여러 스 레 드 순서 로 실행 되 는 몇 가지 방법

참고:http://www.cnblogs.com/icejoywoo/archive/2012/10/15/2724674.html
1.신 호 량 Sephmore

public class SyncThreadTest {

	private static Semaphore A = new Semaphore(1);
	private static Semaphore B = new Semaphore(1);
	private static Semaphore C = new Semaphore(1);
	public static void main(String[] args) {
		ThreadA a = new ThreadA();
		ThreadB b = new ThreadB();
		ThreadC c = new ThreadC();
		try {
			B.acquire();
			C.acquire();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		a.start();
		b.start();
		c.start();
		System.out.print("over
");
	}

	static class ThreadA extends Thread {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			super.run();
			try {
				for(int i = 0; i < 10; i++) {
					A.acquire();
					System.out.print("thread a run" + i + "
");					
					B.release();
				}
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	static class ThreadB extends Thread {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			super.run();
			try {
				for(int i = 0; i < 10; i++) {
					B.acquire();
					System.out.print("thread b run" + i + "
");					
					C.release();
				}
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	static class ThreadC extends Thread {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			super.run();
			try {
				for(int i = 0; i < 10; i++) {
					C.acquire();
					System.out.print("thread c run" + i + "
");					
					A.release();
				}
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}

2、ReentrantLock 사용
3.ReetrantLock 과 Condition 의 조합
condition 도 사용 할 수 있 습 니 다.condition 의 효율 이 더 높 을 수 있 습 니 다.await 는 lock 자 물 쇠 를 방출 합 니 다.condition 의 await 와 signal 은 object 의 wait 와 notify 방법 과 유사 합 니 다.

public class SyncThreadTestReentrantLock {
	private static Lock lock = new ReentrantLock();
	private static int state = 0;
	public static void main(String[] args) {
		ThreadA a = new ThreadA();
		ThreadB b = new ThreadB();
		ThreadC c = new ThreadC();
		a.start();
		b.start();
		c.start();
		/*try {
			a.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			b.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		try {
			c.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}*/
		System.out.print("over
");
	}

	static class ThreadA extends Thread {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			super.run();
			int i = 0;
			while(i < 10) {
				//System.out.print("thread a begin 
");
				lock.lock();
				//System.out.print("thread a lock 
");
				if (state % 3 == 0) {
					System.out.print("thread a run"  + "
");
					state++;
					i++;
				}
				lock.unlock();
				//System.out.print("thread a end 
");
			}
		}
	}

	static class ThreadB extends Thread {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			super.run();
			int i = 0;
			while(i < 10) {
				//System.out.print("thread b begin 
");
				lock.lock();
				//System.out.print("thread b lock 
");
				if (state % 3 == 1) {
					System.out.print("thread b run" + i + "
");
					state++;
					i++;
				}
				lock.unlock();
				//System.out.print("thread b end 
");
			}
		}
	}

	static class ThreadC extends Thread {
		@Override
		public void run() {
			// TODO Auto-generated method stub
			super.run();
			int i = 0;
			while(i < 10) {
				//System.out.print("thread c begin 
");
				lock.lock();
				//System.out.print("thread c lock 
");
				if (state % 3 == 2) {
					System.out.print("thread c run" + i + "
");
					state++;
					i++;
				}
				lock.unlock();
				//System.out.print("thread c end 
");
			}
		}
	}
}