9.6.7 Cars Codehs Github Updated Jun 2026

public class Truck extends Car private double towCapacity; // in tons // Constructor public Truck(String make, String model, int year, double fuelEfficiency, double towCapacity) super(make, model, year, fuelEfficiency); // call Car constructor this.towCapacity = towCapacity;

draw(ctx) ctx.fillStyle = this.color; ctx.fillRect(this.x, this.y, 50, 50);

The exercise is a classic teaching tool for inheritance and polymorphism in Java. By mastering it, you solidify concepts that appear in AP Computer Science A exams and real-world development jobs. 9.6.7 Cars Codehs Github

We’ll build four components:

: Typically includes a model and fuelLevel with a toString() that returns something like "Model car Fuel Amount: X". public class Truck extends Car private double towCapacity;

function animate() ctx.clearRect(0, 0, canvas.width, canvas.height); for (let i = 0; i < cars.length; i++) cars[i].move(); cars[i].draw(ctx);

Once the loop ends, iterate through the ArrayList using an enhanced for-loop. Even though the list is typed as Car , Java will call the specific toString() method for each object (polymorphism). for(Car car : cars) System.out.println(car); Use code with caution. Copied to clipboard function animate() ctx

// Print all vehicles System.out.println("All vehicles:"); for (Car v : vehicles) System.out.println(v);

After the loop, a for-each loop iterates through the list, calling System.out.println(car); . Because of polymorphism, the program automatically calls the correct toString() version for each object. Common Pitfalls and Troubleshooting