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;
}
} |