59 lines
1.2 KiB
Java
59 lines
1.2 KiB
Java
/*
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* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
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* Date: 2022-04-24
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* Description: ManyVehicles class manipulate many vehicles
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*/
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import java.util.ArrayList;
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public class ManyVehicles {
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private ArrayList<Vehicle> vehicles;
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/**
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* Constructor.
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*/
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public ManyVehicles() {
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// initialise instance variables
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vehicles = new ArrayList<Vehicle>();
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}
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/**
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* Add any kind of vehicle to the arraylist.
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*
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* @param v the vehicle to be added
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*/
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public void addVehicle(Vehicle v) {
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vehicles.add(v);
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}
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/**
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* Calculate the avergae speed of all vehicles.
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*
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* @return the average speed of all vehicles
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*/
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public double averageSpeed() {
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double totalSpeed = 0;
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for (Vehicle v : vehicles) {
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totalSpeed += v.getSpeed();
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}
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return totalSpeed / vehicles.size();
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}
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/**
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* Test.
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*/
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public static void testManyVehicles() {
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try {
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ManyVehicles mv = new ManyVehicles();
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mv.addVehicle(new Car(100, 100));
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mv.addVehicle(new Car(90));
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mv.addVehicle(new Aircraft(100, 70, 3900));
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mv.addVehicle(new Train(100, 60));
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System.out.println(mv.averageSpeed() == 80.0);
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} catch (Exception e) {
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System.out.println("Error uncaught exception: " + e.getClass().getName() + e.getMessage());
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}
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}
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}
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