有三个线程 T1，T2，T3，怎么确保它们按顺序执行？_有三个线程t1,t2,t3,怎么确保它们按顺序执行?

package com.atguigu.test;

public class Test1 {

	public static void main(String[] args) {
		ThreadA threadA = new ThreadA();
		ThreadB threadB = new ThreadB(threadA);
		ThreadC threadC = new ThreadC(threadB);

		threadA.start();
		threadB.start();
		threadC.start();

	}

}

class ThreadA extends Thread {
	@Override
	public void run() {
		System.out.println("线程A");
	}
}

class ThreadB extends Thread {
	Thread threadA;

	public ThreadB() {
		// TODO Auto-generated constructor stub
	}

	public ThreadB(Thread threadA) {
		this.threadA = threadA;
	}

	@Override
	public void run() {
		try {
			threadA.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("线程B");
	}
}

class ThreadC extends Thread {
	Thread threadB;

	public ThreadC(Thread threadB) {
		this.threadB = threadB;
	}

	@Override
	public void run() {
		try {
			threadB.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println("线程C");
	}
}

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思路:
1.先在主线程开启三个线程。
2.分别向线程2传入线程1，线程3传入线程2，从而分别对它们实现控制。

这样也可以

public class Thread006 {
 
	public static void main(String[] args) {
		Thread thread = new Thread(new Runnable() {
 
			@Override
			public void run() {
				for (int i = 0; i < 30; i++) {
					System.out.println("我是t1线程,i" + i);
				}
 
			}
		});
 
		Thread thread2 = new Thread(new Runnable() {
 
			@Override
			public void run() {
				try {
					thread.join();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				for (int i = 0; i < 30; i++) {
					System.out.println("我是t2线程,i" + i);
				}
 
			}
		});
 
		Thread thread3 = new Thread(new Runnable() {
 
			@Override
			public void run() {
				try {
					thread2.join();
				} catch (InterruptedException e) {
					e.printStackTrace();
				}
				for (int i = 0; i < 30; i++) {
					System.out.println("我是t3线程,i" + i);
				}
 
			}
		});
 
		thread.start();
		thread2.start();
		thread3.start();
 
	}
 
}
 

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