import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Java_3 {
public static void main(String[ ] args) {
JFrame frame = new JFrame("Demo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//*********Found**********
frame.getContentPane().add(new Change());
frame.pack();
//*********Found**********
frame.setVisible(true);
}
}
class Change extends JPanel{
int count = 200;
JLabel l1;
JButton b1, b2;
public Change() {
setPreferredSize(new Dimension(280, 60));
l1 = new JLabel("200");
b1 = new JButton("增大");
b2 = new JButton("减小");
add(l1);
add(b1);
add(b2);
b1.addActionListener(new BListener1());
//*********Found**********
b2.addActionListener(new BListener2());
}
private class BListener1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
count++;
l1.setText("" + count);
}
}
private class BListener2 implements ActionListener {
public void actionPerformed(ActionEvent e) {
//*********Found**********
count --;
l1.setText("" + count);
}
}
}