Java多线程并发编程中的死锁问题实例-蒲公英云

Java多线程并发编程中的死锁问题实例

原创女爷i 2024-10-13 16:45 146阅读 0赞

死锁是多线程并发编程中常见的问题。当两个或更多的线程在执行过程中因争夺资源而造成的一种互相等待的现象，就称为死锁。

以下是一个简单的Java死锁例子：

// 线程1
public class Thread1 extends Thread {
    private Object lock1 = new Object();
    private Object lock2 = new Object();
    public void run() {
        synchronized (lock1) { // 死锁条件1：锁A持有
            try {
                System.out.println("Thread 1 acquired lock1");
                // 在这里，线程2可能会等待锁1释放
                synchronized (lock2) { // 死锁条件2：锁B持有
                    System.out.println("Thread 1 acquired lock2");
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
// 线程2
public class Thread2 extends Thread {
    private Object lock1 = new Object();
    private Object lock2 = new Object();
    public void run() {
        synchronized (lock1) { // 死锁条件1：锁A持有
            try {
                System.out.println("Thread 2 acquired lock1");
                // 在这里，线程1可能会等待锁2释放
                synchronized (lock2) { // �死锁条件2：锁B持有
                    System.out.println("Thread 2 acquired lock2");
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}
public class Main {
    public static void main(String[] args) {
        Thread1 thread1 = new Thread1();
        Thread2 thread2 = new Thread2();
        thread1.start(); // 启动线程1
        thread2.start(); // 启动线程2
        try {
            // 线程执行完毕后，主线程等待
            Thread.sleep(5000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}