簡單測試可能會顯示在線程終止時未釋放鎖定：

import java.util.concurrent.locks.Lock;

import java.util.concurrent.locks.LockSupport;

import java.util.concurrent.locks.ReentrantLock;

public class LockTest {

public static void main(String[] args) {

final Lock l = new ReentrantLock();

Thread t = new Thread() {

@Override

public void run() {

System.out.println(Thread.currentThread()+": Acquire lock");

l.lock();

System.out.println(Thread.currentThread()+": Lock aquired: wait");

LockSupport.parkNanos(1_000_000_000);

System.out.println(Thread.currentThread()+"; Exiting");

}

};

t.start();

LockSupport.parkNanos(500_000_000);

System.out.println(Thread.currentThread()+": Acquire lock");

l.lock();

System.out.println(Thread.currentThread()+"; Success!");

}

}

輸出：

Thread[Thread-0,5,main]: Acquire lock

Thread[Thread-0,5,main]: Lock aquired: wait

Thread[main,5,main]: Acquire lock

Thread[Thread-0,5,main]; Exiting

// "Success" is never written: stuck in dead-lock

因此當單獨的線程獲得鎖定,然后退出時,主線程無法進行鎖定.

總結

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