A4 Work

A4.java

package ce1002.a4.s101201046;

import java.util.Scanner;

public class A4 {

	public static void main(String[] args) {
		Car[] cars;
		int i;
		int num;
		Scanner scan = new Scanner(System.in);
		
		do {
			System.out.println("Please input the number of cars: ");
			num = scan.nextInt();
			if (num <= 0)
				System.out.println("Out of range!");
		} while(num <= 0);
		
		cars = new Car[num];
		
		for (i = 0; i < num; i++) {
			cars[i] = new Car();
			System.out.println("Input car's");
			
			System.out.print("Brand: ");
			cars[i].set_brand(scan.next());
			
			System.out.print("Name: ");
			cars[i].set_name(scan.next());
			
			System.out.print("Max Speed: ");
			cars[i].set_max_speed(scan.nextFloat());
			System.out.print("Fuel consumption: ");
			
			cars[i].set_fuel_consumption(scan.nextFloat());
			System.out.print("Price: ");
			
			cars[i].set_price(scan.nextFloat());
			System.out.print("\n");
		}
		
		System.out.print("Output car status\n");
		
		for (i = 0; i < num; i++) {
			System.out.print("Car brand is " + cars[i].get_brand() + ".\n" +
							 "Car name is " + cars[i].get_name() + ".\n" +
							 "Car max speed is " + cars[i].get_max_speed() + ".\n" +
							 "Car fuel consumption is " + cars[i].get_fuel_consumption() + ".\n" +
							 "Car price is " + cars[i].get_price() + ".\n");
			
			System.out.print("StartTurbo!\n");
			cars[i].start_turbo();
			
			System.out.print("Turbo status is " + cars[i].isTurbo() + "\n" +
							 "Current speed is " + cars[i].CurrentSpeed(cars[i].isTurbo()) + "\n" + ((i == num-1) ? "": "\n"));
		}
		
		scan.close();
	}

}

Car.java

package ce1002.a4.s101201046;

public class Car extends Vehicle {
	private boolean isTurbo;
	
	public void start_turbo() {
		isTurbo = (java.lang.Math.random() > 0.5);
	}
	
	public boolean isTurbo() {
		return isTurbo;
	}
}

Vehicle.java

package ce1002.a4.s101201046;

public class Vehicle {
	private String brand;	
	private String name;	
	private float maxSpeed;	
	private float fuelConsumption;
	private float price;
	
	public void set_brand(String _brand) {
		brand = _brand;
	}
	
	public void set_name(String _name) {
		name = _name;
	}
	
	public void set_max_speed(float _maxSpeed) {
		maxSpeed = _maxSpeed;
	}
	
	public void set_fuel_consumption(float _fuelConsumption) {
		fuelConsumption = _fuelConsumption;
	}
	
	public void set_price(float _price) {
		price = _price;
	}
	
	public String get_brand() {
		return brand;
	}
	
	public String get_name() {
		return name;
	}
	
	public float get_max_speed() {
		return maxSpeed;
	}
	
	public float get_fuel_consumption() {
		return fuelConsumption;
	}
	
	public float get_price() {
		return price;
	}
	
	public float CurrentSpeed() {
		return maxSpeed * (float)java.lang.Math.random();
	}
	
	public float CurrentSpeed(boolean isTurbo) {
		return (isTurbo) ? (maxSpeed) : (maxSpeed * (float)java.lang.Math.random());
	}
	
}

return (isTurbo) ? (maxSpeed) : (maxSpeed * (float)java.lang.Math.random());
return (isTurbo) ? (maxSpeed) : CurrentSpeed();