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?

How can we make String upper case or lower case?

How do you check if two Strings are equal in Java?

What are the four workflow principles?

Explain why workflows are based on extensible models?