Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/** 
 *  Copyright (C) 2012  Just Do One More
 *  
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

public class Main {
    public static <K, T> List<T> getOrPutAndGetList(Map<K, List<T>> map, K key) {
        List<T> list = map.get(key);
        if (list == null) {
            list = new ArrayList<T>();
            map.put(key, list);
        }

        return list;
    }
}