Converts a String to lower case as per String#toLowerCase() - Java java.lang

Java examples for java.lang:String Case

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Description

Converts a String to lower case as per String#toLowerCase()

Demo Code

/*/*from  w w  w  .  ja v a 2  s  . co  m*/
 * Copyright 2013 Guidewire Software, Inc.
 */
/**
 * This class is based, in part, on org.apache.commons.lang.StringUtils and is intended
 * to break the dependency on that project.
 *
 * @author <a href="http://jakarta.apache.org/turbine/">Apache Jakarta Turbine</a>
 * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
 * @author Daniel L. Rall
 * @author <a href="mailto:gcoladonato@yahoo.com">Greg Coladonato</a>
 * @author <a href="mailto:ed@apache.org">Ed Korthof</a>
 * @author <a href="mailto:rand_mcneely@yahoo.com">Rand McNeely</a>
 * @author Stephen Colebourne
 * @author <a href="mailto:fredrik@westermarck.com">Fredrik Westermarck</a>
 * @author Holger Krauth
 * @author <a href="mailto:alex@purpletech.com">Alexander Day Chaffee</a>
 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
 * @author Arun Mammen Thomas
 * @author Gary Gregory
 * @author Phil Steitz
 * @author Al Chou
 * @author Michael Davey
 * @author Reuben Sivan
 * @author Chris Hyzer
 *  Johnson

 */
 
//package com.java2s;

import java.util.Locale;

public class Main {
    public static void main(String[] argv) {
        String str = "java2s.com";
        System.out.println(lowerCase(str));
    }

    /**
     * <p>Converts a String to lower case as per {@link String#toLowerCase()}.</p>
     *
     * <p>A <code>null</code> input String returns <code>null</code>.</p>
     *
     * <pre>
     * lowerCase(null)  = null
     * lowerCase("")    = ""
     * lowerCase("aBc") = "abc"
     * </pre>
     *
     * <p><strong>Note:</strong> As described in the documentation for {@link String#toLowerCase()},
     * the result of this method is affected by the current locale.
     * For platform-independent case transformations, the method {@link #lowerCase(String, Locale)}
     * should be used with a specific locale (e.g. {@link Locale#ENGLISH}).</p>
     *
     * @param str  the String to lower case, may be null
     * @return the lower cased String, <code>null</code> if null String input
     */
    public static String lowerCase(String str) {
        if (str == null) {
            return null;
        }
        return str.toLowerCase();
    }

    /**
     * <p>Converts a String to lower case as per {@link String#toLowerCase(Locale)}.</p>
     *
     * <p>A <code>null</code> input String returns <code>null</code>.</p>
     *
     * <pre>
     * lowerCase(null, Locale.ENGLISH)  = null
     * lowerCase("", Locale.ENGLISH)    = ""
     * lowerCase("aBc", Locale.ENGLISH) = "abc"
     * </pre>
     *
     * @param str  the String to lower case, may be null
     * @param locale  the locale that defines the case transformation rules, must not be null
     * @return the lower cased String, <code>null</code> if null String input
     * @since 3.0
     */
    public static String lowerCase(String str, Locale locale) {
        if (str == null) {
            return null;
        }
        return str.toLowerCase(locale);
    }
}

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