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通过运用多线程来异步控制程序的运行

2024-07-05 03:45:39   230人阅读

background:

又一个持续运行的程序，不断产生数据，而在主程序中不仅需要监控所产生的程序，同时还要能控制其运行状态。

solution：

不断产生数据的为一个线程，为达到需求，增加两个线程，其中辅线程用来不断监视产生数据线程的数据，而主线程则用来控制辅线程的运行与否（即是否监视）。

一共涉及三个类，主控制类JController、辅线程Producer、数据线程Counter.代码如下所示：

1.JController

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import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
 
import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JSplitPane;
import javax.swing.JToolBar;
public class JController  extends JFrame{
     
 
    Counter count = new Counter();
    Producer produce = new Producer(count);
    public JController()
    {
        super();
        setTitle("JFileChooserTest");
        setBounds(100,100,350,150);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         
        final JButton button = new JButton();
        JButton button2 = new JButton("button2");
         
        count.start();
         
        final JLabel label = new JLabel();
        button.addActionListener(new ActionListener(){  //监听事件
            public void actionPerformed(ActionEvent e){
                boolean isAlive = produce.isAlive();
                if(isAlive){
                     
                }else{
                    produce = new Producer(count);
                    produce.start();
                }
             
            }
        });
         
        button2.addActionListener(new ActionListener(){  //监听事件
            public void actionPerformed(ActionEvent e){
              produce.stopRunning();
            }
        });
        getContentPane().add(button,BorderLayout.NORTH);  //布局处理
        getContentPane().add(button2,BorderLayout.CENTER);
        button.setText("button1");
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        JController jFileChooserTest = new JController();
        jFileChooserTest.setVisible(true);
    }
 
}

　　2.Producer

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public class Producer extends Thread{
     
    volatile boolean stopRequest = false;
    Counter count = new Counter();
     
    public Producer(Counter count){
        this.count = count;
    }
     
    @Override
    public void run(){
        while(!stopRequest){
            try {
                Thread.sleep(800);
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                System.out.println(e.toString());
            }
            System.out.println(count.getCount());
        }
    }
    public void stopRunning(){
        stopRequest = true;
    }
     
    public static void main(String[] args){
    }
}

　　3.Counter

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import java.io.IOException;
 
 
public class Counter extends Thread{
    volatile int count =0;
    public static void main(String[] args) throws Exception{
        // TODO Auto-generated method stub
    }
    public void run(){
        while(true){
        try {
            Thread.sleep(830);
        } catch (InterruptedException e) {
            // TODO Auto-generated catch block
            System.out.println(e.toString());
        }
        count++;
        }
    }
    public int getCount(){
        return count;
    }
}

　　


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