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Which intrinsic lock is acquired by a synchronized method in Java?

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Pragya Keshap answered on February 4, 2023 Popularity 1/10 Helpfulness 8/10

answer Which intrinsic lock is acquired by a synchronized method in Java?

Which intrinsic lock is acquired by a synchronized method in Java?

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When we mark a method as synchronized and then call this method,

then this method will first acquire the intrinsic lock of the object in

which that method is mentioned.

Once the synchronized method returns, it releases the lock.

In case the synchronized method throws an exception, the intrinsic

lock will be released.

Sample code equivalent to a synchronized method is:

public void myMethod() {

synchronized(this) {

}

public class ThreadLockDemo {

    public static void main (String[] args) throws InterruptedException {
        ThreadLockDemo demo = new ThreadLockDemo();
        Thread thread1 = new Thread(() -> {
            System.out.println("thread1 before call "+ LocalDateTime.now());
            demo.syncMethod("from thread1");
            System.out.println("thread1 after call "+LocalDateTime.now());
        });
        Thread thread2 = new Thread(() -> {
            System.out.println("thread2 before call "+LocalDateTime.now());
            demo.syncMethod("from thread2");
            System.out.println("thread2 after call "+LocalDateTime.now());
        });

        thread1.start();
        thread2.start();
    }

    private synchronized void syncMethod (String msg) {
        System.out.println("in the sync method "+msg+" "+LocalDateTime.now());
        try {
            TimeUnit.SECONDS.sleep(5);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

https://www.logicbig.com/tutorials/core-java-tutorial/java-multi-threading/java-intrinsic-locks.html

Popularity 1/10 Helpfulness 8/10 Language java

Source: Grepper

Tags: java synchronized

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Contributed on Feb 04 2023

Pragya Keshap

0 Answers Avg Quality 2/10

Which intrinsic lock is acquired by a synchronized method in Java?

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