feat: add Lab4

Lab1/Simulation.java

@@ -0,0 +1,20 @@
+/**
+ * This class is a general abstract class that
+ * encapsulates a simulation. To implement a
+ * simulation, inherit from this class and implement
+ * the `getInitialEvents` method.
+ *
+ * @author Yadunand Prem
+ * @version CS2030S AY22/23 Semester 2
+ */
+abstract class Simulation {
+  /**
+   * An abstract method to return an array of events
+   * used to initialize the simulation.
+   *
+   * @return An array of initial events that the
+   *         simulator can use to kick-start the
+   *         simulation.
+   */
+  public abstract Event[] getInitialEvents();
+}