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Lab5/cs2030s/fp/Action.java

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+package cs2030s.fp;
+/**
+ * The Action interface that can be called
+ * on an object of type T to act.
+ * Contains a single abstract method call.
+ * CS2030S Lab 4
+ * AY22/23 Semester 1
+ * @author Yadunand Prem (10B)
+ */
+
+public interface Action<T> {
+  void call(T item);
+}

Lab5/cs2030s/fp/Actionable.java

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+package cs2030s.fp;
+/**
+ * The Actionable interface that can
+ * act when given an action.
+ * Contains a single abstract method act.
+ * CS2030S Lab 4
+ * AY22/23 Semester 1
+ * @author Yadunand Prem (10B)
+ */
+
+// act consumes the T and passes it to action, thus super
+public interface Actionable<T> {
+  public void act(Action<? super T> action);
+}

Lab5/cs2030s/fp/Immutator.java

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+package cs2030s.fp;
+/**
+ * The Immutator interface that can transform
+ * to type T2, an object of type T1.
+ * Contains a single abstract method invoke.
+ * CS2030S Lab 4
+ * AY22/23 Semester 1
+ * @author Yadunand Prem (10B)
+ */
+
+public interface Immutator<R, P> {
+  public R invoke(P param);
+}

Lab5/cs2030s/fp/Immutatorable.java

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+package cs2030s.fp;
+/**
+ * The Immutatorable interface that can
+ * transform when given something that is
+ * Immutator.
+ * Contains a single abstract method transform.
+ * CS2030S Lab 4
+ * AY22/23 Semester 1
+ * @author Yadunand Prem (10B)
+ */
+
+public interface Immutatorable<T> {
+  public <R> Immutatorable<R> transform(Immutator<? extends R, ? super T> immutator);
+}