Question

Create a class Circle with one instance variable of type double called radius. Then define an appropriate constructor that takes an initial value for the radius, get and set methods for the radius, and methods getArea and getPerimeter.

Create a class RightTriangle with three instance variables of type double called base, height, and hypotenuse. Then define an appropriate constructor that takes initial values for the base and height and calculates the hypotenuse, a single set method which takes new values for base and height and calculates the hypotenuse, get methods for all three instance variables, and methods getArea and getPerimeter.

Then create a test application which queries the user for the needed data to create two Circle objects and two RightTriangle objects. It will then display all information about the four objects. It should then display which Circle object has the largest area and which RightTriangle object has the largest area.

Shell:

import java.util.Scanner;

// Then create a test application
public class Lab5Shell
{
   public static void main(String[] args)
   {
       Scanner input = new Scanner(System.in);

       // which queries the user for the needed data to create two Circle objects
       Circle c1, c2;

       // and two RightTriangle objects.
       RightTriangle r1, r2;

       // It will then display all information about the four objects.

       // It should then display which Circle object has the largest area

       // and which RightTriangle object has the largest area.
   }
}

//Create a class Circle
class Circle
{
   // with one instance variable of type double called radius

   // Then define an appropriate constructor that takes an initial value for the radius

   // get and set methods for the radius

   // and methods getArea and getPerimeter.
}

//Create a class RightTriangle
class RightTriangle
{
   // with three instance variables of type double called base, height, and hypotenuse.

   // Then define an appropriate constructor which takes initial values for the base and height and calculates the hypotenuse,

   // a single set method which takes new values for base and height and calculates the hypotenuse,

   // get methods for all three instance variables

   // and methods getArea and getPerimeter.
}

Answer 1

Following is the answer:

Circle.java

public class Circle {
    private double radius;
    Circle(double radius){
        this.radius = radius;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public double getArea(){
        return 3.14 * this.radius * this.radius;
    }

    public double getPerimeter(){
        return 2 * 3.14 * this.radius;
    }

    @Override
    public String toString() {
        return "Circle{" +
                "radius=" + radius +
                '}' + "Area = " + this.getArea() + " Perimeter = " + this.getPerimeter();
    }
}

RightTriangle.java

public class RightTriangle {
    private double base;
    private double height;
    private double hypotenuse;

    RightTriangle(double base, double height){
        this.base = base;
        this.height = height;
        this.hypotenuse = Math.sqrt((base * base) + (height * height));
    }

    public double getBase() {
        return base;
    }

    public double getHeight() {
        return height;
    }

    public double getHypotenuse() {
        return hypotenuse;
    }

    public void setHypotenuse(double base, double height) {
        this.hypotenuse = Math.sqrt((base * base) + (height * height));
    }

    public double getArea(){
        return (this.base * this.height)/2;
    }

    public double getPerimeter(){
        return (this.base + this.height)+Math.sqrt((base * base) + (height * height));
    }

    @Override
    public String toString() {
        return "RightTriangle{" +
                "base=" + base +
                ", height=" + height +
                ", hypotenuse=" + hypotenuse +
                '}' + "Area = " + this.getArea() + " Perimeter = " + this.getPerimeter();
    }
}

Lab5Shell.java

import java.util.Scanner;

public class Lab5Shell {
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);

        // which queries the user for the needed data to create two Circle objects
        Circle c1, c2;
        c1 = new Circle(3);
        c2 = new Circle(4);
        System.out.println(c1.toString());
        System.out.println(c2.toString());

        if(c1.getArea() > c2.getArea()){
            System.out.println("C1 has large area");
        }
        // and two RightTriangle objects.
        RightTriangle r1, r2;
        r1 = new RightTriangle(3,4);
        r2 = new RightTriangle(4,5);
        System.out.println(r1.toString());
        System.out.println(r2.toString());

        if(r1.getArea() > r2.getArea()){
            System.out.println("R1 has large area");
        }

    }
}

Output: