Java模拟死锁

synchronized实现

package com.example.demo.dealock.synchronize;

/**
 * @author chenwei
 * @date 2025-12-17 17:02
 * @description
 */
public class DeadLockDemo {

    public final static Object lockA = new Object();
    public final static Object lockB = new Object();

    public static void main(String[] args){
        new Thread("死锁线程1"){
            @Override
            public void run() {
                synchronized (lockA){
                    System.out.println("Thread 1: Holding lock A...");
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("Thread 1: Waiting for lock B...");
                    synchronized (lockB){
                        System.out.println("Thread 1: Acquired lock B!");
                    }
                }
            }
        }.start();

        new Thread("死锁线程2"){
            @Override
            public void run() {
                synchronized (lockB){
                    System.out.println("Thread 2: Holding lock B...");
                    try {
                        Thread.sleep(100);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println("Thread 2: Waiting for lock A...");
                    synchronized (lockA){
                        System.out.println("Thread 2: Acquired lock A!");
                    }
                }
            }
        }.start();
    }
}

ReentrantLock实现

package com.example.demo.dealock.reentrenlock;

import java.util.concurrent.locks.ReentrantLock;

/**
 * @author chenwei
 * @date 2025-12-17 17:14
 * @description
 */
public class DeadLockDemo {

    public final static ReentrantLock lockA = new ReentrantLock();
    public final static ReentrantLock lockB = new ReentrantLock();

    public static void main(String[] args){
        new Thread("死锁线程1"){
            @Override
            public void run() {
                lockA.lock();
                System.out.println("Thread 1: Holding lock A...");
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Thread 1: Waiting for lock B...");
                {
                    lockB.lock();
                    System.out.println("Thread 1: Acquired lock B!");
                    lockB.unlock();
                }
                lockA.unlock();
            }
        }.start();

        new Thread("死锁线程2"){
            @Override
            public void run() {
                lockB.lock();
                System.out.println("Thread 2: Holding lock B...");
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                System.out.println("Thread 2: Waiting for lock A...");
                {
                    lockA.lock();
                    System.out.println("Thread 2: Acquired lock A!");
                    lockA.unlock();
                }
                lockB.unlock();
            }
        }.start();
    }
}