Java String Camel Case to Underscore camelToUnderscore(String value)

Description

Convert a string from camel case to underscores, also replacing periods with underscores (so for example a fully qualified Java class name gets underscores everywhere).

License

Open Source License

Parameter

Parameter	Description
value	a camel case String

Return

the same value with camels comverted to underscores

Declaration

public static String camelToUnderscore(String value)

Method Source Code

//package com.java2s;
/*/*from   w  w w.  j  av  a 2 s.  co  m*/
 * Cloud Foundry 2012.02.03 Beta
 * Copyright (c) [2009-2012] VMware, Inc. All Rights Reserved.
 *
 * This product is licensed to you under the Apache License, Version 2.0 (the "License").
 * You may not use this product except in compliance with the License.
 *
 * This product includes a number of subcomponents with
 * separate copyright notices and license terms. Your use of these
 * subcomponents is subject to the terms and conditions of the
 * subcomponent's license, as noted in the LICENSE file.
 */

public class Main {
    /**
     * Convert a string from camel case to underscores, also replacing periods with underscores (so for example a fully
     * qualified Java class name gets underscores everywhere).
     * 
     * @param value a camel case String
     * @return the same value with camels comverted to underscores
     */
    public static String camelToUnderscore(String value) {
        String result = value.replace(" ", "_");
        result = result.replaceAll("([a-z])([A-Z])", "$1_$2");
        result = result.replace(".", "_");
        result = result.toLowerCase();
        return result;
    }
}