CODEWITHSUNDEEP
javaobjectsynchronization
orochi
orochi

Reputation: 1258

Difference between synchronized

Is the this and Example.this the same object?

E.g. Is the call this and Example.class inside the synchronized the same object?

class Example {
    public Example() {
        synchronized(this) {
            // some code
        }
    }
}


class Example {
    public Example() {
        synchronized(Example.class) {
            // some code
        }
    }
}

Upvotes: 0

Views: 70

Answers (4)

Bathsheba
Bathsheba

Reputation: 234635

No.

Synchronizing on this is instance-level locking, meaning that the critical section cannot be re-entered with same object.

Synchronizing on Example.class is class-level locking, meaning that no other instance of the class, including this, can enter that critical section.

As you can see, class-level locking is, in a sense, more drastic.

Upvotes: 1

Sam
Sam

Reputation: 182

This will synchronize access to the locked class instead of the this/current object. Use whichever you find easier and more effective.

Upvotes: 0

luk2302
luk2302

Reputation: 57114

No, this is an instance of Example while Example.class is an instance of Class.

Upvotes: 1

Vadim Beskrovnov
Vadim Beskrovnov

Reputation: 961

No, this use current object as monitor, but Example.class use Example.class as monitor.

Upvotes: 3

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