java多线程相关知识点

1.sleep和wait的区别

(1).sleep是Thread中的静态方法,谁调用谁去睡觉,即使在T1线程里调用了T2线程的sleep方法,
实际上还是T1去睡觉。
(2)sleep方法不会释放对象得锁，而wait方法释放了锁.
(3)wait，notify和notifyAll只能在同步控制方法或者同步控制块里面使用，而sleep可以在任何地方使用。

2.多线程练习

(1)子线程循环10次，接着主线程循环100，接着又回到子线程循环10次，接着再回到主线程又循环100，如此循环50次，请写出程序。

public class Test {

	public static void main(String[] args) {

		MyThread myThread = new MyThread();

		new Thread(new Runnable() {

			@Override
			public void run() {
				for (int i = 0; i < 50; i++) {
					try {
						myThread.subThread(i);
					} catch (InterruptedException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					}
				}
			}
		}).start();
		
		
		for(int i = 0; i < 50; i++) {
			try {
				myThread.mainThread(i);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}

	}
}

class MyThread {

	private boolean isSubThread = true;

	public synchronized void subThread(int i) throws InterruptedException {

		if (!isSubThread) {
			this.wait();
		}

		for (int j = 0; j < 10; j++) {
			System.out.println("这是subThread>>>>" + i + "次循环," + "loop>>>" + j);
		}

		isSubThread = false;
		this.notify();
	}

	public synchronized void mainThread(int i) throws InterruptedException {

		if (isSubThread) {
			this.wait();
		}

		for (int j = 0; j < 100; j++) {
			System.out.println("这是MainThread>>>>" + i + "次循环," + "loop>>>" + j);
		}

		isSubThread = true;
		this.notify();
	}

}

未完待续…