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

Java examples for java.lang:String Capitalize

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Description

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

Demo Code


//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String str = "java2s.com";
        System.out.println(capitalize(str));
    }/*  w  ww.  j  av  a 2 s  .  c o  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(final String str) {

        return changeFirstCharacterCase(str, true);
    }

    private static String changeFirstCharacterCase(final String str,
            final boolean capitalize) {

        if ((str == null) || (str.length() == 0))
            return str;
        final 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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