Can hashset contain null?
Does treemap sort on key or value?
How do you replace an element in an arraylist?
What is vector and types of vector?
How efficient is bubble sort?
Give one example of right rotation.
Describe queue operation.
In tree construction which is the suitable efficient data structure?
What is the need for path compression?
Define forest?
Define in brief an array.
What is arraylist load factor?
Check if duplicates exist in an array of N which has range 1 to N.