Really struggling with this program, looking for help it. It needs to be done in

Question

Really struggling with this program, looking for help it. It needs to be done in Java

Thanks

Inheritance:

Problem: Develop the ‘Shape’ application such that:
• ‘Rectangle’, ‘Ellipse’, and ‘Triangle’ classes inherit from the ‘Shape’ class.
• Develop the ‘Square’ and ‘Circle’ class where ‘Square’ inherits from ‘Rectangle’ and ‘Circle’ inherits
from ‘Ellipse’. ‘Triangle’ has no derived class.
• For each class, implement the overridden methods ‘draw’, ‘move’, and ‘erase’. Each method should only
have an output statement such as “Rectangle – draw method” that will be displayed when the method is
invoked.
• Implement the default constructors for each class with a corresponding message to be displayed when
invoked. No initializations are required; that is, the output message will be the only executable statement in
the constructors.
• Do not implement any other methods for these classes ( i.e., ‘toString’, ‘equals’, getters and setters ).
• Implement a ‘ShapeTest’ class which will instantiate an object of each class.
• Exercise each of the ‘draw’, ‘move’, and ‘erase’ methods of each class

Explanation / Answer

abstract class Shape { Shape(){ System.out.println("Initialize generic shape parameters"); } public abstract void draw(); public abstract void move(); public abstract void erase(); } class Rectangle extends Shape { Rectangle(){ super(); System.out.println("Rect-constructor"); } public void draw(){ System.out.println("draw rect");} public void erase(){ System.out.println("erase rect");} public void move(){ System.out.println("move rect");} } class Triangle extends Shape { Triangle(){ super(); System.out.println("Tri-constructor"); } public void draw(){ System.out.println("draw tri");} public void erase(){ System.out.println("erase tri");} public void move(){ System.out.println("move tri");} } class Ellipse extends Shape { Ellipse(){ super(); System.out.println("Ellipse-constructor"); } public void draw(){ System.out.println("draw el");} public void erase(){ System.out.println("erase el");} public void move(){ System.out.println("move el");} } class Square extends Rectangle { Square(){ super(); //square parameters of course System.out.println("square constructor"); } //whatever extra methods } class Circle extends Ellipse { Circle(){ super(); //circ parameters of course System.out.println("circ constructor"); } //whatever extra methods } class ShapeTest { void main() { Shape s; s=new Rectangle();test(s); s=new Square(); test(s); s=new Ellipse(); test(s); s=new Circle(); test(s); s=new Triangle(); test(s); } void test(Shape s) { s.draw(); s.move(); s.erase(); } }

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