1、死锁案例

/**
 * @descpription: 死锁案例
 * @date 2024/6/17
 */
public class DeadLockDemo {
    public static void main(String[] args) {
        Object objA = new Object();
        Object objB = new Object();
        new Thread(() ->{
            synchronized (objA){
                System.out.println(Thread.currentThread().getName() + "\t 持有A锁,希望获取B锁");
                try {TimeUnit.MILLISECONDS.sleep(100);} catch (InterruptedException e) {throw new RuntimeException(e);}
                synchronized (objB){
                    System.out.println(Thread.currentThread().getName() + "\t 成功持有B锁");
                }
            }
        },"t1").start();

        new Thread(() ->{
            synchronized (objB){
                System.out.println(Thread.currentThread().getName() + "\t 持有B锁,希望获取A锁");
                try {TimeUnit.MILLISECONDS.sleep(100);} catch (InterruptedException e) {throw new RuntimeException(e);}
                synchronized (objA){
                    System.out.println(Thread.currentThread().getName() + "\t 成功持有A锁");
                }
            }
        },"t2").start();
    }
}

2、运行效果

3、排查死锁

查看线程号

通过jstack查找死锁