- MultiThreading vs MultiProcessing vs MultiProgramming vs MultiTasking?
- Life cycle of a Thread
- Extends vs Runnable
- yield() vs sleep() vs join() ?
- wait() vs sleep() ?
- why is join() method used?
- Can we Override start() method in Thread?
- Can we Override run() method?
- Can we start the thread twice?
- What is IllegalThreadStateException?
- What happens if run() method is called without start()?
- Why do we use ThreadPool?
- What is Race Condition?
- What is Synchronisation?Types of Synchronisation?
- Object Level Locking vs Class Level Locking?
- If there is 2 synchronised methods m1 and m2 in a class, can 2 different threads t1 and t2 call different methods(m1,m2) respectively on same object of class c at same time ?
Answer — No. Only 1 Thread can hold the lock on a object of a class.However the other non synchronised methods can be called on same object. - If a class has a synchronised method and non synchronised method, can multiple threads execute non synchronised methods?
Answer: yes. If a class has a synchronised method and non synchronised method , multiple threads can access non synchronised methods. - Can 2 threads call 2 different static synchronised methods of same class?
Answer : The static synchronised methods of same class always block each other as 1 lock per class exists. So no 2 static synchronised methods can execute at the same time. - Does static synchronised methods block a non synchronised methods?
Answer: No. The thread executing static synchronised method holds a lock on the class and the executing the non static synchronised method holds lock on the object on which the method has been called, these 2 locks are different and these threads dont block eachother. - Can Constructors be synchronised?
- What is DeadLock?
- What is Inter thread communication?Explain wait(),notify() and notifyall()?
- What is IllegalMonitorStateException?
- Which class does wait(),notify() and notifyall() method belong?
- Explain few Thread class methods?is Sleep() a method in Thread class or Object class?
- Producer Consumer Problem in Java?
- Volatile vs Synchronised?
- What are Atomic variables?
Multithreading
