Java tutorial
//package com.java2s; //License from project: Open Source License import java.util.Map; import java.util.Map.Entry; public class Main { public static <TKey extends TKeyT, TKeyT> Map<? super TKey, Integer> mergeMapWithAdd(Map<TKeyT, Integer> target, Map<? extends TKey, ? extends Integer> source) { for (Entry<? extends TKey, ? extends Integer> entry2 : source.entrySet()) { TKey key2 = entry2.getKey(); int val2 = entry2.getValue(); if (target.containsKey(key2)) { int val1 = target.get(key2); target.put(key2, val1 + val2); } else { target.put(key2, val2); } } return target; } }