k]*b[k][j];
System.out.println(" "+c[i][j]);
}
System.out.println(" ");
}
}
----------------------------------
Evaluate postfix:
Save as EvalPostFix

import java.io.*;
import java.util.*;
class StackDemo
{
 static int index,pos;
  int T;
float stk[];
StackDemo()
{
  stk=new float[10];
T=-1;
index=0;
pos=0;
}
void push(float s)
{
 if(T>=19)
{
 System.out.println("Stack overflow");
System.exit(0);
}else{
 T=T+1;
stk[T]=s;
}
}
float pop()
{
   float num;
if(T==-1)
{
System.out.println("Stack is empty");
return(0);
}
else
{
num=stk[T];
T--;
}
return(num);
}
float ExpEval(char sfix[],float data[])
{
int j=0;
float op1,op2,fs;
char ch;
while(sfix[j]!='\0')
{
 ch=sfix[j];
if(sfix[j]>='a'||sfix[j]>=
'A'&&sfix[j]<='z'||sfix[j]<='Z')
{
  push(data[j]);
}
else
{
 op2=pop();
op1=pop();
switch(ch)
{
  case '+':push(op1+op2);
              break;
case '-':push(op1-op2);
              break;
case '*':push(op1*op2);
              break;
case '/':push(op1/op2);
              break;
case '%':push(op1%op2);
              break;
}
}
j++;
}
fs=pop();
return(fs);
}
}
class EvalPostFix
{
 public static void main(String args[])
{
 String str;
char postfix[]=new char[25];
float number[]=new float[25];
int j=0;
try{
BufferedReader br=new
BufferedReader(new
InputStreamReader(System.in));
System.out.println("Enter a postfix expression:");
str=br.readLine();
str.getChars(0,str.length(),postfix,0);
while(postfix[j]!='\0')
{
if(postfix[j]>='a'||postfix[j]
>='A'&&postfix[j]<='z'||postfix[j]<='Z')
{
  System.out.println("enter a number
for%c:"+postfix[j]);
number[j]=Integer.parseInt(br.readLine());
}
j++;
}
}
catch(Exception e)
{
 System.out.println("Exception \n Read:"+e);
}
StackDemo s1=new StackDemo();
System.out.println("The result
 is "+s1.ExpEval(postfix,number));
}
}
--------------------------------------------------------------------------------
quadratic

class Quad
{
public static void main(String args[])
{
int a,b,c,d;
double x1,x2,re,im;
a=Integer.parseInt(args[0]);
b=Integer.parseInt(args[1]);
c=Integer.parseInt(args[2]);
if(a==0)
{
System.out.println("linear equation");
x1=-c/b;
System.out.println("x1="+x1);
}
else
{
d=b*b-(4*a*c);
if(d==0)
{
System.out.println("real and equal");
x1=-(b/(2*a));
System.out.println("x1=x2="+x1);
}
else
if(d>0)
{
System.out.println("real and unequal");
x1=(-b+Math.sqrt(d))/(2*a);
x2=(-b-Math.sqrt(d))/(2*a);
}
else
{
System.out.println("root are not real solutions");
re=(-b)/(2*a);
im=Math.sqrt(-d)/(2*a);
System.out.println("real="+re);
System.out.println("imaginary="+im);
}
}
}
}
---------------------------------------------------
prime range

class Primeran
{
public static void main(String args[])
{
int num,i=1,j=1,c=0;
num=Integer.parseInt(args[0]);
while(i<=num)
{
j=1;
c=0;
while(j<=i)
{
if(i%j==0)
c++;
j++;
}
if(c==2)
System.out.println(i+"prime");
i++;
}
}
}
----------------------------------------------------------
mouse event

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<applet code="MouseEventDemo
" width=300 height=100>
  </applet>
*/
public class MouseEventDemo
extends Applet
implements MouseListener,
MouseMotionListener
{
String msg=" ";
int mouseX=0,mouseY=0;
public void init()
{
addMouseListener(this);
addMouseMotionListener(this);
}
public void mouseClicked(MouseEvent me)
{
mouseX=0;
mouseY=10;
msg="mouse clicked by me";
repaint();
}
public void mouseEntered(MouseEvent me)
{
mouseX=0;
mouseY=10;
msg="mouse entered by me";
repaint();
}
public void mouseExited(MouseEvent me)
{ 
mouseX=0;
mouseY=10;
msg="mouse exited by me";
repaint();
}
public void mousePressed(MouseEvent me)
{
mouseX=me.getX();
mouseY=me.getY();
msg="Down";
showStatus(msg+"at"+mouseX+","+mouseY);
repaint();
}
public void mouseReleased(MouseEvent me)
{
mouseX=me.getX();
mouseY=me.getY();
msg="Up";
showStatus(msg+"at"+mouseX+" "+mouseY);
repaint();
}
public void mouseDragged(MouseEvent me)
{
mouseX=me.getX();
mouseY=me.getY();
msg="*";
showStatus("Dragging the mouse
at"+mouseX+","+mouseY);
repaint();
}
public void mouseMoved(MouseEvent me)
{
msg="mouse moved";
showStatus("mouse moved
at"+me.getX()+","+me.getY());
repaint();
}
public void paint(Graphics g)
{
g.drawString(msg,mouseX,mouseY);
}
}
--------------------------------------------------------------------------------
consumer

class Q
{
boolean valueSet=false;
int n;
synchronized int get()
{
if(!valueSet)

try
{
wait();
}
catch(InterruptedException e)
{
System.out.println("Exception is:"+e);
}
System.out.println("got:"+n);
notify();
return n;
}
synchronized void put(int n)
{
if(valueSet)
try
{
wait();
}
catch(InterruptedException e)
{
System.out.println
("\n Exception in put:"+e);
}
this.n=n;
valueSet=true;
System.out.println("\nput:"+n);
notify();
}
}
class Producer implements Runnable
{
Q q;
Producer(Q q)
{
this.q=q;
new Thread(this,"Producer").start();
}
public void run()
{
int i=0;
while(true)
q.put(i++);
}
}
class Consumer implements Runnable
{
Q q;
Consumer(Q q)
{
this.q=q;
new Thread(this,"Consumer").start();
}
public void run()
{
while(true)
 q.get();
}
}
class  ProdConsDemo 
{
public static void main(String args[])
{
Q  q=new Q();
new Producer(q);
new Consumer(q);
System.out.println("\n press ctrl+c  to stop");
}
}
------------------------------------------------------------
num of char and lines

import java.io.*;
class FileDemo2
{
public static void main(String args[])throws Exception
{
int i,l=0,w=0;
String s="it is java program";
char buffer[]=new char[s.length()];
s.getChars(0,s.length(),buffer,0);
System.out.println("no of characters="+s.length());
for(i=0;i<s.length();i++)
{      char c=s.charAt(i);
if(c=='\t'||c=='\b'||c==' '||c=='\n')
{    w++;
}
}
System.out.println("no of words:"+w);
FileWriter f1=new FileWriter("c:/goutham.txt");
f1.write(buffer);
f1.close();
FileReader fr=new FileReader("c:/goutham.txt");
BufferedReader br=new BufferedReader(fr);
String t;
while((t=br.readLine())!=null)
{
l++;
}
System.out.println("no of lines"+l);
fr.close();
}
}
--------------------------------------------------------------------------
line num b4re

import java.io.*;
class FileDemo1
{
public static void main(String args[])throws Exception
{
int c=0;
String s="i+ \n is \n java \n program \n";
char buffer[]=new char[s.length()];
s.getChars(0,s.length(),buffer,0);
FileWriter f1=new FileWriter("c:/index.txt");
f1.write(buffer);
f1.close();
FileReader fr=new FileReader("c:/index.txt");
BufferedReader br=new BufferedReader(fr);
String t;
while((t=br.readLine())!=null)
{
c++;
System.out.println(c+t);
}
fr.close();
}
}
------------------------------------------------------------------------
stack adt

interface IntStack {
void push(int item);
int pop();
}
class FixedStack implements IntStack {
private int st[ ];
private int top;
FixedStack(int s) {
st=new int[s];
top=-1;
}
public void push(int item) {
if(top==st.length-1)
System.out.println("stack is full");
else
st[++top]=item;
}
public int pop() {
if(st.length<0) {
System.out.println("stack is empty");
return 0;
}
else
return st[top--];                       
}
}
class IFTest
{
public static void main(String args[ ])
{         
FixedStack s1=new FixedStack(5);
FixedStack s2=new FixedStack(8);
int i;
for(i=0;i<5;i++)
s1.push(i);
for(i=0;i<8;i++)
s2.push(i);
System.out.println("stack in  s1");
for(i=0;i<5;i++)
System.out.println(s1.pop());
System.out.println("stack in s2");
for(i=0;i<8;i++)
System.out.println(s2.pop());
}
}

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