Case Conversions
As the Java language is case sensitive, it differentiates uppercase letters from lowercase letters. The String class provides two methods, namely toLowerCase( ) and toUpperCase( ) to facilitate case conversions. While the toLowerCase( ) method converts all the letters of the given string to lower case, the toUpperCase( ) method does just the opposite.
Program
Program Source
public class Javaapp { public static void main(String[] args) { String str1 = "AbCdEfGh"; String str2 = str1.toUpperCase(); String str3 = str2.toLowerCase(); System.out.println("str1 -> "+str1); System.out.println("str2 -> "+str2); System.out.println("str3 -> "+str3); } }