Calculate the Total Amount of Points using Java

The challenge

Our football team finished the championship. The result of each match look like “x:y”. Results of all matches are recorded in the collection.

For example: ["3:1", "2:2", "0:1", ...]

Write a function that takes such collection and counts the points of our team in the championship. Rules for counting points for each match:

  • if x>y – 3 points
  • if x<y – 0 point
  • if x=y – 1 point

Notes:

  • there are 10 matches in the championship
  • 0 <= x <= 4
  • 0 <= y <= 4

Test cases

import org.junit.Test; import static org.junit.Assert.assertEquals; import org.junit.runners.JUnit4; public class SolutionTest { @Test public void basicTests() { assertEquals(30, TotalPoints.points(new String[] {"1:0","2:0","3:0","4:0","2:1","3:1","4:1","3:2","4:2","4:3"})); assertEquals(10, TotalPoints.points(new String[] {"1:1","2:2","3:3","4:4","2:2","3:3","4:4","3:3","4:4","4:4"})); assertEquals(0, TotalPoints.points(new String[] {"0:1","0:2","0:3","0:4","1:2","1:3","1:4","2:3","2:4","3:4"})); assertEquals(15, TotalPoints.points(new String[] {"1:0","2:0","3:0","4:0","2:1","1:3","1:4","2:3","2:4","3:4"})); assertEquals(12, TotalPoints.points(new String[] {"1:0","2:0","3:0","4:4","2:2","3:3","1:4","2:3","2:4","3:4"})); } }
Code language: Java (java)

The solution in Java

Option 1:

public class TotalPoints { public static int points(String[] games) { int points = 0; for (String item: games) { int x = (int) item.charAt(0); int y = (int) item.charAt(2); if (x>y) points += 3; else if (x==y) points ++; } return points; } }
Code language: Java (java)

Option 2 (using a stream):

import java.util.Arrays; public class TotalPoints { public static int points(String[] games) { return Arrays.stream(games) .mapToInt(score -> score.charAt(0) - score.charAt(2)) .map(match -> match > 0 ? 3 : match == 0 ? 1 : 0) .sum(); } }
Code language: Java (java)
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