Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Open Source License 

import java.util.Map;

public class Main {
    /**
     * Decrements the integer value of the given key. In case the key does not
     * exists, minus one is associated with the given key.
     *
     * @param <T> The type of the keys of the given map.
     * @param map The given map to decrement the given key of.
     * @param key The given key.
     * @return The new value associated with the given key.
     */
    public static <T> int decrementKey(Map<T, Integer> map, T key) {
        return decrementKey(map, key, 0x01);
    }

    /**
     * Decrements the integer value of the given key by the given decrement. In
     * case the given key does not exists, the key is associated with minus the
     * given key.
     *
     * @param <T> The type of the keys of the given map.
     * @param map The given map to decrement the given key of.
     * @param key The given key.
     * @param decrement The value to decrement the value associated to the given
     * key with.
     * @return The new value associated with the given key.
     */
    public static <T> int decrementKey(Map<T, Integer> map, T key, int decrement) {
        return decrementKey(map, key, decrement, -decrement);
    }

    /**
     * Decrements the integer value of the given key by the given increment. In
     * case the given key does not exists, the key is associated with the given
     * default value.
     *
     * @param <T> The type of the keys of the given map.
     * @param map The given map to decrement the given key of.
     * @param key The given key.
     * @param decrement The value to decrement the value associated to the given
     * key with.
     * @param deflt The value to associate the given key with, in case the key
     * is not yet added to the map.
     * @return The new value associated with the given key.
     */
    public static <T> int decrementKey(Map<T, Integer> map, T key, int decrement, int deflt) {
        Integer val = map.get(key);
        if (val == null) {
            val = deflt;
        } else {
            val -= decrement;
        }
        map.put(key, val);
        return val;
    }
}