从完全合格的类名称中提取程序包名称

/*

 * Copyright (c) 2015, WSO2 Inc. (http://www.wso2.org) All Rights Reserved.

 *

 * 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.

 *///nowjava - 时  代  Java 提供

//package com.nowjava;


public class Main {



    private static final String DOT_SEPARATOR = ".";

    private static final int STARTING_INDEX = 0;


    /**

     * Extracts package name from a fully qualified class name

     * For example, when 'org.wso2.developerStudio.Test' is given as an argument, it will return 'org.wso2.developerStudio'

     */

    public static String extractPackageName(String fullyQualified