Implement an abstract class Vehicle and concrete subclasses Car and Truck . A ve

Question

Implement an abstract class Vehicle and concrete subclasses Car and Truck. A vehicle has a position on the screen. Write methods draw that draw cars and trucks as follows:

Then write a method randomVehicle that randomly generates Vehicle references, with an equal probability for constructing cars and trucks, with random positions. Call it 10 times and draw all of them.

Use the following class as your main class:

You need to supply the following classes in your solution:

Use the following class in your solution:

Explanation / Answer

import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.geom.Ellipse2D; import java.awt.geom.Line2D; import java.awt.geom.Point2D; /** This class represents a car. */ public class Car extends Vehicle { /** Draw the car. @param g2 the graphics context */ public void draw(Graphics2D g2) { Rectangle body = new Rectangle(getX(), getY() + CAR_HEIGHT / 3, CAR_WIDTH, CAR_HEIGHT / 3); Ellipse2D.Double frontTire = new Ellipse2D.Double(getX() + CAR_WIDTH / 6, getY() + CAR_HEIGHT * 2 / 3, CAR_WIDTH / 6, CAR_WIDTH / 6); Ellipse2D.Double rearTire = new Ellipse2D.Double(getX() + CAR_WIDTH * 4 / 6, getY() + CAR_HEIGHT * 2 / 3, CAR_WIDTH / 6, CAR_WIDTH / 6); Point2D.Double r1 = new Point2D.Double(getX() + CAR_WIDTH / 6, getY() + CAR_HEIGHT / 3); // the bottom of the front windshield Point2D.Double r2 = new Point2D.Double(getX() + CAR_WIDTH * 2 / 6, getY()); // the front of the roof Point2D.Double r3 = new Point2D.Double(getX() + CAR_WIDTH * 4 / 6, getY()); // the rear of the roof Point2D.Double r4 = new Point2D.Double(getX() + CAR_WIDTH * 5 / 6, getY() + CAR_HEIGHT / 3); // the bottom of the rear windshield Line2D.Double frontWindshield = new Line2D.Double(r1, r2); Line2D.Double roofTop = new Line2D.Double(r2, r3); Line2D.Double rearWindshield = new Line2D.Double(r3, r4); g2.draw(body); g2.draw(frontTire); g2.draw(rearTire); g2.draw(frontWindshield); g2.draw(roofTop); g2.draw(rearWindshield); } public int getHeight() { return CAR_HEIGHT; } public int getWidth() { return CAR_WIDTH; } private final int CAR_WIDTH = 60; private final int CAR_HEIGHT = CAR_WIDTH / 2 ; } import java.awt.Graphics2D; import java.awt.Rectangle; import java.awt.geom.Ellipse2D; public class Truck extends Vehicle { public void draw(Graphics2D g2) { Rectangle body = new Rectangle(getX(), getY() + TRUCK_HEIGHT / 5, TRUCK_WIDTH / 5, TRUCK_HEIGHT * 3 / 5); Rectangle cargo = new Rectangle(getX() + TRUCK_WIDTH / 5, getY(), TRUCK_WIDTH * 4 / 5, TRUCK_HEIGHT * 4 / 5); int ybottom = getY() + TRUCK_HEIGHT * 4 / 5; int tireDiameter = TRUCK_WIDTH / 10; Ellipse2D.Double frontTire = new Ellipse2D.Double(getX(), ybottom, tireDiameter, tireDiameter); Ellipse2D.Double midTire1 = new Ellipse2D.Double(getX() + TRUCK_WIDTH * 1 / 5, ybottom, tireDiameter, tireDiameter); Ellipse2D.Double midTire2 = new Ellipse2D.Double(getX() + TRUCK_WIDTH * 3 / 10, ybottom, tireDiameter, tireDiameter); Ellipse2D.Double rearTire1 = new Ellipse2D.Double(getX() + TRUCK_WIDTH * 4 / 5, ybottom, tireDiameter, tireDiameter); Ellipse2D.Double rearTire2 = new Ellipse2D.Double(getX() + TRUCK_WIDTH * 9 / 10, ybottom, tireDiameter, tireDiameter); g2.draw(body); g2.draw(cargo); g2.draw(frontTire); g2.draw(midTire1); g2.draw(midTire2); g2.draw(rearTire1); g2.draw(rearTire2); } public int getHeight(){ return TRUCK_HEIGHT; } public int getWidth(){ return TRUCK_WIDTH; } private final int TRUCK_WIDTH = 100; private final int TRUCK_HEIGHT = TRUCK_WIDTH / 2; } import java.awt.Graphics2D; public abstract class Vehicle { public Vehicle() { xleft = 0; ytop = 0; } public abstract void draw(Graphics2D g2); public void setLocation(int x, int y) { xleft = x; ytop = y; } public int getX() { return xleft; } public int getY() { return ytop; } public abstract int getHeight(); public abstract int getWidth(); private int xleft; private int ytop; } import javax.swing.JComponent; import java.awt.Graphics; import java.awt.Graphics2D; import java.util.ArrayList; /** This component draws a collection of vehicles. */ public class VehicleComponent extends JComponent{ public VehicleComponent() { vehicles = new ArrayList(); } public void paintComponent(Graphics g) { Graphics2D g2 = (Graphics2D) g; for (Vehicle v : vehicles) v.draw(g2); } public void add(Vehicle v) { vehicles.add(v); repaint(); } private ArrayList vehicles; } import javax.swing.JComponent; import javax.swing.JFrame; public class RandomVehicleViewer extends JComponent { public static void main(String[] args) { JFrame frame = new JFrame(); final int FRAME_WIDTH = 600; final int FRAME_HEIGHT = 600; frame.setSize(FRAME_WIDTH, FRAME_HEIGHT); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JComponent component = new VehicleComponent(); frame.add(component); frame.setVisible(true); } }

Related Questions

Navigate

• Browse (All)
• Browse I
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.