Java String Lower Case toLowerCase(String str)

Description

to Lower Case

License

Open Source License

Declaration

public static String toLowerCase(String str) 

Method Source Code

//package com.java2s;
/*/*from  w  w  w  .  j  a va 2 s .c o  m*/
 * JBoss, Home of Professional Open Source.
 *
 * See the LEGAL.txt file distributed with this work for information regarding copyright ownership and licensing.
 *
 * See the AUTHORS.txt file distributed with this work for a full listing of individual contributors.
 */

public class Main {
    public static String toLowerCase(String str) {
        String newStr = convertBasicLatinToLower(str);
        if (newStr == null) {
            return str.toLowerCase();
        }
        return newStr;
    }

    private static String convertBasicLatinToLower(String str) {
        char[] chars = str.toCharArray();
        for (int i = 0; i < chars.length; i++) {
            if (isBasicLatinUpperCase(chars[i])) {
                chars[i] = (char) ('a' + (chars[i] - 'A'));
            } else if (!isBasicLatinChar(chars[i])) {
                return null;
            }
        }
        return new String(chars);
    }

    private static boolean isBasicLatinUpperCase(char c) {
        return c >= 'A' && c <= 'Z';
    }

    private static boolean isBasicLatinChar(char c) {
        return c <= '\u007F';
    }
}

Related

1. toLowerCase(String source)
2. toLowerCase(String str)
3. toLowerCase(String str)
4. toLowerCase(String str)
5. toLowerCase(String str)
6. toLowerCase(String str)
7. toLowerCase(String string)
8. toLowerCase(String string)
9. toLowerCase(String text)