Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/******************************************************************************
 * e-voting system                                                            *
 * Copyright (C) 2016 DSX Technologies Limited.                               *
 * *
 * 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 2 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 can find copy of the GNU General Public License in LICENSE.txt file    *
 * at the top-level directory of this distribution.                           *
 * *
 * Removal or modification of this copyright notice is prohibited.            *
 * *
 ******************************************************************************/

import java.util.Map;
import java.util.function.Supplier;

public class Main {
    public static <K, V> V getOrAdd(Map<K, V> map, K key, Supplier<V> constructor) {
        V value = map.get(key);
        if (value == null) {
            value = constructor.get();
            map.put(key, value);
        }
        return value;
    }
}