java.lang.Character.isLowerCase(char ch) java.lang.Character.isLetterOrDigit(int codePoint) java.lang.Character.isLowerCase(int codePoint) java.lang.Character.isLowerCase(char ch) package com.codingdict; import java.lang.*; public class CharacterDemo { public static void main(String[] args) { // create 2 char primitives ch1, ch2 char ch1, ch2; // assign values to ch1, ch2 ch1 = 'A'; ch2 = 'a'; // create 2 boolean primitives b1, b2 boolean b1, b2; // check if ch1, ch2 are in lowercase and assign results to b1, b2 b1 = Character.isLowerCase(ch1); b2 = Character.isLowerCase(ch2); String str1 = ch1 + " is a lowercase character is " + b1; String str2 = ch2 + " is a lowercase character is " + b2; // print b1, b2 values System.out.println( str1 ); System.out.println( str2 ); } } java.lang.Character.isLetterOrDigit(int codePoint) java.lang.Character.isLowerCase(int codePoint)