In this exercise, we are going to revist our Car and ElectricCar class from lesson 3. In lesson 3, you were given the Car class and needed to complete the ElectricCar class. You can use your code from that exercise to get started here. The focus of this exercise is the CarTester class. In this class, you will prompt the user for a car model and if the car is not electric, you will also prompt the user for the miles per gallon. For each car, you will add it to a single ArrayList. You will continue asking the user until they exit, then you will loop through your ArrayList and print the results. Remember, for a method call to compile, it needs to be defined in the reference type (the Car class in this exercise), but the actual method that executes will be based on the instantiated class. In this exercise, we want electric cars to run the Override methods. Sample Output Please enter a car model name(exit to quit): Tesla Is this car electric? (y or n) y Please enter a car model name(exit to quit): F-150 Is this car electric? (y or n) n How many miles per gallon: 18 Please enter a car model name(exit to quit): exit Car: Tesla MPG: Electric cars do not calculate MPG Car: F-150 MPG: 18
In this exercise, we are going to revist our Car and ElectricCar class from lesson 3. In lesson 3, you were given the Car class and needed to complete the ElectricCar class. You can use your code from that exercise to get started here.
The focus of this exercise is the CarTester class. In this class, you will prompt the user for a car model and if the car is not electric, you will also prompt the user for the miles per gallon. For each car, you will add it to a single ArrayList.
You will continue asking the user until they exit, then you will loop through your ArrayList and print the results.
Remember, for a method call to compile, it needs to be defined in the reference type (the Car class in this exercise), but the actual method that executes will be based on the instantiated class. In this exercise, we want electric cars to run the Override methods.
Sample Output
Please enter a car model name(exit to quit): Tesla Is this car electric? (y or n) y Please enter a car model name(exit to quit): F-150 Is this car electric? (y or n) n How many miles per gallon: 18 Please enter a car model name(exit to quit): exit Car: Tesla MPG: Electric cars do not calculate MPG Car: F-150 MPG: 18
and here is my code for the test class:
import java.util.*;
import java.util.Scanner;
public class CarTester
{
String s1 = input.nextLine();
String s2 = input.nextLine();
String s3 = input.nextLine();
Car c2 = new Car(s1,s3);
Car c1 = new ElectricCar(s1);
ArrayList<Car> cars = new ArrayList<Car>();
for (int i = 0;i<Integer.MAX_VALUE;i++)
{
System.out.println("Please enter a car model name(exit to quit): ");
if(s1.equals("exit")){
break;
}
else{
System.out.println("Is this car electric? (y or n) ");
if(s2.equals("n")){
System.out.println("How many miles per gallon: ");
cars.add(c2);
}
else{
cars.add(c1);
}
}
}
for (int j=0;j<cars.size();j++){
System.out.println("Car: "+cars.get(j).getModel());
System.out.println("MPG: "+cars.get(j).getMPG());
System.out.println();
}
}
there always appears some errors
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