How to Convert Strings to Uppercase and Lowercase in Java

In this example we will show the method to convert strings to uppercase and lowercase in Java.

Source Code

package com.beginner.examples;

public class UpperLower {
  public static void main(String[] args) {
    String str = "Good!";
    System.out.println(str.toUpperCase()); // convert strings to uppercase
    System.out.println(str.toLowerCase()); //convert strings to lowercase
  }
}

Output:

GOOD!
good!