Practice Programs

                               checkbox example import java.applet.*; import java.awt.*; import java.awt.event.*; /*             <applet code="CheckDemo" height=200 width=200>             </applet> */ public class CheckDemo extends Applet implements ItemListener {             Label lbl;             public void init() {                         Checkbox ch1=new Checkbox("Red");                         add(ch1);   ...

                Checkbox example in awt import java.applet.*; import java.awt.*; import java.awt.event.*; /*             <applet code="CheckDemo" height=200 width=200>             </applet> */ public class CheckDemo extends Applet implements ItemListener {             Label lbl;             public void init() {                         Checkbox ch1=new Checkbox("Red");                         add(ch1);           ...

control and method of checkbox in awt Checkbox class:             This class is used to create the check box control. This will create a small box and label in front of it. If we click in the box the check mark will appear in it. The Constructors of the Checkbox control: a) Checkbox()                         It will create the Checkbox with no Label information with it. b) Checkbox(String s)                         It will create the Checkbox with string s containing the information to be displayed in the label in front of the check box c) Checkbox(String s,boolean state,CheckboxGroup cg)                 ...

                     button class example import java.awt.*; import java.applet.*; import java.awt.event.*; /* <applet code="ButtonDemo3" height=200 width=200> </applet> */ public class ButtonDemo3 extends Applet implements ActionListener {             Button b1,b2;             Label msg; public void init()             {                         msg=new Label("                                           ...

         user define Exception handling import java.lang.Exception;  import java.lang.*; import java.lang.Exception;  import java.io.DataInputStream; class MyException extends Exception { MyException(String message) { super(message); } } class userdef { public static void main(String a[]) { int age; DataInputStream ds=new DataInputStream(System.in);  try { System.out.println("Enter the age (above 15 abd below 25) :"); age=Integer.parseInt(ds. readLine()); if(age<15 || age> 25) { throw new MyException("Number not in range"); } System.out.println(" the number is :" +age); } catch(MyException e) { System.out.println("Caught MyException"); System.out.println(e. getMessage()); } catch(Exception e){ System.out.println(e); } } }