Odtnhj

I'm creating a console game in Java. And I want to keep track of the scores and names.

I've already created two arrays.

String PlayerNames = "Bob", "Rick", "Jack"; // just an example
int PlayerScores = 40, 20, 60; // just an example

I want to sort their scores, but also know who the score belongs to, and then print it out like this:

 Jack 60
 Bob 40 
 Rick 20

Create a map with the player names as the keys and the scores as the values, then sort the map based on the values:

public static void main(String args) 
 Map<String, Integer> unsortedMap = new HashMap<String, Integer>();
 unsortedMap.put("Jack", 60);
 unsortedMap.put("Bob", 40);
 unsortedMap.put("Rick", 20);

 Map<String, Integer> sortedMap = sortByValue(unsortedMap);
 printMap(sortedMap);


private static Map<String, Integer> sortByValue(Map<String, Integer> unsortMap) 

 // 1. Convert Map to List of Map
 List<Map.Entry<String, Integer>> list =
 new LinkedList<Map.Entry<String, Integer>>(unsortMap.entrySet());

 // 2. Sort list with Collections.sort(), provide a custom Comparator
 // Try switch the o1 o2 position for a different order
 Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() 
 public int compare(Map.Entry<String, Integer> o1,
 Map.Entry<String, Integer> o2) 
 return (o1.getValue()).compareTo(o2.getValue());
 
 );

 // 3. Loop the sorted list and put it into a new insertion order Map LinkedHashMap
 Map<String, Integer> sortedMap = new LinkedHashMap<String, Integer>();
 for (Map.Entry<String, Integer> entry : list) 
 sortedMap.put(entry.getKey(), entry.getValue());
 

 /*
 //classic iterator example
 for (Iterator<Map.Entry<String, Integer>> it = list.iterator(); it.hasNext(); ) 
 Map.Entry<String, Integer> entry = it.next();
 sortedMap.put(entry.getKey(), entry.getValue());
 */


 return sortedMap;


public static <K, V> void printMap(Map<K, V> map) 
 for (Map.Entry<K, V> entry : map.entrySet()) 
 System.out.println("Key : " + entry.getKey()
 + " Value : " + entry.getValue());
 

Note: see https://www.mkyong.com/java/how-to-sort-a-map-in-java/ for more details.

You can use a hashmap for this. Use each name from playerNames as a key and create a list for the values (in case two or more players with the same name get a score). A hashmap allows only one value per key, which is why you should create a list of integers for the scores.

Map<String, List<Integer>> scoreboard = new HashMap<>();