MyComparator.java Source code

Introduction

Here is the source code for MyComparator.java

Source

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.TreeMap;

class MyComparator implements Comparator<Map.Entry> {
    public int compare(Entry o1, Entry o2) {
        Double valueOne = (Double) o1.getValue();
        Double valueTwo = (Double) o2.getValue();
        return (int) Math.signum(valueOne.compareTo(valueTwo));
    }
}

public class Main {
    public static void main(String[] args) {
        TreeMap tm = new TreeMap();
        tm.put(1, new Double(344.34));
        tm.put(0, new Double(123.22));
        tm.put(4, new Double(138.00));
        tm.put(2, new Double(919.22));
        tm.put(3, new Double(-119.08));

        List<Map.Entry> valueList = new ArrayList(tm.entrySet());
        Collections.sort(valueList, new MyComparator());

        Iterator<Map.Entry> iterator = valueList.iterator();
        while (iterator.hasNext()) {
            Map.Entry entry = iterator.next();
            System.out.println("Value: " + entry.getValue());
        }
    }
}