Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Map;

public class Main {
    /** Merge two map counters. */
    public static <K> void mergeMapCounters(Map<K, Integer> counter1, Map<K, Integer> counter2) {
        for (K key : counter2.keySet()) {
            increaseMapCounter(counter1, key, counter2.get(key));
        }
    }

    /**
     * Increase counter.get(key) by increase.
     * If value decrease to zero, it is removed from map.
     */
    public static <K> void increaseMapCounter(Map<K, Integer> counter, K key, int increase) {
        if (!counter.containsKey(key)) {
            counter.put(key, 0);
        }
        counter.put(key, counter.get(key) + increase);
        if (counter.get(key) == 0) {
            counter.remove(key);
        }
    }
}