it 401 – 6541

College of Computing and Informatics
Assignment 2
Deadline: Day 5/5/2024 @ 23:59
[Total Mark for this Assignment is 8]
Student Details:
Name: ###
ID: ###
CRN: ###
Instructions:
• You must submit two separate copies (one Word file and one PDF file) using the Assignment Template on
Blackboard via the allocated folder. These files must not be in compressed format.
• It is your responsibility to check and make sure that you have uploaded both the correct files.
• Zero mark will be given if you try to bypass the SafeAssign (e.g. misspell words, remove spaces between
words, hide characters, use different character sets, convert text into image or languages other than English
or any kind of manipulation).
• Email submission will not be accepted.
• You are advised to make your work clear and well-presented. This includes filling your information on the cover
page.
• You must use this template, failing which will result in zero mark.
• You MUST show all your work, and text must not be converted into an image, unless specified otherwise by
the question.
• Late submission will result in ZERO mark.
• The work should be your own, copying from students or other resources will result in ZERO mark.
• Use Times New Roman font for all your answers.
Restricted – ‫مقيد‬
Question One
Pg. 01
Learning
Outcome(s):
Question One
2 Marks
Find the issues in the following Java code, then correct them.
CLO4:
Develop a
program based on
public class Rectangular
{
private int length;
private int width;
specification using
public Rectangular(int length, int width)
{
this.length = length;
this.width = width;
}
programming
language
elements including
syntax, data types,
public String area ()
{
return length * width;
}
conditional
statement, control
structures.
}
public class RectangularTest
{
public static void main (String[] args)
{
Rectangular r1 = new Rectangular(3,5);
System.out.println(area());
}
}
Issues in the Code:
1- Return Type Mismatch:
The area() method in the Rectangular class is declared to return a String but computes
an integer result (length * width). The return type should match the computed result.
2- Static Context Misuse:
In the RectangularTest class, the main method tries to call area() as if it were a static
method, which it is not. You need to call area() on an instance of the Rectangular class.
3- Method Access:
Restricted – ‫مقيد‬
Question One
Pg. 02
The System.out.println(area()); statement is incorrect because it does not specify the
object whose area method should be called.
Corrected Code:
public class Rectangular {
private int length;
private int width;
public Rectangular(int length, int width) {
this.length = length;
this.width = width;
}
// Corrected the return type to int as the area
calculation results in an integer.
public int area() {
return length * width;
}
}
public class RectangularTest {
public static void main(String[] args) {
Rectangular r1 = new Rectangular(3, 5);
// Correctly access the area() method through the
instance ‘r1’ and print the integer directly.
System.out.println(r1.area());
}
}
Restricted – ‫مقيد‬
Question Two
Pg. 03
Learning
Outcome(s):
CLO4:
Question Two
2 Marks
1- Create a Java class for Student with the following requirements:
Develop a
•
Each student has two attributes: Name and ID.
•
Create two constructors. One constructor without parameters to initialize all the
instance variables to default values, and another constructor to initialize all the
program based on
attributes to specific values.
specification
•
Add all setter and getter methods.
using
programming
2- Create a tester class with the main method with the following requirements.
language
elements
•
Create two objects from Student class. Create the first object using the default
constructor and the second object must set your name and ID.
•
Print your name and ID using getter methods.
including syntax,
data types,
Sample of the output:
conditional
statement, control
structures.
1- Step 1: Create the Student Class
public class Student {
private String name;
private String id;
// Constructor with no parameters (sets default values)
public Student() {
this.name = “Default Name”;
this.id = “0000000000”;
}
// Constructor with parameters to set name and ID
Restricted – ‫مقيد‬
Question Two
Pg. 04
public Student(String name, String id) {
this.name = name;
this.id = id;
}
// Getter for name
public String getName() {
return name;
}
// Setter for name
public void setName(String name) {
this.name = name;
}
// Getter for ID
public String getId() {
return id;
}
// Setter for ID
public void setId(String id) {
this.id = id;
}
}
2- Step 2: Create the Tester Class
public class Tester {
public static void main(String[] args) {
// Create the first Student object using the default constructor
Student student1 = new Student();
// Create the second Student object using the parameterized constructor
Student student2 = new Student(“Ama1 Ahmad”, “122334455”);
Restricted – ‫مقيد‬
Question Two
Pg. 05
// Print name and ID using getter methods
System.out.println(“Name: ” + student2.getName());
System.out.println(“ID: ” + student2.getId());
}
}
‫فوق بالكود فيه لون احمر هنا تحط اسمك ورقمك ويطلع االوبت تصوره وتحطه بدال من الصورة هذي‬
Restricted – ‫مقيد‬
Question Three
Pg. 06
Learning
Outcome(s):
CLO4:
Question Three
2 Marks
Suppose you have the following 2 dimensions array:
int arr[][] = {
{ 10, 11, 12, 13, 14 },
{ 15, 16, 17, 18, 19 },
{ 20, 21, 22, 23, 24 },
{ 25, 26, 27, 28, 29 },
{ 30, 31, 32, 33, 34 }
Develop a
program based on
specification
};
using
programming
language
With the the following rows and columns sizes:
elements
static int rows= 5;
static int columns= 5;
including syntax,
data types,
Write a Java programs that uses takes arr[][] and reverse (mirror) all rows. For example,
conditional
the first row should be as the following after you reverse it 14 13 12 11 10. A screenshot
statement, control
of your output should also be included in your answer and should display both the original
structures.
array and the reversed array.
Sample output:
Restricted – ‫مقيد‬
Question Three
Pg. 07
: ‫الجواب‬
public class ArrayReverser {
public static void main(String[] args) {
int[][] arr = {
{10, 11, 12, 13, 14},
{15, 16, 17, 18, 19},
{20, 21, 22, 23, 24},
{25, 26, 27, 28, 29},
{30, 31, 32, 33, 34}
};
// Print the original array
System.out.println(“The original array:”);
printArray(arr);
// Reverse the rows of the array
reverseRows(arr);
System.out.println(“The reversed (mirrored) array:”);
printArray(arr);
}
public static void reverseRows(int[][] array) {
Restricted – ‫مقيد‬
Question Three
Pg. 08
for (int i = 0; i
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