import static java.lang.System.
*
; public class OddOrEven
{
private int number; public OddOrEven
(
)

{
}
public OddOrEven
(
int num
)

(
number
=
num;
}
public void setNum
(
int num
)

(
number
=
num;
}
public boolean isOdd
(
)

{
return number
%
2
!
=

0
;
}
public String toString
(
)

{
if
(
isOdd
(
)
)

{
return number
+
"
is odd.
"
;
}
else
{
return number
+
"
is even.";
}
}
}

Question

import static java.lang.System.
*
; public class OddOrEven 
{
 ﻿private int number; public OddOrEven
(
)
 
{
}
 ﻿public OddOrEven 
(
int num
)
 
(
number 
=
 ﻿num; 
}
 ﻿public void setNum
(
int num
)
 
(
number 
=
 ﻿num; 
}
 ﻿public boolean isOdd
(
)
 
{
 ﻿return number 
%
2
!
=
 
0
; 
}
 ﻿public String toString
(
)
 
{
 ﻿if
(
isOdd
(
)
)
 
{
 ﻿return number
+
"
 ﻿is odd. 
"
; 
}
 ﻿else 
{
 ﻿return number
+
"
 ﻿is even.";
}
}
}

Accepted Answer

```java import static java.lang.System.*; // Define the OddOrEven class public class OddOrEven { // Declare a private integer variable 'number' private int number; // Default constructor public OddOrEven() { // Not implemented, but could initialize 'number' here if needed } // Constructor that takes an integer 'num' and sets 'number' to it public OddOrEven(int num) { number = num; // Set the 'number' to the value of 'num' } // Method to set the value of 'number' public void setNum(int num) { number = num; // Set the 'number' to the value of 'num' } // Method to check if 'number' is odd public boolean isOdd() { return number % 2 != 0; // Return true if 'number' is odd, false otherwise } // Method to return a string indicating if 'number' is odd or even public String toString() { if (isOdd()) { // Check if 'number' is odd return number + " is odd."; // Return string indicating 'number' is odd } else { return number + " is even."; // Return string indicating 'number' is even } } } ``` ```java // Main class to test the OddOrEven class public class Main { public static void main(String[] args) { // Create an instance of OddOrEven with an even number OddOrEven evenTest = new OddOrEven(2); // Assert that the toString method returns the correct string for an even number assert evenTest.toString().equals("2 is even."); // Create an instance of OddOrEven with an odd number OddOrEven oddTest = new OddOrEven(3); // Assert that the toString method returns the correct string for an odd number assert oddTest.toString().equals("3 is odd."); } } ``` ∻Explanation∻ ⚹The provided Java code defines a class `OddOrEven` that can be used to determine if a number is odd or even. It includes a default constructor, a parameterized constructor, a method to set the number, a method to check if the number is odd, and a `toString` method to return a string indicating if the number is odd or even. The `isOdd` method uses the modulo operator `%` to determine the oddness of the number.⚹ ∻Step-by-step Instruction∻ ‖ ▪ ⋮ Define the `OddOrEven` class with a private integer member `number`. ‖ ‖ ▪ ⋮ Implement a default constructor if initialization of `number` is needed. ‖ ‖ ▪ ⋮ Implement a parameterized constructor to set `number` to the given value. ‖ ‖ ▪ ⋮ Implement the `setNum` method to allow updating the value of `number`. ‖ ‖ ▪ ⋮ Implement the `isOdd` method using the modulo operator to check if `number` is odd. ‖ ‖ ▪ ⋮ Implement the `toString` method to return a string indicating the oddness or evenness of `number`. ‖ ‖ ▪ ⋮ Define the `Main` class with a `main` method to test the `OddOrEven` class. ‖ ‖ ▪ ⋮ Create instances of `OddOrEven` with even and odd numbers and assert the correctness of the `toString` method. ‖ ∻Time Complexity∻ ⚹The time complexity for the `isOdd` method is O(1) because it performs a constant-time operation (modulo). The `toString` method also has a time complexity of O(1) as it only involves a single if-else condition and string concatenation.⚹ ∻Space Complexity∻ ⚹The space complexity for the `OddOrEven` class is O(1) because it only stores a single integer regardless of the input size.⚹

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