多线程之死锁案例一

package example;

/**

 * 模拟死锁

 * @author maple

 *

 */

public class DeadLock {

	public int flag = 1;

	/**

	 * 这里必须要用静态的锁对象,o1,o2

	 * 因为new两个对象时，他们共享静态变量，持有的锁才会有冲突

	 */

	private static Object o1 = new Object();

	private static Object o2 = new Object();

	public DeadLock(int flag) {

		this.flag=flag;

	}

	public void m(){

		if(flag == 1){

			synchronized (o1) {

				System.out.println("i am in  flag 1");

				try {

					Thread.sleep(500);

				} catch (InterruptedException e) {

					e.printStackTrace();

				}

				synchronized (o2) {

					System.out.println("i have o2");

				}

			}

		}

		if(flag == 0){

			synchronized (o2) {

				System.out.println("i am in  flag 0");

				try {

					Thread.sleep(500);

				} catch (InterruptedException e) {

					e.printStackTrace();

				}

				synchronized (o1) {

					System.out.println("i have o1");

				}

			}

		}

	}

	public static void main(String[] args) {

		DeadLock d1 = new DeadLock(1);

		DeadLock d2 = new DeadLock(0);

		new Thread(()->d1.m(),"t1").start();

		new Thread(()->d2.m(),"t2").start();

	}

}