This quiz uses the three classes below. Watch out for bugs! This quiz uses the t

Question

This quiz uses the three classes below. Watch out for bugs!

This quiz uses the three classes below. Watch out for bugs!

public class Trapezoid {
private double height, width, base;

public Trapezoid(double h, double w, double b) {
setHeight(h);
setWidth(w);
setBase(b);
}

public double getHeight() { return height; }
public double getWidth() { return width; }
public double getBase() { return base; }

public void setHeight(double h) { height = h; }
public void setWidth(double w) { width = w; }
public void setBase(double b) { base = b; }

public double area() {
return getHeight() * (getWidth() + getBase()) / 2;
}

public double perimeter() {
return 2 * getHeight() + getWidth() + getBase();
}
}


public class Rectangle extends Trapezoid {
public Rectangle(double h, double w) {
super(h, w, w);
}

public double area() { return getHeight() * getWidth(); }
}


public class Square extends Rectangle {
public Square(double w) {
super(w, w);
}

public double area() { return getWidth() * getWidth(); }
}

What is output by the following code?

Trapezoid t = new Trapezoid(2, 4, 6);
t.setWidth(8);
double a = t.area();
double p = t.perimeter();
System.out.print(a + " " + p)

Rectangle r = new Rectangle(4, 6);
r.setWidth(8);
double a = r.area();
double p = r.perimeter();
System.out.print(a + " " + p);

System.out.print(a1 + " " + a2 + " " + a3);

Explanation / Answer

Trapezoid.java

public class Trapezoid {
private double height, width, base;

public Trapezoid(double h, double w, double b) {
setHeight(h);
setWidth(w);
setBase(b);
}

public double getHeight() { return height; }
public double getWidth() { return width; }
public double getBase() { return base; }

public void setHeight(double h) { height = h; }
public void setWidth(double w) { width = w; }
public void setBase(double b) { base = b; }

public double area() {
return getHeight() * (getWidth() + getBase()) / 2;
}

public double perimeter() {
return 2 * getHeight() + getWidth() + getBase();
}
}

____________________

Rectangle.java

public class Rectangle extends Trapezoid {
public Rectangle(double h, double w) {
super(h, w, w);
}

public double area() { return getHeight() * getWidth(); }
}

__________________

Square.java

public class Square extends Rectangle {
public Square(double w) {
super(w, w);
}

public double area() { return getWidth() * getWidth(); }
}

_____________________

Test.java

public class Test {

   public static void main(String[] args) {
       Trapezoid t = new Trapezoid(2, 4, 6);
       t.setWidth(8);
       double a = t.area();
       double p = t.perimeter();
       System.out.println(a + " " + p);
       Rectangle r = new Rectangle(4, 6);
       r.setWidth(8);
       double rectarea = r.area();
       double rectperim = r.perimeter();
       System.out.println(rectarea + " " + rectperim);
       Trapezoid t1 = new Trapezoid(1, 1, 1);
       Rectangle r1 = new Rectangle(2, 2);
       Square s = new Square(3);
       r = s;
       double a1 = t1.area();
       double a2 = r1.area();
       double a3 = s.area();
       System.out.print(a1 + " " + a2 + " " + a3);

   }

}

_________________

Output:

14.0 18.0
32.0 22.0
1.0 4.0 9.0

_________Thank You

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

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