java程序设计教程(第六版)课后习题答案(16)

private static final long serialVersionUID = 8617749572451960356L; private int count;

private JButton push;

private JLabel label;

int num;

int I=100;

public PushDisplayPanel()

{

push=new JButton("Push it!");

push.addActionListener(new ButtonListener());

label=new JLabel("Random:"+count);

add (push);

add (label);

setPreferredSize(new Dimension(400,100));

setBackground(Color.pink);

}

private class ButtonListener implements ActionListener {

public void actionPerformed(ActionEvent event)

{

for(int j=0;j<I;j++){

num=(int)(Math.random()*100)+1;

label.setText("Random:"+num);

}

}

}

}

//Random.java

import javax.swing.JFrame;

public class Random {

public static void main(String[] args) {

JFrame frame=new JFrame("Random");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(new PushDisplayPanel());

frame.pack();

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