Create a subclass with multiple constructors

Unit 9: Inheritance - Review Assignment

What is the concept of inheritance in Java and how does it facilitate code reuse?

Creating a superclass and subclass in Java

Using the super keyword in Java

What is the purpose of a constructor in a Java subclass and how does it differ from a constructor in a superclass?

Write a simple Java subclass constructor that calls the superclass constructor.

Create a subclass with a constructor

Override a superclass constructor

Create a subclass with multiple constructors

What is method overriding in Java and why is it used?

10.

How does Java determine which method to invoke at runtime when method overriding is used?

11.

Overriding the toString method in a subclass

12.

Overriding the calculateArea method in a subclass

13.

Overriding the equals method in a subclass

14.

What is the purpose of the super keyword in Java and how is it used to invoke superclass constructors?

15.

How does the super keyword in Java help in resolving method name conflicts in subclass methods?

16.

Using super to invoke superclass constructor

17.

Using super to access superclass members

18.

Using super to resolve method name conflicts in subclass methods

19.

Explain the concept of inheritance in Java and how it is used to create superclass and subclass objects.

20.

What is the purpose of the super keyword in Java and how is it used within inheritance hierarchies?

21.

Creating a superclass and subclass in Java

22.

Using superclass reference to access subclass object

23.

Using the super keyword in Java

24.

What is polymorphism in Java and how does it contribute to writing flexible and reusable code?

25.

How does method overriding enable polymorphic behavior in Java?

26.

Implementing Polymorphism in Java

27.

Explain the relationship between all Java classes and the Object class.

28.

What is the purpose of the equals() method in the Object class in Java?

29.

Implementing the toString() method in a custom class

30.

Implementing the equals() method in a custom class

31.

Implementing the hashCode() method in a custom class

Create a class named Rectangle with two instance variables length and width of type int. The Rectangle class should have a constructor that accepts two int parameters and assigns them to length and width. Then, create a subclass named Square that extends Rectangle. The Square class should have two constructors: one that accepts a single int parameter and passes it to the superclass constructor twice, and another that accepts no parameters and passes the number 1 to the superclass constructor twice.

You answeredJUST NOW

Java

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import java.io.*;
import java.util.*;
class Rectangle {
    int length;
    int width;
    Rectangle(int length, int width) {
        this.length = length;
        this.width = width;
    }
}
class Square extends Rectangle {
    // WRITE YOUR CODE HERE
}
// Testing mechanism - do not modify!
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Square square1 = new Square(in.nextInt());
        System.out.println(square1.length);
        System.out.println(square1.width);
        Square square2 = new Square();
        System.out.println(square2.length);
        System.out.println(square2.width);
    }
}
 
 
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You passed all test cases!

STDIN

Expected STDOUT

5
5
1
1

Your STDOUT

5
5
1
1

STDIN

Expected STDOUT

1
1
1
1

Your STDOUT

1
1
1
1

STDIN

Expected STDOUT

9
9
1
1

Your STDOUT

9
9
1
1

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Instructor solution

Alec KretchAPR 24, 2024, 8:16:56 AM

Java

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import java.io.*;
import java.util.*;
class Rectangle {
    int length;
    int width;
    Rectangle(int length, int width) {
        this.length = length;
        this.width = width;
    }
}
class Square extends Rectangle {
    Square(int side) {
        super(side, side);
    }
    Square() {
        super(1, 1);
    }
}
// Testing mechanism - do not modify!
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Square square1 = new Square(in.nextInt());
        System.out.println(square1.length);
        System.out.println(square1.width);
        Square square2 = new Square();
        System.out.println(square2.length);
        System.out.println(square2.width);
    }
}
 
 
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How do you create multiple constructors in a subclass in Java?

Select one of the following options:

A.
By defining a single constructor in the subclass with multiple parameters and calling super with different arguments based on conditional statements.
B.
By defining multiple constructors in the superclass and calling super with the same arguments in the subclass constructor.
C.
By defining multiple constructors in the subclass with different parameters and calling super with the appropriate arguments in each constructor.
D.
By defining a single constructor in the subclass with no parameters and calling super with different arguments based on user input.

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