[Solved]Create Java Project Called Interfacedemo Create Following Classes Project Default Package Q37231608
Create a Java Project called InterfaceDemo
- Create the following classes in the project (under defaultpackage):
- GeometricObjects
- Circle
- Rectangle
- ShapesMain
- In addition, under the same package create a new interfacecalled Shape
- Implement the following interface and classes as per the givendirection:
- Shape : defined as: public interface Shape.The interface will contain two methods:
- public double getArea();
- public double getPerimeter();
These methods will be implemented in the Circle and Rectangleclasses.
- GeometricObjects:
Use the code given below for the GeometricObjects class:
public class GeometricObjects {
private String color;
private boolean filled;
public GeometricObjects(){
this.color = “white”;
this.filled = false;
}
/*Construct Geometric Object with specified color and filledvalue*/
public GeometricObjects(String color, booleanfilled){
this.color = color;
this.filled = filled;
}
/* Return Color*/
public String getColor(){
return color;
}
/*Return filled. since filled is boolean we name itisFilled*/
public boolean isFilled(){
return filled;
}
/*Set new color*/
public void setColor(String color) {
this.color = color;
}
/*Set new filled*/
public void setFilled(boolean filled){
this.filled = filled;
}
/* toString method that returns the stringrepresentation of object*/
public String toString(){
return “Object color is: ” + color + ” object filled is: ” +filled ;
}
}
- Circle :
The circle class will extend GeomtricObjects and implement Shapeas follows. Fill the required code for this code by following thedirections given as comments
public class Circle extends GeometricObjects implements Shape{
//3.1 Declare instance variable radius as private and typedouble.
//3.2 create a constructor that takes in radius value as anargument
//3.3 create a 3-arg constructor that takes in values forradius, color and filled. Color and filled inherited //fromGeometricObjects
//3.4 Write a getArea() method that calculates and returns thearea of the circle
//3.5 Write a getPerimeter() method that calculates and returnsthe perimeter of the circle
// 3.6 Write a toString() method that will return a return:super.toString()+ “; Circle Area is: ” + getArea() + “; Perimeteris: ” + getPerimeter() ;
}
}
- Rectangle :
This class will extend GeometricObjects and implement Shape asfollows:
public class Rectangle extends GeometricObjects implements Shape{
//4.1 Declare two instance variables width and length of typedouble and as private
//4.2 Create a 2-arg constructor that takes in values of lengthand width.
//4.3 Create a 4-arg constructor that takes invalues of width , length, color and filled. Color and filledinherited //from GeometricObjects
// 4.4 Write a getArea() method that calculates and returns thearea of the rectangle
//4.5 Write a getPerimeter() method that calculates and returnsthe perimeter of the rectangle
//4.6 Write a toString() that will return: super.toString()+ “;Rectangle Area is: ” + getArea() + “; Perimeter is: ” +getPerimeter() ;
}
}
- ShapesMain :
This will be the tester class that will use an ArrayList ofshapes, of type Shape (,the interface).
Please use the code below:
import java.util.ArrayList;
public class ShapesMain {
public static void main(String[] args){
/* 5.1 Create an array list of Shape as shown below –it can holdany Shape Circle or Rectangle since both of them implementShape.*/
ArrayList<Shape> shape = new ArrayList<Shape>();
//5.2 You can add a shape — either Rectangle of circle usingappropriate constructors as shown below
shape.add(new Rectangle(2,3));
shape.add (new Circle(5));
shape.add(new Circle(6,”blue”,true));
shape.add(new Rectangle(2,3,”red”,false));
/*5.3 Use a for loop to step through eachelement/object of the array list and print out the String returnedby the toString() method for each object. Pay attention to the useof shape.get(i) to fetch the object located in index I of theArrayList */
for(int i = 0; i<shape.size();i++){
System.out.println(“shape “+i+ ” =”+shape.get(i).toString());
}
}
}
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