Java Exercise: Create an object called Circle and write a test program that uses

Question

Java Exercise:

Create an object called Circle and write a test program that uses the Circle class.

Details for your Circle object:

Two private instance variables: radius (of type double) and color (of type String), with default value of 1.0 and "red", respectively.

Two overloaded constructors (one that takes in no parameters and one that accepts a double (to be assigned to the radius)

Two public methods: getRadius() and getArea().

Diagram for reference:

Details for your test program:

Declare instances of the Circle class to be able to pint out the results.

When you done, send me both files, and a screen shot of your results after running your test program.

Explanation / Answer

Code:

public class Circle{

    double radius=1;
    String color="red";
  
    public Circle(){ //default constructor
    }
    public Circle(double r){
        radius=r;
    }
    public double getRadius(){
        return radius;
    }
    public double getArea(){
        return Math.PI*radius*radius;
    }

    //Testing function
    public static void main(String []args){
        Circle c1 = new Circle(); //initilised with default constructor
        Circle c2 = new Circle(2); //initilised with constructor that takes radius as argument
        System.out.println(c1.getRadius());
        System.out.println(c2.getRadius());
        System.out.println(c1.getArea());
        System.out.println(c2.getArea());
    }
}

Output:

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