Question

What is the code for this in Java?

Assignment Inheritance Learning Objectives Declare a subclass that derives from a superclas:s ■ Demon "Declare a variable of the superclass type and assign it an instance of the subclass type strate polymorphic behavior Access the public members of the superclass type Notice how the overridden versions of the subclass type are called Notice how the subclass specific members are inaccessible "Create an array of superclass type and use a foreach loop to iterate through it Style Comments On this and all upcoming assignments pay attention to style. Follow Java naming convention, use proper indentation group related code statements with single empty lines, use descriptive names etc. Strive to write code that is clear and easy to read Also: use doc comments on all your code Description: Write a program to demonstrate the use of inheritance and polymorphism. You will create 4 classes: Rectangle, Square, IsoscelesRightTriangle, and Circle In addition you will create a class called InheritanceApp. This class includes the main method. Here we test the four other classes and we demonstrate the polymorphic behavior Declare the classes as described below: Class Retangle: . Rectangle has 2 private final fields of type int: length and width It has (exactly) one parameterized constructor that initializes both fields It provides a getter (get accessor method) for each of the fields (no setter) It overrides the toString method so that it produces a result of the form Rectangle (lengthxwidth) e.g. Rectangle (5x4) Class Square: Square extends Rectangle No fields are declared in class Square It has a parameterized constructor with (only) one parameter The parameter is used to initialize both fields of Rectangle It has a method called getSide to expose the side-length of the square Override the toString method so that it will return a String of the following form Square (side) e.g. Square (4)

Answer 1

Program:

InheritanceApp.java

public class InheritanceApp {

public static void main(String[] args) {

Rectangle myRectangle=new Rectangle(5,4);//rectangle object

Square mySquare=new Square(4);//square object

IsoscelesRightTriangle myIsoscelesRightTriangle=new IsoscelesRightTriangle(5);//isoscees right angle object

Circle myCircle=new Circle(4);//circle object

//printing the objects details that we have created earlier

System.out.println(myRectangle.toString()+"\nLength:"+myRectangle.getLength()+"\nWidth:"+myRectangle.getWidth());

System.out.println(mySquare.toString()+"\nSide:"+mySquare.getSide());

System.out.println(myIsoscelesRightTriangle.toString()+"\nLeg:"+myIsoscelesRightTriangle.getLeg()+"\nHypotenuse:"+myIsoscelesRightTriangle.hypotenuse());

System.out.println(myCircle.toString()+"\nDiameter:"+myCircle.diameter()+"\nCircumference:"+myCircle.circumference()+"\nRadius:"+myCircle.getRadius());

//creating another square object and assigning it to rectangle as it is parent class of square it can hold square object

Rectangle rectangle2=mySquare;

//printing the details

System.out.println("recatngle2:\n.................");

System.out.println();

System.out.println(rectangle2.toString()+"\nLength:"+rectangle2.getLength()+"\nWidth:"+rectangle2.getWidth());

System.out.println("Calling get side and see what happens"+((Square) rectangle2).getSide());

System.out.println("Rectangle Array:\n.............");

//creating the array of rectangle objects and assigining previous ly created square and rectangle objects

Rectangle[] rectangles={rectangle2,mySquare,myRectangle};

//printing the objects

for(int i=0;i<3;i++)

{

System.out.println(rectangles[i].toString()+"\nLength:"+rectangles[i].getLength()+"\nWidth:"+rectangles[i].getWidth());

}

}

}

Square.java

public class Square extends Rectangle {

public Square(int length) {//parameterized constructor

super(length, length);//calling super class constructor

}

public int getSide()//getter for side

{

return this.getLength();

}

public String toString() {//to string method

return "Square (" + getSide() + ")";

}

}

IsoscelesRightAngle.java

public class IsoscelesRightTriangle {

private int leg;//to hold value of leg

public IsoscelesRightTriangle(int leg) {

super();

this.leg = leg;

}

public double hypotenuse()//returns hypotensuse

{

return Math.sqrt(leg*leg+leg*leg);

}

public int getLeg() {//returns leg value

return leg;

}

//to string method

public String toString() {

return "IsoscelesRightTriangle (" + leg + ")";

}

}

Circle.java

public class Circle {

private int radius;//to hold radius

public Circle(int radius) {//parameterized constructor

super();

this.radius = radius;

}

public int getRadius() {//to get the radius

return radius;

}

public int diameter()//returns diameter 2*r

{

return 2*radius;

}

public double circumference()//returns circumference 2*pi*r

{

return 2*3.14*radius;

}

public String toString() {//to string method

return "Circle (" + radius + ")";

}

}

Rectangle.java

public class Rectangle {

private int length;//to hold length

private int width;//to hold width

public int getLength() {//getter for length

return length;

}

public int getWidth() {//getter for width

return width;

}

public Rectangle(int length, int width) {//parameterized constructor

super();

this.length = length;

this.width = width;

}

public String toString() {//to string methos

return "Rectangle (" + length + "X"+ width + ")";

}

}

Output:

<terminated > Inheritance Rectangle (5X4) Length:5 Width:4 Square (4) Side:4 Java Application CProgra IsoscelesRightTriangle (5) Leg:5 Hypotenuse:7.0719678118654755 Circle (4) Diameter:8 Circumference:25.12 Radius:4 recatngle2: Square (4) Length:4 Width:4 Calling get side and see what happens4 Rectangle Array: Square (4) Length:4 Width:4 Square (4) Length:4 Width:4 Rectangle (5X4) Length:5 Width:4