import java.util.ArrayList;
import java.util.Scanner;
import java.util.Collections;
import java.util.Random;
import java.lang.Math;

public class Homework4 {

public static String nextScore(String currentScore, int server)
{
   String score = "";
   switch(currentScore){

         case "0/0":
            score = (server == 1) ? "15/0" : "0/15";
            break;

         case "0/15":
            score = (server == 1) ? "15/15" : "0/30";
            break;

         case "0/30":
            score = (server == 1) ? "15/30" : "0/40";
            break;

         case "0/40":
            score = (server == 1) ? "15/40" : "game";
            break;

         case "15/0":
            score = (server == 1) ? "30/0" : "15/15";
            break;

         case "15/15":
            score = (server == 1) ? "30/15" : "15/30";
            break;

         case "15/30":
            score = (server == 1) ? "30/30" : "15/40";
            break;

         case "15/40":
            score = (server == 1) ? "30/40" : "game";
            break;

         case "30/0":
            score = (server == 1) ? "40/0" : "30/15";
            break;

         case "30/15":
            score = (server == 1) ? "40/15" : "30/30";
            break;

         case "30/30":
            score = (server == 1) ? "40/30" : "30/40";
            break;

         case "30/40":
            score = (server == 1) ? "deuce" : "game";
            break;

         case "40/0":
            score = (server == 1) ? "game" : "40/15";
            break;

         case "40/15":
            score = (server == 1) ? "game" : "40/30";
            break;

         case "40/30":
            score = (server == 1) ? "game" : "deuce";
            break;

         case "deuce":
            score = (server == 1) ? "advantage" : "advantage";
            break;

         case "advantage":
            score = (server == 1) ? "game" : "deuce";
            break;
   }

   return score;
}

Background: Imagine a school with 10 students, each with their own...