Java Thread holdLock() method

The holdLock() method of thread class returns true if the current thread holds the monitor lock on the specified object.

Syntax

Parameter

obj: It defines the object on which to test lock ownership

Return

It returns true if and only if the current thread holds the monitor lock on the specified object. Otherwise, it returns false.

Exception

NullPointerException: This exception throws if obj is null.

Example

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();
    }
}

Test it Now

Output:

Currently executing thread is: Thread-0
Does thread holds lock? false
Does thread holds lock? true

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