Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.util.Collections;
import java.util.Comparator;

import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

public class Main {

    public static <K, V> Map<K, V> sortMapByKey(Map<K, V> map, final Boolean asc) {
        List<Entry<K, V>> entries = new LinkedList<Entry<K, V>>(map.entrySet());
        Collections.sort(entries, new Comparator<Entry<K, V>>() {
            @SuppressWarnings("unchecked")
            public int compare(Entry<K, V> o1, Entry<K, V> o2) {
                if (asc) {
                    return ((Comparable<K>) o1.getKey()).compareTo(o2.getKey());
                } else {
                    return -((Comparable<K>) o1.getKey()).compareTo(o2.getKey());
                }
            }
        });

        Map<K, V> result = new LinkedHashMap<K, V>();
        for (Entry<K, V> entry : entries) {
            result.put(entry.getKey(), entry.getValue());
        }
        return result;
    }
}