Wells Fargo Java Interview Questions

 1.  What is command design patter? Example in JDK.

      2. Decorator design patter and implementation in JDK?

      3. Thread pool uses which design pattern?

      4. Can we handle Error in catch block? Can we handle OutOfMemoryError in catch block? If yes why we not do in general uses?

      5. How to log every time a object is getting GC ? finalize. Does finalize block always run before GC ?

      6. When finally block does not run ? Like system.exit(0)

      7. Write a programme which sum number from 10*10 dimension array ? We need to do in fastest way.  If we use multiple thread and a particular thread is stuck how we make sure other thread run smoothly

      8. Write a programme to create a cache where object is removed after certain period of time ?

      9. Questions of multiple thread and lock of different methods (static and non-static) ?

      10. Question on semaphore countdown latch ?

      11. How hashmap and concurrent hash map work ? what is concurrency level in hash map?

      12. What is concurrency modification exception? and detail when it occur in list?

  

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