Java Map Sort sortByKeys( Map map)

Description

sort By Keys

License

Open Source License

Declaration

public static <K extends Comparable<? super K>, V> Map<K, V> sortByKeys(
            Map<K, V> map) 

Method Source Code

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

import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class Main {
    public static <K extends Comparable<? super K>, V> Map<K, V> sortByKeys(
            Map<K, V> map) {
        Comparator<Map.Entry<K, V>> comparator = new Comparator<Map.Entry<K, V>>() {
            public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
                return (o1.getKey()).compareTo(o2.getKey());
            }//w w  w . j a va2  s . c o  m
        };

        return sortMapByKeys(map, comparator);
    }

    public static <K extends Comparable<? super K>, V> Map<K, V> sortMapByKeys(
            Map<K, V> map, Comparator<Map.Entry<K, V>> comparator) {
        List<Map.Entry<K, V>> list = new LinkedList<Map.Entry<K, V>>(
                map.entrySet());
        Collections.sort(list, comparator);

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

Related

1. sortByComparatorDouble( final Map map)
2. sortByDescendingValues(Map unsortMap)
3. sortByKey(final Map map, String order)
4. sortByKey(Map map)
5. sortByKey(T map, final boolean descending)
6. sortByKeys(Map map)
7. sortByMap(List> lists)
8. sortByMap(Map map, int size)
9. sortByValue( final Map map)