Question

As an academic student, your number one tool to help you achieve your degree is your computer. Using object-oriented analysis, what class and what two subclasses could you think of for your computer? Also, think of one attribute for each of the subclasses. Explain why you selected the two subclasses and the attributes.

Answer 1

Note : Could you please check the output .If you required any changes Just intimate.I will modify it.Thank You.

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I choosed two Sub classes named Circle, Square class which will calculate the area of that Shape

Based on the shape tyep I choosed radius for Circle and Side for Square.

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Shape.java

public abstract class Shape {

//Declaring instance variables

private String type;

//Parameterized constructor

public Shape(String type) {

super();

this.type = type;

}

//Abstract method

public abstract double getArea();

  

//toString method is used to display the contents of an object inside it

@Override

public String toString() {

return "Shape : type =" + type ;

}

  

}

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Circle.java

public class Circle extends Shape {

//Declaring instance variables

private double radius;

  

//Parameterized constructor

public Circle(double radius) {

super("Circle");

this.radius = radius;

}

//getters and setters

public double getRadius() {

return radius;

}

public void setRadius(double radius) {

this.radius = radius;

}

//This method will calculate the area of the Circle

@Override

public double getArea() {

return Math.PI*radius*radius;

}

//toString method is used to display the contents of an object inside it

@Override

public String toString() {

return super.toString()+" Radius=" + radius +" Area = "+getArea();

}

}

____________________

Square.java

public class Square extends Shape {

//Declaring instance variables

private double side;

//Parameterized constructor

public Square(double side) {

super("Square");

this.side = side;

}

// getters and setters

public double getSide() {

return side;

}

public void setSide(double side) {

this.side = side;

}

//This method will calculate the area of the Square

@Override

public double getArea() {

return side * side;

}

//toString method is used to display the contents of an object inside it

@Override

public String toString() {

return super.toString() +" Side="+side+ ", Area = " + getArea();

}

}

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ShapeMain.java

public class ShapeMain {

public static void main(String[] args) {

//Creating an Shape class Array

Shape shapes[]={new Circle(5),new Square(5)};

//Displaying the info of each Shape object

for(int i=0;i<shapes.length;i++)

{

System.out.println(shapes[i]);

}

}

}

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Output:

Shape : type =Circle Radius=5.0 Area = 78.53981633974483
Shape : type =Square Side=5.0, Area = 25.0

________________Thank YOu