package src;

/**

* A class called circle is designed as shown in the following class diagram. It contains:

*

* 1) Two private instance variables: radius (of type double) and color (of type String),

* with default value of 1.0 and "red", respectively.

* 2) Two overloaded constructors;

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

*

* The source codes for Circle is as follows:

*/

public class Circle extends Shape {

// private instance variable, not accessible from outside this class

private double radius;

// 1st constructor, which sets both radius and color to default

public Circle() {

super();

this.radius = 1.0;

}

// 2nd constructor with given radius, but color default

public Circle(double radius) {

super();

this.radius = radius;

}

// Construtor to construct a new instance of Circle with the given radius and color

public Circle (double radius, String color) {

this(radius);

setColor(color);

}

public Circle (double radius, String color, boolean filled) {

this(radius, color);

setFilled(filled);

}

// A public method for retrieving the radius

public double getRadius() {

return radius;

}

// Setter for instance variable radius

public void setRadius(double radius) {

this.radius = radius;

}

// A public method for computing the area of circle

public double getArea() {

return radius*radius*Math.PI;

}

public double getPerimeter() {

return 2 * radius * Math.PI;

}

@Override

public String toString() {

return "A Circle with radius = "+radius

+ ", which is a subclass of "+super.toString();

}

}