In this program, we are going to determine if the given character is Uppercase or Lowercase alphabet. We have two different approaches:
- Using ASCII value range
- Using Character class
See also: Find ASCII value of a character
Using ASCII value range
If the ASCII value of a character lies between 65 (A) to 90 (Z) then it is an uppercase character or if the character’s ASCII value lies between 97 (a) to 122 (z) then it is a lowercase character.
See the flow diagram:
Program
import java.util.Scanner;
public class LowerUpperCase {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter any caracter : ");
char ch = scanner.next().charAt(0);
if(ch >= 'A' && ch <= 'Z') {
System.out.println(ch + " is UPPERCASE alphabet.");
} else if(ch >= 'a' && ch <= 'z') {
System.out.println(ch + " is LOWERCASE alphabet.");
} else {
System.out.println(ch + " is not an alphabet.");
}
}
}Output
Enter any caracter : k
k is LOWERCASE alphabet.
Using Character class
Java has built-in wrapper class Character available in java.lang package. Here we are using static class isUpperCase() and isLowerCase() of Character class to determine the alphabet case.
Program
import java.util.Scanner;
public class LowerUpperCase {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("Enter any caracter : ");
char ch = scanner.next().charAt(0);
// Using character class
if (Character.isUpperCase(ch)) {
System.out.println(ch + " is UPPERCASE alphabet.");
} else if (Character.isLowerCase(ch)) {
System.out.println(ch + " is LOWERCASE alphabet.");
} else {
System.out.println(ch + " is not an alphabet.");
}
}
}Output
Enter any caracter : K
K is UPPERCASE alphabet.