Java String Camel Case to Underscore camelCaseToUnderScore(String key)

Description

camel Case To Under Score

License

Apache License

Declaration

public static final String camelCaseToUnderScore(String key) 

Method Source Code

//package com.java2s;
/*//ww w  .  j a v  a  2s .c o  m
 *  Licensed to GraphHopper GmbH under one or more contributor
 *  license agreements. See the NOTICE file distributed with this work for 
 *  additional information regarding copyright ownership.
 * 
 *  GraphHopper GmbH licenses this file to you 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 camelCaseToUnderScore(String key) {
        if (key.isEmpty())
            return key;

        StringBuilder sb = new StringBuilder(key.length());
        for (int i = 0; i < key.length(); i++) {
            char c = key.charAt(i);
            if (Character.isUpperCase(c))
                sb.append("_").append(Character.toLowerCase(c));
            else
                sb.append(c);
        }

        return sb.toString();
    }

    public static boolean isEmpty(String str) {
        return str == null || str.trim().length() == 0;
    }
}

Related

1. camelCaseToUnderline(String name)
2. camelCaseToUnderscore(final String camelCaseString)
3. camelCaseToUnderscore(final String str)
4. camelCaseToUnderscore(String camelCase)
5. camelCaseToUnderscore(String camelCased)
6. camelCaseToUnderscored(String camelCaseName)
7. camelCaseToUnderscores(String camel)
8. camelCaseToUnderScoreUpperCase(String camelCase)
9. camelToUnder(String value)