两个线程共享两个对象o1,o2
线程1先把o1锁住,再把o2锁住
线程2先把o2锁住,再把o1锁住
此时程序会静止不动
图解(引自b站老杜javase零基础):
public class DeadLock {
public static void main(String[] args) {
Object o1 = new Object();
Object o2 = new Object();
// t1和t2两个线程共享o1,o2
Thread t1 = new MyThread1(o1,o2);
Thread t2 = new MyThread2(o1,o2);
t1.start();
t2.start();
}
}
class MyThread1 extends Thread{
Object o1;
Object o2;
public MyThread1(Object o1,Object o2){
this.o1 = o1;
this.o2 = o2;
}
public void run(){
synchronized(o1){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o2){
}
}
}
}
class MyThread2 extends Thread{
Object o1;
Object o2;
public MyThread2(Object o1,Object o2){
this.o1 = o1;
this.o2 = o2;
}
public void run(){
synchronized (o2){
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
synchronized (o1){
}
}
}
}
运行结果:
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