if i call a non synchronized method from my synchronized method is non synchronized method thread safe?

I i make a call to noonsynchronized method from within my synchronized method is it thread safe?

I have 2 methods as follows:

public class MyClass{

 void synchronized doSomething1(){

   doSomething2();
  }

void doSomething2(){
 //will this block of code be synchronized if called only from d开发者_JAVA百科oSomething1??
 }

}

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If doSomething2() is only called from doSomething1(), then it will only be called by a single thread for a single instance of MyClass. It could still be called from different threads at the same time, via different instances - so if it acts on any shared data which may not be specific to the instance of MyClass, it's still not guaranteed to fix all threading issues.

Basically, you need to think carefully about any mutable shared state used by multiple threads - there are no easy fixes to that, if you need mutable shared state. In your particular case you'd also need to make sure that doSomething2() was only called from doSomething1() - which would mean making it private to start with...

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When calling doSomething1() the caller's Thread locks on the monitor of the instance of MyClass. Until that thread's execution exits doSomething1 the lock will remain which includes if it goes into doSomething2. This will cause other threads to block when attempting to lock.

Keep in mind: synchronized does not thread-safe it make.

Further info:

• JLS 3rd Ed 17.1 Locks

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If doSomething2() is called ONLY from doSomething1() then yes - it is thread safe.