Regarding synchronized methods in Java

Question

I have a question about synchronization of methods in Java.

Consider a class with 3 synchronized methods.

class MyClass{ public synchronized void methodA(){ ... } public synchronized void methodB(){ ... } public synchronized void methodC(){ ... } }

Consider myObject, an instance of myClass. Which of the following is true?

Option 1:

It's impossible for a thread to run any synchronized method in myObject, while a different thread is running any synchronized method in myObject.

For example, while thread 1 is running methodA() of the instance myObject, thread 2 can't run any of the methods methodA(), methodB() and methodC().

Option 2:

It's impossible for a thread to run a specific synchronized method in myObject, while that specific method is being run by another thread.

For example, while thread 1 is running methodA() of the instance myObject, thread 2 can't run the method methodA(), but can run methodB() or methodC(). (Meaning, the three synchronized methods aren't 'connected').

possible duplicate of Do two synchronized methods execute simultaneously — Daniël Knippers
– Daniël Knippers, Commented Mar 15, 2014 at 15:09

kraskevich · Accepted Answer · 2014-03-15 15:06:49Z

3

The first option is true because there is basically one lock used for all the methods.

answered Mar 15, 2014 at 15:06

kraskevich

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2 Comments

Aviv Cohn Over a year ago

So while thread 1 runs methodA() in a specific instance, thread 2 can't run methodA(), can't run methodB(), and can't run methodC()?

Aviv Cohn Over a year ago

Thanks :) Will accept the answer when the 7 minuts are up

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