program to catch ARITHMATIC EXCEPTION and ARRAYINDEXOUTBONDS EXCEPTION that is demostartion of used of mulitple catch in java

class MultiCatch
{
   
    public static void main(String args[])
     {
        try
        {
          int a = args.length;
          System.out.println("a = " + a);
          int b = 42 / a;
          int c[] = { 1 };
          c[42] = 99;
            }

program to design applet with two Text boxes and a Button.If both Text boxes contain a Number then add two numbers. If both contain String then concate otherwise raise user defined Exception in java.

import java.awt.event.*;
import java..*;
import java.awt.*;
import java.io.*;
/*
<applet code="Exception" width=700 height=300>
</>
*/
public class Exception extends Applet implements ActionListener
{
  String msg=" ",msg1=" ",sum=" ",con=" ";
  String str3;
  Button  Press;
  TextField  T1,T2;
  int n1,n2,ans;
 
    public void init()
     {
       setFont(new Font("Times New Roman",Font.PLAIN,15));
        
       Label  L1=new Label("Enter No. Or String : ",Label.RIGHT);
       T1=new TextField(15);
       Label  L2=new Label("Enter No. Or String : ",Label.RIGHT);
       T2=new TextField(15);
       Press=new Button("ADD/CONCATE");
        
       add(L1);
       add(T1);
       add(L2);
       add(T2);
       add(Press);
       
       T1.addActionListener(this);
       T2.addActionListener(this);
       Press.addActionListener(this);
     }
    public void start()
     {
       msg="NO STRINGS ARE ENTERED....";
       msg1="NO NUMBERS ARE FOUND.....";
     }
       
    public void actionPerformed(ActionEvent ae)
     {

       String s1=ae.getActionCommand();
       String s2=ae.getActionCommand();
       s1=T1.getText();
       s1=s1.trim();
       s2=T2.getText();
       s2=s2.trim();

       try
       {
         n1=Integer.parseInt(s1);
         n2=Integer.parseInt(s2);

         ans=n1+n2;
         con="RESULT FOR CONCATATION";
         sum="RESULT FOR ADDITION";
         msg="THIS TIME ADDITION IS PERFORMED....";
         msg1="YOUR SUM OF ENTERED NO.IS  :  "+ans;
         repaint();
 
       }catch(NumberFormatException nf)

program to demostrate used of FileInputStream and FileOutputStream to copy file in java.

import java.io.*;

class CopyFile {
  public static void main(String args[])
    throws IOException
  {
    int i;
    FileInputStream fin;
    FileOutputStream fout;

    try {
      // open input file
      try {
        fin = new FileInputStream(args[0]);
      } catch(FileNotFoundException e) {
        System.out.println("Input File Not Found");
        return;
      }

      // open output file
      try {
        fout = new FileOutputStream(args[1]);
      } catch(FileNotFoundException e) {
        System.out.println("Error Opening Output File");
        return;
      }
    } catch(ArrayIndexOutOfBoundsException e) {
      System.out.println("Usage: CopyFile From To");
      return;
    }

    // Copy File
    try {
      do {
        i = fin.read();
        if(i != -1) fout.write(i);
      } while(i != -1);
    } catch(IOException e) {
      System.out.println("File Error");
    }

    fin.close();
    fout.close();
  }
}

program to create a two level card deck that allows a user to select an operating system where windows based operating systems are displayed in one card and other programming operating system in other card in java.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
 /*
  <applet code="clayout" width=300 height=100>
  </applet>
 */
  public class clayout extends Applet implements ActionListener,MouseListener
{
  Checkbox Win98,winNT,solaris,mac;
  Panel osCards;
  CardLayout cardLO;
  Button Win,Other;

  public void init()
  {
    Win = new Button("Windows");
    Other = new Button("Other");
    add(Win);
    add(Other);
    cardLO = new CardLayout();
    osCards = new Panel();
    osCards.setLayout(cardLO); //set panel layout to card layout
    Win98 = new Checkbox("Windows 98/xp",null,true);
    winNT = new Checkbox("Windows NT/2000");
    solaris = new Checkbox("Solaris");
    mac = new Checkbox("MacOS");

program to demostrate used of TextField and TextArea within applet.

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

/* <applet code="texts" width=200 height=300>
   </applet>
*/

public class texts extends Applet
{
      public void init()
      {
            add(new TextField("Sample String ",20));
            setFont(new Font("Times Roman ",Font.ITALIC,8));
            add(new TextField("Hello Word"));
            setFont(new Font("Helvetica ",Font.BOLD,18));
            add(new TextArea("Scratch Pad on Ice ",5,20));
      }
}

program that demostrate GridBagLayout using applet.

import java.awt.*;

/* <applet code = "gridbag" width=200 height=300 >
   </applet>
*/

public class gridbag extends java.applet.Applet
{
      public static void addComponent(Container container,Component component,int gridx,int gridy,int gridwidth,int gridheight,int fill,int anchor) throws AWTException
      {
            LayoutManager lm = container.getLayout();
            if(!(lm instanceof GridBagLayout))
            {
                  throw new AWTException("Invalid Layout"+lm);
            }
            else
            {

program that demostrate example of simple menu using applet.

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
/* <applet code="simplemenu" height=300 width=200>
   </applet>
*/
public class simplemenu extends Frame
{
      simplemenu()
      {
            super("Menu Example");
            Menu m = new Menu("File",true);
            m.add(new MenuItem("New Web Browser ",new MenuShortcut('n')));
            m.add(new MenuItem("New Mail Message ",new MenuShortcut('n',true)));
            m.add(new MenuItem("New Folder"));
            m.addSeparator();
            m.add(new MenuItem("Close"));
            m.add(new MenuItem("Quit"));
           
            MenuBar mb = new MenuBar();
            mb.add(m);
            setMenuBar(mb);
            resize(200,200);
       }
       public static void main(String args[])
       {
             simplemenu f = new simplemenu();
             f.show();
       }
}
      

program to demostrate used of choice box using applet.

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

/* <applet code="choicebox" width=200 height=300 >
   </applet>
*/

public class choicebox extends Applet
{
      public void init()
      {
            String [] fonts;
            fonts = Toolkit.getDefaultToolkit().getFontList();

            Choice c = new Choice();           
            Choice b = new Choice();
           
            for ( int i=1 ; i<fonts.length ; i++)
            {
                  c.addItem(fonts[i]);
                  b.addItem(fonts[i]);
            }
            add(c);
            add(b);
       }
}

program to display banner using applet.

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

/* <applet code="banner" width=300 height=200>
   </applet> */

 public class banner extends Applet implements Runnable 
   {
     Font f;
    String mgs="welcome to applet programming language...";
    Thread t=null;
    int state;
    boolean stopflag;

program that performed various operation +,-,*,/ (calculator type) using applet.

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

/* <applet code = "appcalc" width=100 height=200 >
   </applet> */

public class appcalc extends Applet implements ActionListener
  {
   TextField no1,no2,op;
   int ino1,ino2;
   float result=0.0f;

program that display child Frame Window within an parent in applet.

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

/*

<applet code="AppletFrame" width=300 height=50>

</applet>

*/

// Create a subclass of Frame

class SampleFrame extends Frame {

SampleFrame(String title) {

super(title);

// Create an object to handle window events

 MyWindowAdapter adapter = new MyWindowAdapter(this);

 // register it to receive those events

 addWindowListener(adapter);

 }

 public void paint(Graphics g) {

 g.drawString("This is in Frmae Window", 10, 40);

 } }

java program that demostrate use of static method and static variable.

class staticdemo
{
    static int a =42;
    static int b = 99;
    static void callme()
        {
        System.out.println("A = "+a);
        }
}
class static_example
{
    public static void main(String args[])
        {
            final int d =1987;
            System.out.println("final d= "+d);
            //CALL STATIC METHOD
        staticdemo.callme();
        System.out.println("B ="+staticdemo.b);
        }
}

java program that demostrate the key event handlers.

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

 /*
  <applet code="SimpleKey" width=300 height=100>
  </applet>
 */
 public class SimpleKey extends Applet
 implements KeyListener {
  String msg="";
 int X=10, Y=20; // output coordinates
 public void init() {
 addKeyListener(this);
 requestFocus(); //request input focus
 }
 public void keyPressed(KeyEvent ke) {
 showStatus("Key Down");
 }

java program that performed pattern matching in input string.

import java.io.*;

class paturn_match
{
       public static void main(String args[]) throws IOException
       {
             BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
             char test[] = new char[100];
             char given_str[] = new char[15];
             String temp;
             int i,j,lentext,lenp,flag=0,count=0;
            
             System.out.print("Enter Text  =  ");
             temp = br.readLine();
             test = temp.toCharArray();
             lentext = temp.length();
            
             System.out.print("Enter Paturn  =  ");
             temp = br.readLine();
             given_str = temp.toCharArray();
             lenp = temp.length();

             for(i=0;i!=lentext-1;i++)
             {
                   j=i;
                   int k=0;
                   flag=0;
                         while((test[i] == given_str[k]) && (flag !=1))
                         {
                               j=j+1;
                               k=k+1;
                                    if(k>=(lenp-1))
                                    {
                                          flag=1;
                                          break;
                                    }
                         } //WHILE
                        
                         if((k>0) && (flag==1))
                         {
                               System.out.println(" Paturn found at  " + i);
                               count++;
                         }
            }  // FOR LOOP
           
            System.out.println(" count = " + count);
    }
} //paturn_match.java

java program that take input of student details and subject marks and generate marksheet(result) for student.

import java.io.*;
class marks
    {
        int sub1,sub2,sub3,sub4,sub5,sub6,tot;
        float percentage;
        String stud_name,sid,g;
        public marks(String stud_name,String sid,int sub1,int sub2,int sub3,int sub4,int sub5,int sub6,int tot,float percentage)
            {
                this.stud_name=stud_name;
                this.sid=sid;
                this.sub1=sub1;
                this.sub2=sub2;
                this.sub3=sub3;   
                this.sub4=sub4;
                this.sub5=sub5;
                this.sub6=sub6;
                this.tot=tot;
                this.percentage=percentage;
            }

java program to create Thread by using Runnable interface

// controlling the main thread
class mynewthread implements Runnable
{
  
      Thread t;
      mynewthread()
      {
         // create new thread
         t= new Thread(this,"demo thread");
         System.out.println("child thread :"+t);
         t.start();
      }
      public void run()
       {
         try
         {

java program to display star using applet.

import java.awt.*;

/* <applet code ="star" height=300 width=200>
   </applet>
*/

public class star extends java.applet.Applet
{
      public void paint(Graphics g)
      {
            g.setFont ( new Font ("Helvetica",Font.BOLD,20));
            g.drawString("HI",112,112);
            g.setColor(Color.red);
            g.drawLine(50,75,200,75);
        

java program to display and performed operation on scroll bar using applet.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/* <applet code = "scroll" height=150 width=150>
   </applet>
*/

public class scroll extends Applet implements ActionListener,ContainerListener
{
      ScrollPane sp = new ScrollPane(ScrollPane.SCROLLBARS_ALWAYS);
      public void init()
      {
        

java program to display paint brush that is to display current mouse coursor that is used of varoius method of MouseLIstener and MouseMotionListerner interface using applet

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
<applet code="paintbrush" width=500 height=400>
</applet>
*/
public class paintbrush extends Applet implements MouseListener,MouseMotionListener
{
String msg=" ";
int mouseX,  mouseY,x,y,a,b,x1,y1;
public void init()
{
addMouseListener(this);
addMouseMotionListener(this);
}

java program to display list box using applet.

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

/*<applet code = "listbox" width=200 height=300>
   </applet>
*/

public class listbox extends Applet
{
      public void init()
      {