1、两个线程交替运行

public static void test1() {
		new Thread() {
			public void run() {
				synchronized (Class.class) {
					while (true) {
                                                //通知对方
						Class.class.notify();
						System.out.println("线程一");
						try {
                                                //通知完成后进入等待对方唤醒
							Class.class.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}.start();
		new Thread() {
			public void run() {
				synchronized (Class.class) {
					while (true) {
                                                //通知对方
						Class.class.notify();
						System.out.println("线程二");
						try {
                                                //通知完成后进入等待对方唤醒
							Class.class.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}.start();
	}

2、三个进程间的通信，将notify换成notifyall

public static void test2() {
		new Thread() {
			public void run() {
				synchronized (Class.class) {
					while (true) {
						Class.class.notifyAll();
						System.out.println("线程一");
						try {
							Class.class.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}.start();
		new Thread() {
			public void run() {
				synchronized (Class.class) {
					while (true) {
						Class.class.notifyAll();
						System.out.println("线程二");
						try {
							Class.class.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}.start();

		new Thread() {
			public void run() {
				synchronized (Class.class) {
					while (true) {
						Class.class.notifyAll();
						System.out.println("线程三");
						try {
							Class.class.wait();
						} catch (InterruptedException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}.start();

	}