线程A中加入线程B，B中加入C，运行结果不对

豆腐花发 2016-06-27 11:57:35

线程A中加入线程B，B中加入C，理论上应该：先执行C，后执行B，再执行A；

运行结果是：B执行完后，执行C，然后A不执行了，这是咋回事？

三个进程都是现实进度条从0到100，

完整代码如下：
import java.awt.*;

import javax.swing.*;

public class Practice extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private Thread threadA; // 定义两个线程
private Thread threadB;
private Thread threadC;

final JProgressBar progressBar = new JProgressBar(); // 定义两个进度条组件

final JProgressBar progressBar2 = new JProgressBar();
final JProgressBar progressBar3 = new JProgressBar();
int count = 0;

//JProgressBar jpbar = new JProgressBar();
//JProgressBar jpbar2 = new JProgressBar();

public static void main(String[] args) {
init(new Practice(), 100, 100);
}

public Practice() {
super();
// 将进度条设置在窗体最北面
//getContentPane().add(progressBar, BorderLayout.NORTH);
//progressBar.setStringPainted(true);
getContentPane().add(progressBar, BorderLayout.NORTH);

getContentPane().add(progressBar3, BorderLayout.CENTER);

// 将进度条设置在窗体最南面
getContentPane().add(progressBar2, BorderLayout.SOUTH);
progressBar.setStringPainted(true); // 设置进度条显示数字字符
progressBar2.setStringPainted(true);
progressBar3.setStringPainted(true);
// 使用匿名内部类形式初始化Thread实例子
threadA = new Thread(new Runnable() {
int count = 0;

public void run() { // 重写run()方法
while (true) {

progressBar.setValue(++count); // 设置进度条的当前值
//System.out.println()
//progressBar.setValue(++count);
try {
Thread.sleep(100); // 使线程A休眠100毫秒
threadB.join(); // 使线程B调用join()方法

} catch (Exception e) {
e.printStackTrace();
}

}
}
});
threadA.start(); // 启动线程A

threadB = new Thread(new Runnable() {
int count = 0;

public void run() {
while (true) {
progressBar2.setValue(count);// 设置进度条的当前值
count = count + 10;
try {
Thread.sleep(100); // 使线程B休眠100毫秒
threadC.join();
} catch (Exception e) {
e.printStackTrace();

}

}
}
});
threadB.start(); // 启动线程B

threadC = new Thread(new Runnable() {
int count = 0;

public void run() {
while (true) {
progressBar3.setValue(count);// 设置进度条的当前值
count = count + 10;
try {
Thread.sleep(100); // 使线程B休眠100毫秒
} catch (Exception e) {
e.printStackTrace();

}

if(count == 110){
break;
}

}
}
});
threadC.start(); // 启动线程B
}

// 设置窗体各种属性方法
public static void init(JFrame frame, int width, int height) {
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(width, height);
frame.setVisible(true);
}
}

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