jbuttontest.java

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JbuttonTest extends JApplet implements ActionListener
{
   Container ctp=getContentPane();
   ImageIcon icon1=new ImageIcon("a.gif"),
    icon2=new ImageIcon("b.gif"),
    icon3=new ImageIcon("c.gif"),
    icon4=new ImageIcon("d.gif");
    JLabel lb1=new JLabel("第一个数:",icon1,JLabel.CENTER),
    lb2=new JLabel("第二个数:",icon2,JLabel.CENTER),
	  lb3=new JLabel("和:",icon3,JLabel.CENTER);
    JTextField tf1=new JTextField(8),
    tf2=new JTextField(8),
	  tf3=new JTextField(15);
    JButton bt=new JButton(icon4);
    public void init()
    {
      ctp.setLayout(new FlowLayout());
      ctp.add(lb1);
      ctp.add(tf1);
      ctp.add(lb2);
      ctp.add(tf2);
      ctp.add(lb3);
      ctp.add(tf3);
      ctp.add(bt);
      bt.setRolloverIcon(icon1);
      bt.setPressedIcon(icon2);
      bt.addActionListener(this);
    }
    public void actionPerformed(ActionEvent e)
    {
      int x,y,z;
      x=Integer.parseInt(tf1.getText());
      y=Integer.parseInt(tf2.getText());
      z=x+y;
      tf3.setText(String.valueOf(z));
    }
}