Java Examples - Swing applet in JAVA?

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Problem Description:

How to use swing applet in JAVA?

Solution:

Following example demonstrates how to go use Swing Applet in JAVA by implementing ActionListener & by creating JLabels.

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

public class SApplet extends Applet implements ActionListener {
   TextField input,output;
   Label label1,label2;
   Button b1;
   JLabel lbl;
   int num, sum = 0;
   public void init(){
      label1 = new Label("please enter number : ");
      add(label1);
      label1.setBackground(Color.yellow);
      label1.setForeground(Color.magenta);
      input = new TextField(5);
      add(input);
      label2 = new Label("Sum : ");
      add(label2);
      label2.setBackground(Color.yellow);
      label2.setForeground(Color.magenta);
      output = new TextField(20);
      add(output);
      b1 = new Button("Add");
      add(b1);
      b1.addActionListener(this);
      lbl = new JLabel("Swing Applet Example. ");
      add(lbl);
      setBackground(Color.yellow);
   }
   public void actionPerformed(ActionEvent ae){
      try{
         num = Integer.parseInt(input.getText());
         sum = sum+num;
         input.setText("");
         output.setText(Integer.toString(sum));
         lbl.setForeground(Color.blue);
         lbl.setText("Output of the second Text Box : " 
         + output.getText());
      }
      catch(NumberFormatException e){
         lbl.setForeground(Color.red);
         lbl.setText("Invalid Entry!");
      }
   }  
}

Result:

The above code sample will produce the following result in a java enabled web browser.

View in Browser. 


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