Java:线程不会等待

时间:2013-11-09 22:33:11

标签: java multithreading wait notify

我一直试图让这个线程等待,但它不会等待或抛出异常或做任何事情......(我创建了一个新线程来运行线程,因为否则我的gui因为调用wait方法而冻结edt)

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;

public class Sandbox extends JFrame {

boolean paused = false;
Thread thread = new Thread() {
    public void run() {
        while(true) {
            System.out.println("running...");
        }
    }
};

private JButton button;
public Sandbox() throws Exception {
    thread.start();
    setSize(300, 150);
    setLocationRelativeTo(null);
    setDefaultCloseOperation(3);
    add(button = new JButton("Pause"));
    button.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
        new Thread() {
            public void run() {
                synchronized(thread) {  
                    try {
                        if(button.getText().equals("Pause")) {
                            thread.wait();
                            button.setText("Resume");

                        } else if(button.getText().equals("Resume")) {
                            thread.notify();
                            button.setText("Pause");
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }});
    setVisible(true);
}

public static void main(String[] args) throws Exception {
    new Sandbox();
}
}

1 个答案:

答案 0 :(得分:1)

如果您要比较字符串,则需要使用equals()而不是==

if(button.getText().equals("Pause")) {
    thread.wait();
    button.setText("Resume");

} else if(button.getText().equals("Resume")) {
    thread.notify();
    button.setText("Pause");
}

但是使用wait和notify可能不会真正做你想要的。