Shape

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Motivation

Experience implementing interfaces.

Mistakes To Avoid

Attention niels epting.svg Warning: Do NOT Parallelize

Code to Investigate

Shape

package shape.core;

public interface Shape {
	double area();
}


Code to Implement

We will build 2 classes: Rectangle and Circle which implement the interface Shape which forces the implementation of the area() method.

You will need to declare multiple fields to track the internal state of each instance. The fields you declare should be private to encapsulate the state and final for immutability.

member variables

Rectangle

public class Rectangle implements Shape
class: Rectangle.java Java.png
methods: constructor
area()
getX()
getY()
getWidth()
getHeight()
area()
package: shape.warmup
source folder: src/main/java

constructor

method: public Rectangle(double x, double y, double width, double height) Sequential.svg (sequential implementation only)

getX()

method: public double getX() Sequential.svg (sequential implementation only)

getY()

method: public double getY() Sequential.svg (sequential implementation only)

getWidth()

method: public double getWidth() Sequential.svg (sequential implementation only)

getHeight()

method: public double getHeight() Sequential.svg (sequential implementation only)

area()

method: public double area() Sequential.svg (sequential implementation only)

Circle

public class Circle implements Shape
class: Circle.java Java.png
methods: constructor
area()
getX()
getY()
getRadius()
area()
package: shape.warmup
source folder: src/main/java

constructor

method: public Circle(double x, double y, double radius) Sequential.svg (sequential implementation only)

getX()

method: public double getX() Sequential.svg (sequential implementation only)

getY()

method: public double getY() Sequential.svg (sequential implementation only)

getRadius()

method: public double getRadius() Sequential.svg (sequential implementation only)

area()

method: public double area() Sequential.svg (sequential implementation only)

\pi * r ^ 2

Testing Your Solution

Correctness

class: ShapeTestSuite.java Junit.png
package: shape.warmup
source folder: src/test/java