Capitalize in Java

Published on 11 October 2019 (Updated: 11 October 2019)

Welcome to the Capitalize in Java page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

public class Capitalize {

    public static boolean isLetter(char someChar) {
        return (someChar >= 'a' && someChar <= 'z') || (someChar >= 'A' && someChar <= 'Z');

    public static boolean isUpperCase(char someChar) {
        return (someChar >= 'A' && someChar <= 'Z');

    public static void main(String[] args) {
        if (args.length == 0 || args[0].equals("")) {
            System.out.println("Usage: please provide a string");
        String sentence = args[0];

        char firstChar = sentence.charAt(0);
        if (isLetter(firstChar) && !isUpperCase(firstChar)) {
            char[] charArray = sentence.toCharArray();
            charArray[0] = Character.toUpperCase(firstChar);
            sentence = new String(charArray);


Capitalize in Java was written by:

If you see anything you'd like to change or update, please consider contributing.

Note: The solution shown above is the current solution in the Sample Programs repository as of Oct 10 2022 15:04:56. The solution was first committed on Oct 11 2019 21:27:34. As a result, documentation below may be outdated.

How to Implement the Solution

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How to Run the Solution

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