Is it possible to insert different type of elements in a stack? How?
Which collection allows null values?
What is a simple path?
What is difference between tree and forest?
Is data structures and algorithms important?
What is a height of a tree?
Why entry interface is used in map?
Define heap order property?
Write a program to reverse a link list.
What is stack in geography?
Define an algorithm.
What is the minimum number of nodes that a binary tree can have?
Is arraylist reference type?