Java - Write code to Return true if the given string contains at least one uppercase letter.

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Requirements

Write code to Return true if the given string contains at least one uppercase letter.

Demo

/*
 * Copyright (c) 2001-2002, Marco Hunsicker. All rights reserved.
 *
 * This software is distributable under the BSD license. See the terms of the
 * BSD license in the documentation provided with this software.
 *//*w w w . j a  va  2s . co  m*/
 
//package com.book2s;

public class Main {
    public static void main(String[] argv) {
        String str = "This is book2s.com";
        System.out.println(containsUppercase(str));
    }

    /**
     * Returns <code>true</code> if the given string contains at least one uppercase
     * letter.
     *
     * @param str string to check for uppercase letters.
     *
     * @return <code>true</code> if the given string contains at least one uppercase
     *         letter.
     */
    public static boolean containsUppercase(String str) {
        if (str.length() == 0) {
            return false;
        }

        for (int i = 0, size = str.length(); i < size; i++) {
            if (isUppercase(str.charAt(i))) {
                return true;
            }
        }

        return false;
    }

    /**
     * Returns <code>true</code> if the given letter is uppercase.
     *
     * @param letter letter to check for capitalization.
     *
     * @return <code>true</code> if the given letter is uppercase.
     */
    public static boolean isUppercase(char letter) {
        if ((letter < 'A') || (letter > 'Z')) {
            return false;
        }

        return true;
    }
}

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