如果当前线程在指定对象上保存监视器锁，则Thread类的holdLock()方法返回true。
语法
public static boolean holdsLock(Object obj)
参数
obj：它定义了测试锁所有权的对象
返回
当且仅当当前线程在指定对象上保存监视器锁时，它才返回true。 否则，它返回false。
示例
NullPointerException：如果obj为null，则抛出此异常。
示例
public class JavaHoldLockExp implements Runnable
{
public void run()
{
// print currently executing thread
System.out.println("Currently executing thread is: " + Thread.currentThread().getName());
// returns true if the current thread holds the lock on the specified object
System.out.println("Does thread holds lock? " + Thread.holdsLock(this));
synchronized (this)
{
System.out.println("Does thread holds lock? " + Thread.holdsLock(this));
}
}
public static void main(String[] args)
{
JavaHoldLockExp g1 = new JavaHoldLockExp();
// create a thread
Thread t1 = new Thread(g1);
// this will call run() function
t1.start();
}
}
执行上面示例代码，得到以下结果：
Currently executing thread is: Thread-0
Does thread holds lock? false
Does thread holds lock? true
