ThreeMap - A hash map with three arguments.

ThreeMap.java

import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Set;

/**
 * <p/>
 * The MIT License (MIT)
 * <p/>
 * Copyright (c) 2015 Tarun Boddupalli
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
public class ThreeMap<K, V, E> {

    private LinkedList<ThreeEntrySet<K, V, E>> entries = new LinkedList<>();

    public void put(K key, V value1, E value2) {
        for (ThreeEntrySet<K, V, E> set : entries) {
            if (set.getKey().equals(key)) {
                set.setKey(key);
                set.setFirstVal(value1);
                set.setSecondVal(value2);
                return;
            }
        }
        entries.add(new ThreeEntrySet<>(key, value1, value2));
    }

    public void remove(K key) {
        ThreeEntrySet<K, V, E> tempSet = null;
        for (ThreeEntrySet<K, V, E> set : entries) {
            if (set.getKey().equals(key)) {
                tempSet = set;
            }
        }
        entries.remove(tempSet);
    }

    public ThreeEntrySet<K, V, E> get(K key) {
        for (ThreeEntrySet<K, V, E> set : entries) {
            if (set.getKey().equals(key)) {
                return set;
            }
        }
        return null;
    }

    public LinkedList<ThreeEntrySet<K, V, E>> entrySet() {
        return entries;
    }

    public static class ThreeEntrySet<K, V, E> {

        private K key;
        private V firstVal;
        private E secondVal;

        public ThreeEntrySet(K key, V firstVal, E secondVal) {
            this.key = key;
            this.firstVal = firstVal;
            this.secondVal = secondVal;
        }

        public K getKey() {
            return key;
        }

        public void setKey(K key) {
            this.key = key;
        }

        public V getFirstVal() {
            return firstVal;
        }

        public void setFirstVal(V firstVal) {
            this.firstVal = firstVal;
        }

        public E getSecondVal() {
            return secondVal;
        }

        public void setSecondVal(E secondVal) {
            this.secondVal = secondVal;
        }
    }

}