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Create an applet which takes number from text field and validates it

Submitted by Rahimv on Mon, 08/23/2010 - 17:10

/*-*-*-*-*-*-*-*-*--*-*-*-*-*--*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
Create an applet which takes number from text field and on clicking button labelled
"read" checks whether the number is in range of 0 to 100 or not. If not it should
throw customized exception "Out of Range...". If exception is thrown, put message
"Enter Number within range 0 to 100" in text field.
-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*--*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*/
 
import java.applet.Applet;
import java.awt.Button;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
/*  <applet code = "CheckNumber" width= 400 height = 400>
 </applet>
*/
 
public class CheckNumber extends Applet implements ActionListener
{
 TextField t1;
 Button b1;
 public void init()
 {
  t1 = new TextField(50);
  add(t1);
  b1 = new Button("Read");
  add(b1);
  b1.addActionListener(this);
 }
 public void actionPerformed(ActionEvent e)
 {
  if(e.getSource() == b1)
  {
   try
   {
    check(Integer.parseInt(t1.getText()));
    t1.setText(t1.getText() + " OK...");
   }
   catch(NoOutOfRange ex)
   {
    t1.setText("Enter number bewteen 0 to 100...");
   }
   catch(Exception ex)
   { 
    t1.setText("Invalid Number");
   }
  }
 }
 static void check(int val) throws NoOutOfRange
 {
  if(val < 0 || val > 100)
  {
   throw new NoOutOfRange("Range");
  }
 }
}
 
class NoOutOfRange extends Exception
{
 String msg;
 NoOutOfRange(String s)
 {
  msg = s;
 }
 public String toString()
 {
  return("No. Out Of Range : " + msg );
 }
}