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; }} |
通过运用多线程来异步控制程序的运行,布布扣,bubuko.com
原文地址：http://www.cnblogs.com/shanyangmanbu/p/3737882.html
