Add: a5 close #9

assignment5/Question4/TrainSpeedChange.java

@@ -0,0 +1,15 @@
+/*
+ * The TrainSpeedChange class is used to test the speed of the program.
+ */
+public class TrainSpeedChange extends Exception {
+	// generate serial ID by class name
+	private static final long serialVersionUID = TrainSpeedChange.class.getName().hashCode();
+
+	public TrainSpeedChange() {
+		super();
+	}
+
+	public TrainSpeedChange(String message) {
+		super(message);
+	}
+}