How to change case of a string characters in Java?

Below example shows how to convert the case of a given string. toUpperCase() method converts all string characters to upper case. toLowerCase() method converts all string characters to lower case.

package com.myjava.string;

public class MyStringCase {
    public static void main(String a[]){
        String str = "Change My Case";
        System.out.println("Upper Case: "+str.toUpperCase());
        System.out.println("Lower Case: "+str.toLowerCase());
    }
}