Java String Camel Case to Underscore camelCaseToUnderline(String name)

Description

camel Case To Underline

License

Apache License

Declaration

public static String camelCaseToUnderline(String name) 

Method Source Code

//package com.java2s;
/*/* ww  w .j  a  va 2s  .c om*/
 * Copyright 2011 Christian Essl
 *
 * 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 String camelCaseToUnderline(String name) {
        final int length = name.length();
        boolean inupper = false;
        StringBuilder stb = new StringBuilder(length);
        int i = 0;
        while (i < length) {
            char c = name.charAt(i);
            i = i + 1;
            if (inupper) {
                if (Character.isLowerCase(c)) {
                    stb.append(c);
                    inupper = false;
                } else if (i < length && Character.isUpperCase(c)
                        && Character.isLowerCase(name.charAt(i))) {
                    stb.append('_');
                    stb.append(Character.toLowerCase(c));
                    inupper = false;
                } else {
                    stb.append(Character.toLowerCase(c));
                }
            } else {
                if (Character.isUpperCase(c)) {
                    stb.append('_');
                    stb.append(Character.toLowerCase(c));
                    inupper = true;
                } else {
                    stb.append(c);
                }
            }
        }
        return stb.toString();
    }
}

Related

1. camelCase2UnderScoreCase(String str)
2. camelCase2UnderscoreLowercase(String name)
3. camelCaseToLowerCaseUnderline(String name)
4. camelCaseToUnderscore(final String camelCaseString)
5. camelCaseToUnderscore(final String str)
6. camelCaseToUnderscore(String camelCase)
7. camelCaseToUnderscore(String camelCased)