Java List Create getOrCreateList(Map> map, K key)

Here you can find the source of getOrCreateList(Map> map, K key)

Description

get Or Create List

License

Apache License

Declaration

public static <K, T> List<T> getOrCreateList(Map<K, List<T>> map, K key)

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.util.*;

public class Main {
    public static <K, T> List<T> getOrCreateList(Map<K, List<T>> map, K key) {
        List<T> set = map.get(key);
        if (set == null) {
            set = new ArrayList<T>();
            map.put(key, set);/*from w ww.  j  a  v  a2  s .  c o m*/
        }
        return set;
    }
}

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