Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.util.*;

public class Main {
    /**
     * Sort a map by supplied comparator logic.
     *
     * @return new instance of {@link LinkedHashMap} contained sorted entries of supplied map.
     * @author Maxim Veksler
     */
    public static <K, V> LinkedHashMap<K, V> sortMap(final Map<K, V> map,
            final Comparator<Map.Entry<K, V>> comparator) {
        // Convert the map into a list of key,value pairs.
        List<Map.Entry<K, V>> mapEntries = new LinkedList<Map.Entry<K, V>>(map.entrySet());

        // Sort the converted list according to supplied comparator.
        Collections.sort(mapEntries, comparator);

        // Build a new ordered map, containing the same entries as the old map.
        LinkedHashMap<K, V> result = new LinkedHashMap<K, V>(map.size() + (map.size() / 20));
        for (Map.Entry<K, V> entry : mapEntries) {
            // We iterate on the mapEntries list which is sorted by the comparator putting new entries into
            // the targeted result which is a sorted map.
            result.put(entry.getKey(), entry.getValue());
        }

        return result;
    }
}