Android String Case Convert toLowerCase(String str)

Description

to Lower Case

License

Apache License

Declaration

public static String toLowerCase(String str) 

Method Source Code

//package com.java2s;
/**/*from  www.ja  va2  s  .co m*/
 * Copyright 2013 ??????
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class Main {
    public static final String EMPTY = "";

    public static String toLowerCase(String str) {
        if (str == null) {
            return null;
        }
        return str.toLowerCase();
    }

    public static String toLowerCase(String str, int beginIndex,
            int endIndex) {
        if (str == null) {
            return null;
        }
        StringBuilder sb = new StringBuilder();
        if (beginIndex < 0) {
            beginIndex = 0;
        }
        if (endIndex > str.length()) {
            endIndex = str.length();
        }
        if (beginIndex > 0) {
            sb.append(str.substring(0, beginIndex));
        }
        sb.append(str.substring(beginIndex, endIndex).toLowerCase());
        if (endIndex < str.length()) {
            sb.append(str.substring(endIndex));
        }
        return sb.toString();
    }

    public static String substring(String str, int beginIndex) {
        if (str == null) {
            return null;
        }

        if (beginIndex < 0) {
            return EMPTY;
        }

        if (beginIndex > str.length()) {
            return EMPTY;
        }

        return str.substring(beginIndex);
    }

    public static String substring(String str, int beginIndex, int endIndex) {
        if (str == null) {
            return null;
        }

        if (beginIndex < 0 || endIndex < 0) {
            return EMPTY;
        }

        if (endIndex > str.length()) {
            endIndex = str.length();
        }

        if (beginIndex > endIndex || beginIndex > str.length()) {
            return EMPTY;
        }

        return str.substring(beginIndex, endIndex);
    }
}

Related

1. CoverFirstWordUp(String string)
2. toLowerCase(String src)
3. swapCase(String str)
4. toLowerCase(String str, int beginIndex, int endIndex)
5. toUpperCase(String str)
6. toUpperCase(String str, int beginIndex, int endIndex)
7. endsWithIgnoreCase(String str, String suffix)