Java死鎖案例

兩個線程在執行的過程中，因爲爭搶資源而造成相互等待的現象，若無外力干涉的情況，無法推進。（此案例來源於網絡）

class HoldLockThread implements Runnable {
    private String lockA;
    private String lockB;
    
    public HoldLockThread(String lockA, String lockB) {
        this.lockA = lockA;
        this.lockB = lockB;
    }
    @Override
    public void run() {
        synchronized (lockA) {
            System.out.println(Thread.currentThread().getName() + "持有：" + lockA + "嘗試獲取：" + lockB);
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            synchronized (lockB) {
                System.out.println(Thread.currentThread().getName() + "已經持有：" + lockA + "和" + lockA);
            }
        }

    }
}
public class Main {
    public static void main(String[] args) {
        String lockA= "lockA";
        String lockB = "lockB";
        new Thread(new HoldLockThread(lockA, lockB)).start();
        new Thread(new HoldLockThread(lockB, lockA)).start();
    }
}