Check ASCII 7-Bit Alphabetic Lowercase in Java

In this article, we'll learn how to check whether the entered value is ASCII 7-bit alphabetic lowercase in Java. In ASCII, the lowercase alphabets begin with the character ?a' and end with ?z'. We will write a program checking whether a character is a lowercase alphabetic character using a simple if-else statement.

Problem Statement

We are given a character, and we need to create a Java program that checks whether the character is a lowercase letter in the ASCII 7-bit range, meaning it falls between 'a' and 'z'. We will also check if the character is uppercase, meaning it falls between 'A' and 'Z'. It will print whether the character is a lowercase letter, an uppercase letter, or neither.

Input 1

char one = 'm';

Character: m

Given character is in lowercase!

Input 2

char one = 'N';

Character: N

Given character is not in lowercase!

Different approaches

• Checking a lowercase ASCII letter
• Checking an uppercase ASCII letter

Checking a lowercase ASCII letter

The following are the steps to check if a character is a lowercase ASCII letter ?

• Define the character variable and assign the value 'm'.
  
• Use an if-else statement to check if the character is between 'a' and 'z'.
  
• If true, print that the character is in lowercase.

Example

Below is a Java program to check if a character is a lowercase ASCII letter ?

public class Demo {
	public static void main(String []args) {
		char one = 'm';
		System.out.println("Character: "+one);
		if (one >= 'a' && one <= 'z') {
			System.out.println("Given character is in lowercase!");
		} else {
			System.out.println("Given character is not in lowercase!");
		}
	}
}

Output

Character: m
Given character is in lowercase!

Checking an Uppercase ASCII Letter

The following are the steps to check if a character is an uppercase ASCII letter ?

• Define the character variable and assign the value 'N'.
  
• Use an if-else statement to check if the character is between 'a' and 'z'.
  
• If false, print that the character is not in lowercase.

Example

Below is a Java program to check if a character is an uppercase ASCII letter ?

public class Demo {
	public static void main(String []args) {
		char one = 'N';
		System.out.println("Character: "+one);
		if (one >= 'a' && one <= 'z') {
			System.out.println("Given character is in lowercase!");
		} else {
			System.out.println("Given character is not in lowercase!");
		}
	}
}

Output

Character: N
Given character is not in lowercase!