Java String Capitalize capitalize(String str)

Description

Capitalizes a String changing the first letter to title case as per Character#toTitleCase(char) .

License

BSD License

Parameter

Parameter	Description
str	the String to capitalize, may be null

Return

the capitalized String, null if null String input

Declaration

public static String capitalize(String str) 

Method Source Code

//package com.java2s;
/*// w  w  w.j a v a2  s. c o  m
 * [The "BSD licence"]
 * Copyright (c) 2013-2015 Dandelion
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Dandelion nor the names of its contributors 
 * may be used to endorse or promote products derived from this software 
 * without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

public class Main {
    /**
     * <p>
     * Capitalizes a String changing the first letter to title case as per
     * {@link Character#toTitleCase(char)}. No other letters are changed.
     * </p>
     * 
     * <pre>
     * StringUtils.capitalize(null)  = null
     * StringUtils.capitalize("")    = ""
     * StringUtils.capitalize("cat") = "Cat"
     * StringUtils.capitalize("cAt") = "CAt"
     * </pre>
     * 
     * @param str
     *           the String to capitalize, may be null
     * @return the capitalized String, <code>null</code> if null String input
     * @see #uncapitalize(String)
     * @since 2.0
     */
    public static String capitalize(String str) {
        if (str == null) {
            return null;
        }
        StringBuilder result = new StringBuilder(str.toString());
        if (result.length() > 0) {
            result.setCharAt(0, Character.toTitleCase(result.charAt(0)));
        }
        return result.toString();

    }
}

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