A HashMap holds the points scored (value) for each player (key) in game 1. A sim

Question

A HashMap holds the points scored (value) for each player (key) in game 1. A similar HashMap holds the points scored for each player in game 2. For example: Do the following: Create a package named. "prob2" and a class named, "Games". Write a method named getTotals that accepts two HashMaps as described above and returns a TreeMap of all the players that played in both games and the total number of points they got. For the example above, the result is: Write a main with the maps above, call getTotals, and print the resulting TreeMap as shown immediately above.

Explanation / Answer

package prob2;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

/**
* @author srinu
*
*/
public class Game {

   /**
   * method to return treemap of all the players that played in both games and
   * total number of points they got
   *
   * @param game1
   * @param game2
   * @return
   */
   public static TreeMap<String, Integer> getTotals(
           HashMap<String, Integer> game1, HashMap<String, Integer> game2) {

       TreeMap<String, Integer> totalScore = new TreeMap<String, Integer>();

       Set<String> intersectKeys = game1.keySet();
       intersectKeys.retainAll(game2.keySet());

       for (String key : intersectKeys) {
           totalScore.put(key, game1.get(key) + game2.get(key));

       }
       return totalScore;

   }

   public static void main(String[] args) {
       try {
           // declare and initialize the game1 scores
           HashMap<String, Integer> game1 = new HashMap<String, Integer>();
           game1.put("Chen", 4);
           game1.put("Allie", 9);
           game1.put("Reece", 4);
           game1.put("Skuye", 6);
           game1.put("Meshel", 6);

           // declare and initialize the game2 scores
           HashMap<String, Integer> game2 = new HashMap<String, Integer>();
           game2.put("Chen", 8);
           game2.put("Zyrene", 4);
           game2.put("Skuye", 2);
           game2.put("Meshel", 3);

           // calling gettotals() by passing game1 and game2
           TreeMap<String, Integer> totalScores = getTotals(game1, game2);
           // iterating totalScores
           for (Map.Entry<String, Integer> entry : totalScores.entrySet()) {
               System.out.println("Key = " + entry.getKey() + ", Value = "
                       + entry.getValue());
           }

       } catch (Exception e) {
           // TODO: handle exception
       }
   }
}

OUTPUT:

Key = Chen, Value = 12
Key = Meshel, Value = 9
Key = Skuye, Value = 8

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