Q Ê 1 Ê What are threads ?
A Ê A   thread is light weight process ,an independent path of execution within a program.

Q Ê 2 Ê Difference btw Thread and process ?
A Ê 1)  Threads share memory among themselves,
        Processes have seperate memory.

    2)  Threads can communicate directly.
        Processes should use Inter Process Communication

Q Ê 3 Ê Why are threads called light weight process?
A Ê     Since threads share memory among them they are light weight process.

Q Ê 4 Ê Are threads platform independent?
A Ê     No they are dependent on the platform as to how it implements the threads.
        especially the scheduling part of it.

Q Ê 5 Ê Can start() be overridden ? If yes what all things need to be taken care of?
A Ê     Yes start can be overridden, 

     a) It should instantiate and register our new thread with  thread scheduler.
     b) it should call run() method.

Q Ê 6 Ê What are the differnt types of threads
A Ê     Deamon Thread : which runs in the background
        NonDeamon : runs in the foreground

Q Ê 7 Ê What are the scenarios when we will use an ArrayList and a vector.
A Ê     ArrayList is not thread safe where as Vector is.

Q Ê 8 Ê what is a daemon thread?
A Ê     The thread which executes at the background is deamon thread 
        you can make a thread deamon by invoking Thread.setDeamon(true)

Q Ê 9 Ê How do we make sure that main thread ends only after all child threads are done?
A Ê     using thread.join method when this is done the main thread waits till all the threads comeplete.

Q Ê 10 Ê How is implementing runnable different from extending threads?
A Ê      Runnable is good when you have to implement or extend another Interface/Class
         Thread is an implementation of Runnable ,which has some methods like interrupt which are implemented.

Q Ê 11 Ê Synchronization ?
A Ê      When two threads access a critical resource 
         they need an effective way to communicate with each other 
         which is achieved through synchronized keyword.


Q Ê 12 Ê How do threads communicate with each other?
A Ê      Using wait,notify,notifyall

Q Ê 13 Ê Thread Priority
A Ê      the higher the prority the more probability the thread gets the processor,
         the priority can be set using setPriority(int Level) method 
         The MAX prority is 10 and min is 1 the default is 5