What is the difference between String, String Buffer and StringBuilder?

Why String is immutable or final in Java?

How to split String in java?

Write a function to find out longest palindrome in a given string?

How to convert String to byte array and vice versa?

Why String is popular HashMap key in Java?

Explain the scenarios to choose between String, StringBuilder and StringBuffer?

How to compare two Strings in java program?

What does String intern() method do?

Write a program to print all permutations of String?

Why Char array is preferred over String for storing password?