import java.awt.BorderLayout; 
import java.awt.event.ActionEvent; 
import java.awt.event.ActionListener; 
import javax.swing.JButton; 
import javax.swing.JFrame; 
import javax.swing.JLabel; 
import javax.swing.JPanel; 
import javax.swing.JTextField; 

/** 
 * 线程的优先级 
 * 10个计数器线程分别被设置了不同的优先级，我们通过计数器的累加来观察优先级的作用 
 * @author 五斗米 
 * @blog http://blog.csdn.net/mq612 
 */
public class TestMain extends JFrame { 
    private MyThread [] thread = null; // 要操作的线程 
    private JPanel pane = null; 
    private JButton startButton = null, stopButton = null; // 启动、结束按钮 

    public TestMain(){ 
        super("线程的优先级"); 
        pane = new JPanel(); 
        thread = new MyThread[10]; 
        for(int i = 0; i < 10; i++){ // 线程的优先级最小是1，最大是10 
            thread[i] = new MyThread(i + 1); 
        } 
        startButton = new JButton("执行"); 
        startButton.addActionListener(new ActionListener(){ 
            public void actionPerformed(ActionEvent e) { 
                for(int i = 0; i < 10; i++){ 
                    thread[i].start(); 
                } 
            } 
        }); 
        stopButton = new JButton("结束"); 
        stopButton.addActionListener(new ActionListener(){ 
            public void actionPerformed(ActionEvent e) { 
                for(int i = 0; i < 10; i++){ 
                    thread[i].quit(); 
                } 
            } 
        }); 
        JPanel p = new JPanel(); 
        p.add(startButton); 
        p.add(stopButton); 
        this.getContentPane().add(pane); 
        this.getContentPane().add(p, BorderLayout.NORTH); 
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        this.setSize(500, 300); 
        this.setLocationRelativeTo(null); 
        this.setVisible(true); 
    } 
    /** 
     * 计数器线程 
     */
    class MyThread extends Thread{ 
        private JTextField text = null; // 计数器 
        private int i = 0; // 计数器 
        private int priority = 0; // 优先级 
        private JLabel label = null; // 优先级显示标签 
        private boolean b = true; // 控制线程结束的boolean变量 

        public MyThread(int priority){ 
            this.priority = priority; 
            this.setPriority(priority); 
            JPanel p = new JPanel(); 
            label = new JLabel("Priority=" + priority); 
            text = new JTextField(12); 
            p.add(label); 
            p.add(text); 
            pane.add(p); // 将自己的计数器加入主窗口面板中 
        } 
        /** 
         * 结束线程 
         */
        public void quit(){ 
            b = false; 
        } 
        public void run(){ 
            while(b){ 
                this.text.setText(Integer.toString(i++)); 
                try { 
                    this.sleep(1); // 减小这里的毫秒数，可以让我们更容易观察到结果 
                } catch (InterruptedException ex) { 
                    ex.printStackTrace(); 
                } 
            } 
        } 
    } 

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