Java: Sorting a Map by Values

Here's a simple (TestNG) test to demonstrate getting a List of values out of a Map where you'd like the contents to be ordered by Value (not Key)

package com.alexbleasdale.example;

import java.text.MessageFormat;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.log4j.Logger;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

/**
 * Sorting a Map<String,Long> by Values
 * 
 * @author ableasdale
 * 
 */
public class TestOrderingMapItems {

 private static final Logger LOG = Logger
   .getLogger(TestOrderingMapItems.class);
 private Map<String, Long> map;

 @BeforeClass
 public void setUpOnce() throws Exception {
  LOG.info("Set up");
  map = new HashMap<String, Long>();
  map.put("A", 5L);
  map.put("B", 4L);
  map.put("C", 10L);
  map.put("D", 6L);
 }

 @Test
 public void getItemsByKeyInOrder() throws Exception {
  List<Map.Entry<String, Long>> resultList = new LinkedList<Map.Entry<String, Long>>(
    map.entrySet());

  Collections.sort(resultList, new Comparator<Object>() {
   public int compare(Object o1, Object o2) {
    // Switch o2 and o1 to order from lowest to highest
    return ((Comparable<Object>) ((Map.Entry<?, ?>) (o2))
      .getValue()).compareTo(((Map.Entry<?, ?>) (o1))
      .getValue());

   }
  });

  LOG.info("Ordered list as follows:");
  for (Object e : resultList) {
   LOG.info(MessageFormat.format("{0} | {1}", ((Entry<?, ?>) e).getKey(), ((Entry<?, ?>) e).getValue()));
  }
 }
}