路人过河

package victors;

import java.util.Random;

public class Test {

	public static void main(String[] args) {
		// TODO 自动生成的方法存根

		 Guoddong guoddong = new Guoddong();
		// Thread thread = new Thread();
		Random random = new Random();
		String str = "abcdefghijklmnopqrstuvwxyz";
		for (int i = 1; i <= 10; i++) {
			Thread thread = new Thread(guoddong);
			String itemStr = "" + str.charAt(random.nextInt(str.length())) + str.charAt(random.nextInt(str.length()))
					+ str.charAt(random.nextInt(str.length())) + str.charAt(random.nextInt(str.length())) + i;// 随机生成四个
			thread.setName("线程" + i + ":路人" + itemStr);
			thread.start();
		}
	}

}

package victors;

public class Guoddong implements Runnable {
	private Object lock = new Object();

	@Override
	public void run() {
		// TODO 自动生成的方法存根
		synchronized (lock) {
			System.out.println(Thread.currentThread().getName() + "正在通过山洞");
			try {
				Thread.sleep(2000);
			} catch (Exception e) {
				// TODO: handle exception
				e.printStackTrace();
			}
			System.out.println(Thread.currentThread().getName() + "通过山洞");

		}
	}
}