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();
}
}
