Java String Capitalize capitalize(String str)

Description

Capitalize a String, changing the first letter to upper case as per Character#toUpperCase(char) .

License

Open Source License

Parameter

Parameter	Description
str	the String to capitalize, may be <code>null</code>

Return

the capitalized String, null if null

Declaration

public static String capitalize(String str) 

Method Source Code

//package com.java2s;

public class Main {
    /**/*from  w  w w .j  a  v  a 2s  .co m*/
     * Capitalize a <code>String</code>, changing the first letter to
     * upper case as per {@link Character#toUpperCase(char)}.
     * No other letters are changed.
     * @param str the String to capitalize, may be <code>null</code>
     * @return the capitalized String, <code>null</code> if null
     */
    public static String capitalize(String str) {
        return changeFirstCharacterCase(str, true);
    }

    private static String changeFirstCharacterCase(String str, boolean capitalize) {
        if (str == null || str.length() == 0) {
            return str;
        }
        StringBuilder sb = new StringBuilder(str.length());
        if (capitalize) {
            sb.append(Character.toUpperCase(str.charAt(0)));
        } else {
            sb.append(Character.toLowerCase(str.charAt(0)));
        }
        sb.append(str.substring(1));
        return sb.toString();
    }
}

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