Simple Calculator Using Applet

import java.applet.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.TextEvent; import java.awt.event.TextListener;; public class calculator extends Applet implements ActionListener, TextListener { String s,s1,s2,s3,s4; Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b0; Button add,sub,eq,cl,mul,div; TextField t1; int a,b,c; public void init() { t1=new TextField(10); b1=new Button("1"); b2=new Button("2"); b3=new Button("3"); b4=new Button("4"); b5=new Button("5"); b6=new Button("6"); b7=new Button("7"); b8=new Button("8"); b9=new Button("9"); b0=new Button("0"); add=new Button("+"); sub=new Button("-"); mul=new Button("*"); div=new Button("/"); eq=new Button("="); cl=new Button("Clear"); GridLayout gb=new GridLayout(4,5); setLayout(gb);

CheckBox Demonstration

package GuIBasedProgram; import java.applet.*; import java.awt.*; import java.awt.event.*; public class Boxes extends Applet implements ActionListener {     Button b1;     Checkbox name1;     Checkbox name2;     public void init()     {         name1=new Checkbox("Red",null,false);         name2=new Checkbox("Blue",null,false);         b1=new Button("Submit");         add(name1);         add(name2);         add(b1);         b1.addActionListener(this);     }