Java program to illustrate menubar with the help of applet

import java.applet.*; import java.awt.*;  class mymenu extends Frame {             MenuBar mb;             Menu filemenu,editmenu,viewmenu;             MenuItem open,newmi,save,cut,copy;             CheckboxMenuItem toolbar,layer; public mymenu() {             mb=new MenuBar();             setMenuBar(mb);                         filemenu=new Menu("File");             editmenu=new Menu("Edit");             viewmenu=new Menu("View");             open=new MenuItem("Open");             newmi=new MenuItem("New");             save=new MenuItem("Save");             cut=new MenuItem("Cut");             copy=new MenuItem("Copy");             toolbar=new CheckboxMenuItem("Toolbar",true);             layer=new CheckboxMenuItem("Layer Window",false);             filemenu.add(open);             filemenu.add(newmi);             filemenu.add(save);             editmenu.add(cut);             editmenu.add(copy);             viewmenu.add(toolbar);             viewmenu.add(layer);             mb.add(filemenu);             mb.add(editmenu);             mb.add(viewmenu); } public static void main(String s[]) {             mymenu mn=new mymenu();              mn.setSize(new Dimension(500,500));             mn.setTitle("Menu Bar");             mn.setVisible(true); } } Output

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Java program to create login form using applet

import java.awt.*; import java.awt.event.*; import java.applet.*; public class Loginform extends Frame implements ActionListener { Label l1=new Label("user name");   Label l2=new Label("password");   Label l3=new Label(" ");   TextField t1=new TextField();   TextField t2=new TextField();   Button b= new Button("Submit");   public Loginform()   { add(l1);     add(t1);     add(l2);     add(t2);     add(b);     add(l3);     l1.setBounds(20,45,70,20);     t1.setBounds(180,45,200,20);     l2.setBounds(20,95,70,20);     t2.setBounds(180,95,200,20);     b.setBounds(310,145,70,20);     b.addActionListener(this);     t2.setEchoChar('*');     addWindowListener(new mwa());   }   public void actionPerformed(ActionEvent e)   { l3.setText("Welcome "+t1.getText());}   public static void main(String s[])   { Loginform l=new Loginform();     l.setSize(new Dimension(600,600));     l.setTitle("Login");     l.setVisible(true);   } } class mwa extends WindowAdapter { public mwa(){}   public void windowClosing(WindowEvent e)   { System.exit(0);   } } Output

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Java program to print fibonacci series upto a given number

import java.io.*; class Fibonacci { int next,curr,prev,num;             Fibonacci(int a)   { next=1;      curr=1;     prev=0;     num=a;  }   void calc()   { while(prev<=num)     { System.out.println(prev);       prev=curr;       curr=next;       next=prev+curr;  }   }   public static void main(String s[])throws IOException   { BufferedReader br=new BufferedReader(new InputStreamReader(System.in));     System.out.println("Enter the limit");     int a=Integer.parseInt(br.readLine());     Fibonacci f=new Fibonacci(a);     f.calc(); } } Output

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Java program to illustrate exception handling

import java.lang.ArithmeticException; import java.util.*;                                //import util package public class ExceptionDemo {  public static void main(String s[])   {   Scanner b1=new Scanner(System.in);     try      {  System.out.println("Enter the Divident?");         double a=b1.nextDouble();         System.out.println("Enter the Divisor?");         double b=b1.nextDouble();       if(b==0)   //Throwing an Exception using throw        throw new ArithmeticException("Division by zero!");        double res=a/b;        System.out.println("Result of"+a+"/"+b+"is"+res);      }   //Handles input mismatch exception caused by  //entering a non-integer value at th point   catch(InputMismatchException e)        {  System.out.println("Error:"+e);} //Handles the divide-by-zero ArithmeticException   catch(ArithmeticException ae)       {  System.out.println("Error:"+ae);}    } } Output

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Java program to find distance between two points in a plane

import java.io.*; class distance {             int x,y,dist;             distance()              {  x=0;               y=0;  }   void calc(distance c,distance d)   {      int xd=c.x-d.x;      int xs=xd*xd;      int yd=c.y-d.y;      int ys=yd*yd;      int sum=xs+ys;      double dist=Math.sqrt(sum);      System.out.println("The distance is "+dist);   }   void read()throws IOException   {      BufferedReader br=new BufferedReader(new InputStreamReader(System.in));      System.out.println("Enter the x coordinate");      x=Integer.parseInt(br.readLine());      System.out.println("Enter the y coordinate");      y=Integer.parseInt(br.readLine());      System.out.println("The entered point is "+"("+x+","+y+")");   }   public static void main(String s[])throws IOException   {      distance c=new distance();      distance d=new distance();      System.out.println("First point");      c.read();      System.out.println("Second point");      d.read();      d.calc(c,d);   } } Output

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Java program to perform complex number addition

import java.io.*; class complex {    int r,i;    complex() {    r =0;    i=0; }   void sum(complex c,complex d) { complex a=new complex(); a.r=c.r+d.r; a.i=c.i+d.i;      System.out.println("The sum is "+a.r+"+"+a.i+"i");   }   void read()throws IOException   {  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));   System.out.println("\nEnter the real part");    r=Integer.parseInt(br.readLine());   System.out.println("\nEnter the imaginary part");     i=Integer.parseInt(br.readLine());   System.out.println("\nYou have entered : "+r+"+"+i+"i");   }   public static void main(String s[])throws IOException   {       complex c=new complex();      complex d=new complex();      System.out.println("First number");      c.read();      System.out.println("\nSecond number");      d.read();      d.sum(c,d);   } } Output

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