Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.ArrayList;

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

public class Main {
    /**
     * This method allows you to add a value to a list that is contained
     * in a map. If the key is not already in the map it is create and a
     * new (@link ArrayList} is started.  
     * @param mapArrayList
     * @param key
     * @param value
     */
    public static <K, V> void addToMappedArrayList(Map<K, List<V>> mapArrayList, K key, V value) {

        if (!mapArrayList.containsKey(key)) {
            mapArrayList.put(key, new ArrayList<V>());
        }

        mapArrayList.get(key).add(value);

    }
}