this.listPlayers = new ArrayList<>();

Week 4: Writing classes/17. Football match, part 2: Class Team

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+Let's continue the implementation by implementing a class that models one team.
+
+So, write a (non-public) class Team with the following properties:
+Attribute 'name' (string)
+Some attribute to store the players in
+A constructor that takes the name as a parameter
+Set and get methods for the name
+Method addPlayer(Player p), which adds one player to the team
+The method printPlayers(), which prints the players in the order of addition as shown in the example below (first the number, then the name):
+
+Example output of players:
+7. Pele
+8. Ronaldo
+
+
+
+
+
+================
+
+
+
+import java.util.Random;
+import java.lang.reflect.Field;
+import java.util.ArrayList;
+import java.util.HashMap;
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        
+        
+       System.out.println("Testing class Team...");
+       
+       Team t = new Team("FC Turku");
+       
+       System.out.println("Team object created!");
+       
+       try {
+           Field name = t.getClass().getDeclaredField("name");
+           boolean namePrivate = name.getModifiers() == 2;
+           System.out.println("Name is private: " + namePrivate);
+       } catch (Exception e) {
+           System.out.println("Attribute name is not defined");
+       }
+              
+       System.out.println("Testing get methods...");
+       System.out.println("Name: " + t.getName());
+       
+       System.out.println("Testing set methods...");
+       t.setName("University Football Club");
+       System.out.println("Name: " + t.getName());
+      
+       System.out.println("Adding players to the team...");
+       Player p1 = new Player(7, "Ronaldo");
+       Player p2 = new Player(10, "Pele");
+       
+       
+       t.addPlayer(p1);
+       t.addPlayer(p2);
+       
+       System.out.println("Players added!");
+       System.out.println("Printing players:");
+       t.printPlayers();
+       
+       Player p3 = new Player(34, "Brad Baller");
+       t.addPlayer(p3);
+       System.out.println("Players added!");
+       System.out.println("Printing players:");
+       t.printPlayers();
+       
+    }
+}
+
+
+//ADD
+class Team {
+    // attributes
+    private String name;
+    private ArrayList<Player> listPlayers;
+
+
+    //constructor
+    public Team(String name) {
+        this.name = name;
+        // need to initialise empty array, otherwise 'NullPointerException'
+        this.listPlayers = new ArrayList<>();
+    }
+
+    public String getName() {
+        return this.name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void addPlayer(Player p) {
+        this.listPlayers.add(p);
+    }
+
+    public void printPlayers() {
+        // int counter = 0;
+        
+        for (Player p: listPlayers) {
+            // counter+=1;
+            // System.out.println(counter + ". " + p.getName());
+            // a player has their own number, dont use 'counter'
+            System.out.println(p.getNumber() + ". " + p.getName());
+        }
+    }
+
+    
+}
+
+
+
+
+Testing class Team...
+Team object created!
+Name is private: true
+Testing get methods...
+Name: FC Turku
+Testing set methods...
+Name: University Football Club
+Adding players to the team...
+Players added!
+Printing players:
+7. Ronaldo
+10. Pele
+Players added!
+Printing players:
+7. Ronaldo
+10. Pele
+34. Brad Baller
+