Gruppe 3

src/main/java/fizzbuzz/Buzzer.java

@@ -0,0 +1,11 @@
+package fizzbuzz;
+
+public class Buzzer implements Mutator {
+	@Override
+	public String mutate(int number, String prev) {
+		if (number % 7 == 0) {
+			return prev + "Buzz";
+		}
+		return prev;
+	}
+}

src/main/java/fizzbuzz/Fallback.java

@@ -0,0 +1,11 @@
+package fizzbuzz;
+
+public class Fallback implements Mutator {
+	@Override
+	public String mutate(int number, String prev) {
+		if (prev == null || prev.isBlank()) {
+			return String.valueOf(number);
+		}
+		return prev;
+	}
+}

src/main/java/fizzbuzz/FizzBuzz.java

@@ -3,16 +3,27 @@
 
 package fizzbuzz;
 
+import java.util.*;;
+
 public class FizzBuzz {
 
+	private final List<Mutator> mutators = new ArrayList<>();
+
+	public FizzBuzz() {
+		this(List.of(new Fizzer(), new Buzzer()));
+	}
+
+	public FizzBuzz(List<Mutator> mutators) {
+		mutators.addAll(mutators);
+		mutators.add(new Fallback());
+	}
+
 	public String translate(int number) {
-		if (((number % 5) == 0) && ((number % 7) == 0)) // A multiple of both?
-			return "FizzBuzz";
-		else if ((number % 5) == 0)
-			return "Fizz"; // else a multiple of 5?
-		else if ((number % 7) == 0)
-			return "Buzz"; // else a multiple of 7?
-		else
-			return String.valueOf(number); // else just print it
+		String result = "";
+		for (var mutator : mutators) {
+			result = mutator.mutate(number, result);
+		}
+		return result;
 	}
+
 }

src/main/java/fizzbuzz/Fizzer.java

@@ -0,0 +1,11 @@
+package fizzbuzz;
+
+public class Fizzer implements Mutator {
+	@Override
+	public String mutate(int number, String prev) {
+		if (number % 5 == 0) {
+			return prev + "Fizz";
+		}
+		return prev;
+	}
+}

src/main/java/fizzbuzz/Mutator.java

@@ -0,0 +1,7 @@
+package fizzbuzz;
+
+public interface Mutator {
+
+	String mutate(int number, String prev);
+
+}