Hello, I need to correct this code with this feedback and add The inheritance semantics is incorrect because Triangle IS-NOT AreaCalculation but a Shape.
Likewise, Square IS-NOR AreaCalculation but a Shape.

So, may be a better hierarchy of classes would be Shape as superclass and Triangle and Square as its subclasses

 

Please add a different Exception to the program: Also please break down each class separate for better understanding with explanation as to what was done. Thank you

 

IllegalShapeDimensionArgumentException

 

public class IllegalShapeDimensionArgumentException extends IllegalArgumentException {

private String output;

public IllegalShapeDimensionArgumentException(double width, double height) {
 if (width == 0 || height == 0)
  output = "Value must be a non-zero.";
}

public String toString() {
 return this.getClass().getSimpleName() + " : " + output;
}

}

 

AreaCalc
 

public class AreaCalc {

// These attributes are shared among the subclasses of this super (parent) class.
private double width, height;

// Overloading constructors based on if shape is straight-edged or curved.
public AreaCalc(double width, double height) {
 if (width <= 0 || height <= 0) { // if width or height or both is invalid, throw exception
  throw new IllegalShapeDimensionArgumentException(width, height);
 }
 
 this.width = width;
 this.height = height;
}

// get methods

public double getHeight() {
 return this.height;
}

public double getWidth() {
 return this.width;
}

// set methods

public void setHeight(double height) {
 this.height = height;
}

public void setWidht(double width) {
 this.width = width;
}

// display methods with overriding.
@Override
public String toString() {
 return "This shape has width " + this.width + " and height " + this.height + ".";
}

//This method is shared among the subclasses of this super class.
public double calcArea() {
 return this.getWidth() * this.getHeight();
}
 

}

 

AreaOfShapes

class AreaOfShapes {

public static void main(String[] args) {
 // Creating new object.
 // Testing to see if exception can be caught.
 try {
  Square mySquare = new Square(4, 3);
  // Invoking inheritance traits from super class to subclass.
  System.out.println(mySquare.toString());
 
  // Inserting white space between text.
  System.out.println();
 
  // Creating Triangle object.
  Triangle myTriangle = new Triangle(4, 0);
  // Invoking inheritance traits from super class to subclass.
  System.out.println(myTriangle.toString());
 }
 catch (IllegalShapeDimensionArgumentException o) {
  System.out.println(o.toString());
 }
 
}

}

 

Triangle

public class Triangle extends AreaCalc {

//Giving unique attribute to Triangle subclass
double totalAreaT;

// constructor
public Triangle(double height, double width) {
 super(height, width);
 this.totalAreaT = this.calcArea() / 2;
}
 
// get method
public double getTotalAreaT() {
 return this.totalAreaT;
}

// set method
public void setTotalAreaT(double totalAreaT) {
 this.totalAreaT = totalAreaT;
}
 
// Override string method from parent class.
public String toString() { // unique display method, checks whether object is square
 return "This shape has width " + this.getWidth() + " and height " + this.getHeight() + ".\nThis shape is a triangle with total area " + this.totalAreaT + ".";
}
}

 

Square

 

public class Square extends AreaCalc {

//Giving unique attribute to subclass Square.
private double totalArea; // shape's total area

// constructor
public Square(double height, double width) {
 super(height, width);
 this.totalArea = this.calcArea();
}

// get method
public double getTotalArea() {
 return this.totalArea;
}

// set method
public void setTotalArea(double totalArea) {
 this.totalArea = totalArea;
}

// Overriding string method from parent class.
public String toString() {
 
 // unique display method, checks whether object is square
 if (this.getHeight() == this.getWidth()) {
  return "This shape has width " + this.getWidth() + " and height " + this.getHeight() + ".\nThis shape is a square with total area " + this.totalArea + ".";
 }
 else {
  return "This shape has width " + this.getWidth() + " and height " + this.getHeight() + ".\nThis shape is a rectangle with total area " + this.totalArea + ".";
 }
}
}