Question

java button 实现暂停 继续的功能

在java程序中添加了一个button
用于暂停线程、继续线程的，点击button的时候
暂停，再点击一次，继续

做了，但是没有预期的效果，求java高手，帮忙解决，谢谢，

请hi我

Answer 1

很简单，我给你写一个Demo：

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

public class Demo extends Thread {
private JFrame frm = new JFrame("Demo");
private JButton btnPause = new JButton("Pause");
private JLabel lblTest = new JLabel("0");
private boolean isPaused = false;
private int seconds = 0;

public void run () {
while (true) {
while (isPaused);
seconds ++;
lblTest.setText(seconds + "");
try {
sleep(200);
} catch (InterruptedException ie) {}
}
}

public Demo () {
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setResizable(false);
frm.setLayout(null);
frm.setSize(150, 200);
frm.setLocationRelativeTo(null);

lblTest.setBounds(20, 50, 100, 25);

btnPause.setBounds(20, 120, 100, 30);
btnPause.addActionListener(new ActionListener() {
public void actionPerformed (ActionEvent ae) {
if (isPaused) {
btnPause.setText("Pause");
isPaused = false;
} else {
btnPause.setText("Resume");
isPaused = true;
}
}
});

frm.add(lblTest);
frm.add(btnPause);
frm.setVisible(true);
start();
}

public static void main (String args[]) {
new Demo();
}
}