Java examples on java.lang

How do I know if a character is lowercase?

In this example you'll learn another example on using the Character class. The Character.isLowerCase() method can be use to determine if a letter is a lowercase letter. This method takes a char as argument and return a boolean value. If it returns true it means the character is in lowercase form. And if it returns false it means the character is not in lowercase form.

Besides using the isLowerCase() method you can also compare the character type with the constant value of Character.LOWERCASE_LETTER. To get the character type you can use the Character.getType() method. You can see the example on the following code snippet.

package org.kodejava.example.lang;

public class CharacterIsLowerCase {
    public static void main(String[] args) {
        char a = 'a';

        //
        // Checks to see if a letter is a lowercase letter.
        //
        if (Character.isLowerCase(a)) {
            System.out.println(a + " is a lowercase character.");
        }

        //
        // Checks to see if a letter is a lowercase letter
        // by comparing the character type against
        // Character.LOWERCASE_LETTER constant value.
        //
        int charType = Character.getType(a);
        if (charType == Character.LOWERCASE_LETTER) {
            System.out.println(a + " is a lowercase character.");
        }
    }
}

This example give you the following output:

a is a lowercase character.
a is a lowercase character.