举例说明线程中sleep方法的使用

package test;

public class TestSync {
	public static void main(String args[]) {
		Target t = new Target();
		new ThreadA(t).start();
		new ThreadB(t).start();
	}
}

class Target {
	String msg = "<我是线程要访问的对象>";

	public void show() {
		char[] msgchars = msg.toCharArray();
		for (int i = 0; i < msgchars.length; i++) {
			System.out.print(msgchars[i]);
			try {
				Thread.sleep(1000);
			} catch (Exception e) {
			}
		}
	}
}

class ThreadA extends Thread {
	Target target;

	public ThreadA(Target target) {
		this.target = target;
	}

	public void run() {
		synchronized (target) {// 同步对象
			target.show();
		}
	}
}

class ThreadB extends Thread {
	Target target;

	public ThreadB(Target target) {
		this.target = target;
	}

	public void run() {
		synchronized (target) {// 同步对象
			target.show();
		}
	}
}