Question

Attached is the file GeometricObject.java. Include this in your project, but do not change.

Create a class named Triangle that extends GeometricObject. The class contains:

• Three double fields named side1, side2, and side3 with default values = 1.0. These denote the three sides of the triangle
• A no-arg constructor that creates a default triangle
• A constructor that creates a triangle with parameters specified for side1, side2, and side3.
• An accessor method for each side. (No mutator methods for the sides)
• A method named getArea() that returns the area of the triangle.
• A method named getPerimeter() that returns the circumference of the triangle
• A method named toString() that returns a string description of the triangle

Create a TriangleTester class with a main method that creates a default triangle object and prints it's description and its area and perimeter. It should also create a second triangle object with side1 = 5, side 2 = 4 and side 3 =10. Print it's description, area and perimeter.

Formula for area of a triangle requires two steps:

double s = (side1 + side2 + side3)/2;

double area = Math.sqrt(s * Math.abs(s-side1) * Math.abs(s-side2) * Math.abs(s-side3));

Perimeter is the sum of the three sides.

NEED MORE HELP CREATING THE TESER CLASS

-----------------------------

public abstract class GeometricObject {

private String color = "white";

private boolean filled;

private java.util.Date dateCreated;

/** Construct a default geometric object */

protected GeometricObject() {

dateCreated = new java.util.Date();

}

/** Construct a geometric object with color and filled value */

protected GeometricObject(String color, boolean filled) {

dateCreated = new java.util.Date();

this.color = color;

this.filled = filled;

}

/** Return color */

public String getColor() {

return color;

}

/** Set a new color */

public void setColor(String color) {

this.color = color;

}

/** Return filled. Since filled is boolean,

   * the get method is named isFilled */

public boolean isFilled() {

return filled;

}

/** Set a new filled */

public void setFilled(boolean filled) {

this.filled = filled;

}

/** Get dateCreated */

public java.util.Date getDateCreated() {

return dateCreated;

}

@Override

public String toString() {

return "created on " + dateCreated + "\ncolor: " + color +

" and filled: " + filled;

}

/** Abstract method getArea */

public abstract double getArea();

/** Abstract method getPerimeter */

public abstract double getPerimeter();

}

Answer 1

class Triangle extends GeometricObject {

    private double side1, side2, side3;

    public Triangle(double side1, double side2, double side3) {
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }

    public Triangle(double side1, double side2, double side3, String color, boolean filled) {
        super(color, filled);
        this.side1 = side1;
        this.side2 = side2;
        this.side3 = side3;
    }

    public Triangle() {
        this.side1 = 1;
        this.side2 = 1;
        this.side3 = 1;
    }

    public double getSide1() {
        return side1;
    }

    public double getSide2() {
        return side2;
    }

    public double getSide3() {
        return side3;
    }

    public double getArea() {
        double p = (side1 + side2 + side3) / 2;
        return Math.sqrt(p * (p - side1) * (p - side2) * (p - side3));
    }

    public double getPerimeter() {
        return side1 + side2 + side3;
    }

    @Override
    public String toString() {
        return "Triangle: side1 = " + side1 + " side2 = " + side2 + " side3 = " + side3 + " filled = " + filled + " color = " + color;
    }
}

class TriangleTester {

    public static void main(String[] args) {
        Triangle triangle1 = new Triangle();
        System.out.println(triangle1);
        System.out.println("Area: " + triangle1.getArea());
        System.out.println("Perimeter: " + triangle1.getPerimeter());
        System.out.println();

        Triangle triangle2 = new Triangle(5, 4, 10);
        System.out.println(triangle2);
        System.out.println("Area: " + triangle2.getArea());
        System.out.println("Perimeter: " + triangle2.getPerimeter());
        System.out.println();
    }
}