KeySet is a set returned by the keySet() method of the Map Interface, It is a set that contains all the keys present in the Map.
Thursday, 15 March 2012
Java provides three methods that threads can use to communicate with each other: wait, notify, and notifyAll. These methods are defined for all Objects (not just Threads). The idea is that a method called by a thread may need to wait for some condition to be satisfied by another thread; in that case, it can call the wait method, which causes its thread to wait until another thread calls notify or notifyAll.
Yes, We can call a abstract method from a Non abstract method in a Java abstract class