Main.java Source code

Introduction

Here is the source code for Main.java

Source

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

public class Main {
    public static void main(String[] args) {
        Map<String, String> unsortMap = new HashMap<String, String>();
        unsortMap.put("1", "1");
        unsortMap.put("2", "A");
        unsortMap.put("3", "2");
        Iterator iterator = unsortMap.entrySet().iterator();
        for (Map.Entry entry : unsortMap.entrySet()) {
            System.out.println("Key : " + entry.getKey() + " Value : " + entry.getValue());
        }
        Map<String, String> sortedMap = sortByComparator(unsortMap);
        for (Map.Entry entry : sortedMap.entrySet()) {
            System.out.println("Key : " + entry.getKey() + " Value : " + entry.getValue());
        }
    }

    private static Map sortByComparator(Map unsortMap) {
        List list = new LinkedList(unsortMap.entrySet());
        Collections.sort(list, new Comparator() {
            public int compare(Object o1, Object o2) {
                return ((Comparable) ((Map.Entry) (o1)).getValue()).compareTo(((Map.Entry) (o2)).getValue());
            }
        });
        Map sortedMap = new LinkedHashMap();
        for (Iterator it = list.iterator(); it.hasNext();) {
            Map.Entry entry = (Map.Entry) it.next();
            sortedMap.put(entry.getKey(), entry.getValue());
        }
        return sortedMap;
    }
}