app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java

@@ -3,4 +3,5 @@ package ch.zhaw.projekt2.turnierverwaltung;
 public interface Participant {
     String getName();
     void setName(String name);
+    boolean equals(Participant participant);
 }

app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java

@@ -18,4 +18,10 @@ public class Player extends Person implements Participant{
     public void setDateOfBirth(Date dateOfBirth) {
         this.dateOfBirth = dateOfBirth;
     }
+
+    @Override
+    public boolean equals(Participant participant) {
+        return getClass().equals(participant.getClass()) && getName().equals(participant.getName()) &&
+                getFirstName().equals(((Player) participant).getFirstName());
+    }
 }

app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java

@@ -27,6 +27,11 @@ public class Team implements Participant {
         this.name = name;
     }
 
+    @Override
+    public boolean equals(Participant participant) {
+        return getClass().equals(participant.getClass()) && name.equals(participant.getName());
+    }
+
     public Person getContactPerson() {
         return contactPerson;
     }

app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java

@@ -4,11 +4,14 @@ import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 
 import java.io.Serializable;
+import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.List;
 
 public class Tournament implements Serializable {
     private String name;
     private Type type;
+    private List<Participant> participants;
 
 
 
@@ -21,6 +24,22 @@ public class Tournament implements Serializable {
 
         setName(name);
         setType(type);
+        participants = new ArrayList<>();
+    }
+
+    public void addParticipant(Participant newParticipant) throws ParticipantExistsException {
+        for(Participant participant : participants){
+            if(participant.equals(newParticipant)){
+                throw new ParticipantExistsException("A Participant with the same Name exists already.");
+            }
+        }
+        participants.add(newParticipant);
+    }
+
+    public void removeParticipant(Participant participant) throws ParticipantNotExistsException {
+        if(!participants.contains(participant)){
+            throw new ParticipantNotExistsException("The given Participant is not part of this Tournament");
+        }
     }
 
     public String getName() {
@@ -82,5 +101,27 @@ public class Tournament implements Serializable {
 
     }
 
+    public class ParticipantExistsException extends Exception {
+        public ParticipantExistsException() {
+            super();
+        }
+
+        public ParticipantExistsException(String errorMessage) {
+            super(errorMessage);
+        }
+
+    }
+
+    public class ParticipantNotExistsException extends Exception {
+        public ParticipantNotExistsException() {
+            super();
+        }
+
+        public ParticipantNotExistsException(String errorMessage) {
+            super(errorMessage);
+        }
+
+    }
+
 
 }