Semaphore實現的三個線程協做循環打印10次ABC的方法

package demo0;
import java.util.concurrent.Semaphore;
 
/**
 * 使用Semaphore實現的三個線程協做，循環打印10次ABC的方法
 * @author mengfeiyang
 *
 */
public class TestOderThread {
 
    private static Semaphore semaphore1 = new Semaphore(0);
    private static Semaphore semaphore2 = new Semaphore(0);
    private static Semaphore semaphore3 = new Semaphore(0);
    public Thread t1;
    public Thread t2;
    public Thread t3;
 
    int count = 10;
     
    public TestOderThread() {
        t1 = new Thread() {
            public void run() {
                try {
                    semaphore3.release();
                    int i = 0;
                    while(i++ < count) {
                        semaphore3.acquire();//得到許可
                        System.out.print("A");
                        semaphore1.release();//初始化時都是鎖住狀態，操做完以後釋放許可，
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        };
        t2 = new Thread() {
            public void run() {
                try {
                    int i = 0;
                    while(i++ < count) {
                        semaphore1.acquire();
                        System.out.print("B");
                        semaphore2.release();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
        t3 = new Thread() {
            public void run() {
                try {
                    int i = 0;
                    while(i++ < count) {
                        semaphore2.acquire();
                        System.out.println("C");
                        semaphore3.release();
                    }
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        };
 
    }
 
    public void run() {
        t1.start();
        t2.start();
        t3.start();
    }
 
    public static void main(String args[]) throws Exception {
    	
        TestOderThread t = new TestOderThread();
        t.run();
    }
}