Multi Threading

http://www.buyya.com/java/Chapter14.pdf

Q7) What is the difference when the synchronized keyword is applied to a static method or to a non static method?

Ans) When a synch non static method is called a lock is obtained on the object. When a synch static method is called a lock is obtained on the class and not on the object. The lock on the object and the lock on the class don’t interfere with each other. It means, a thread accessing a synch non static method, then the other thread can access the synch static method at the same time but can’t access the synch non static method.

http://java-questions.com/Threads_interview_questions.html