Can you inherit from an abstract class java?
What are the basic interfaces of java collections framework?
Why is logger singleton?
What are the 3 types of control structures?
what is ennumaration?
What are the principle concepts of oops?
How will you calculate the depth of a binary tree if the tree contains 15 nodes?
how we can make a write-only class in java?
What is the core java?
Difference between final and effectively final ? Why is effectively final even required ?
What is the point of polymorphism java?
A person says that he compiled a java class successfully without even having a main method in it? Is it possible?
write a class to input 2 points by the user & check the line maked by the points is horizontal,vertical or rectangle?