Assignment: Arrays in Java

Objective:

The objective of this assignment is to thoroughly test your understanding of arrays in Java, including single-dimensional arrays, multidimensional arrays, jagged arrays, and anonymous arrays. You will be required to write code snippets and solve problems using these array structures.

Part 1: Single-Dimensional Arrays

Question 1: Array Initialization and Access

Write a Java program that creates an array of 10 integers, initializes it with values from 1 to 10, and prints all the elements.

Example Output:

Array elements: 1 2 3 4 5 6 7 8 9 10

Question 2: Sum and Average of Array Elements

Write a Java program that calculates the sum and average of all elements in a single-dimensional array of 5 integers entered by the user.

Example Output:

Enter 5 numbers: 10 20 30 40 50
Sum: 150
Average: 30.0

Question 3: Find Maximum and Minimum Values in an Array

Write a Java program that finds and prints the maximum and minimum values in an array of integers.

Example Output:

Array elements: 10 20 30 40 50
Maximum value: 50
Minimum value: 10

Question 4: Reverse an Array

Write a Java program that reverses the elements of a given array and prints the reversed array.

Example Output:

Original array: 1 2 3 4 5
Reversed array: 5 4 3 2 1

Question 5: Array Element Frequency

Write a Java program that counts the frequency of each element in an array of integers and prints the result.

Example Output:

Array elements: 1 2 2 3 3 3
Frequency:
1 occurs 1 time(s)
2 occurs 2 time(s)
3 occurs 3 time(s)

Question 6: Find Second Largest Element in an Array

Write a Java program that finds the second largest element in a single-dimensional array.

Example Output:

Array elements: 10 20 30 40 50
Second largest element: 40

Question 7: Remove Duplicates from Array

Write a Java program that removes duplicate elements from an array and prints the unique elements.

Example Output:

Original array: 1 2 2 3 4 4 5
Array without duplicates: 1 2 3 4 5

Question 8: Find Common Elements Between Two Arrays

Write a Java program that finds and prints the common elements between two arrays.

Example Output:

Array 1: 1 2 3 4 5
Array 2: 4 5 6 7 8
Common elements: 4 5

Question 9: Rotate an Array

Write a Java program that rotates an array by a given number of positions to the right.

Example Output:

Original array: 1 2 3 4 5
Rotate by 2 positions
Rotated array: 4 5 1 2 3

Question 10: Find Missing Number in an Array

Write a Java program that finds the missing number in an array containing numbers from 1 to n with one missing number.

Example Output:

Array elements: 1 2 4 5
Missing number: 3

Part 2: Multidimensional Arrays

Question 11: Matrix Addition

Write a Java program that adds two 2x2 matrices and prints the resulting matrix.

Example Output:

Matrix 1:
1 2
3 4

Matrix 2:
5 6
7 8

Sum of matrices:
6 8
10 12

Question 12: Matrix Multiplication

Write a Java program that multiplies two 2x2 matrices and prints the resulting matrix.

Example Output:

Matrix 1:
1 2
3 4

Matrix 2:
2 0
1 2

Product of matrices:
4 4
10 8

Question 13: Transpose of a Matrix

Write a Java program that computes the transpose of a 3x3 matrix and prints the transposed matrix.

Example Output:

Original matrix:
1 2 3
4 5 6
7 8 9

Transposed matrix:
1 4 7
2 5 8
3 6 9

Question 14: Sum of Diagonals in a Matrix

Write a Java program that calculates and prints the sum of the primary and secondary diagonals of a 3x3 matrix.

Example Output:

Matrix:
1 2 3
4 5 6
7 8 9

Sum of primary diagonal: 15
Sum of secondary diagonal: 15

Question 15: Matrix Subtraction

Write a Java program that subtracts one 3x3 matrix from another and prints the resulting matrix.

Example Output:

Matrix 1:
9 8 7
6 5 4
3 2 1

Matrix 2:
1 2 3
4 5 6
7 8 9

Difference of matrices:
8 6 4
2 0 -2
-4 -6 -8

Question 16: Check if a Matrix is Symmetric

Write a Java program that checks if a given matrix is symmetric (i.e., equal to its transpose).

Example Output:

Matrix:
1 2 3
2 4 5
3 5 6

The matrix is symmetric.

Question 17: Spiral Traversal of a Matrix

Write a Java program that prints the elements of a 3x3 matrix in spiral order.

Example Output:

Matrix:
1 2 3
4 5 6
7 8 9

Spiral order:
1 2 3 6 9 8 7 4 5

Question 18: Find Maximum Element in Each Row of a Matrix

Write a Java program that finds and prints the maximum element in each row of a 3x3 matrix.

Example Output:

Matrix:
1 2 3
4 5 6
7 8 9

Maximum in row 1: 3
Maximum in row 2: 6
Maximum in row 3: 9

Question 19: Sum of Each Row and Column in a Matrix

Write a Java program that calculates and prints the sum of each row and each column in a 3x3 matrix.

Example Output:

Matrix:
1 2 3
4 5 6
7 8 9

Sum of row 1: 6
Sum of row 2: 15
Sum of row 3: 24

Sum of column 1: 12
Sum of column 2: 15
Sum of column 3: 18

Question 20: Identity Matrix Check

Write a Java program that checks if a given 3x3 matrix is an identity matrix (i.e., 1s on the diagonal and 0s elsewhere).

Example Output:

Matrix:
1 0 0
0 1 0
0 0 1

The matrix is an identity matrix.

Part 3: Jagged Arrays

Question 21: Jagged Array Creation and Access

Write a Java program that creates a jagged array with 3 rows, where the first row has 2 columns, the second row has 3 columns, and the third row has 4 columns. Initialize the array with values and print the elements.

Example Output:

Jagged array:
Row 1: 1 2
Row 2: 3 4 5
Row 3: 6 7 8 9

Question 22: Triangle Matrix using Jagged Array

Write a Java program that uses a jagged array to represent a triangular matrix and fills it with values. Print the triangular matrix.

Example Output:

Triangular matrix:
1 
2 3 
4 5 6 
7 8 9 10

Question 23: Jagged Array for Student Marks

Write a Java program that stores the marks of students in different subjects using a jagged array and prints them.

Example Output:

Student 1 marks: 85 90
Student 2 marks: 78 88 92
Student 3 marks: 80 75 85 90

Question 24: Jagged Array for Employee Salaries

Write a Java program that stores the salaries of employees in different departments using a jagged array and prints them.

Example Output:

Department 1 salaries: 50000 60000
Department 2 salaries: 45000 55000 65000
Department 3 salaries: 70000 80000

Question 25: Jagged Array with User Input

Write a Java program that allows the user to input values for a jagged array with 3 rows, where the first row has 2 columns, the second row has 3 columns, and the

third row has 4 columns. Print the array after input.

Example Output:

Enter values for row 1 (2 columns): 1 2
Enter values for row 2 (3 columns): 3 4 5
Enter values for row 3 (4 columns): 6 7 8 9

Jagged array:
Row 1: 1 2
Row 2: 3 4 5
Row 3: 6 7 8 9

Part 4: Anonymous Arrays

Question 26: Sum Using Anonymous Array

Write a Java program that calculates the sum of an anonymous array passed to a method.

Example Output:

Sum of array elements: 100

Question 27: Average Using Anonymous Array

Write a Java program that calculates the average of an anonymous array of double values passed to a method.

Example Output:

Average of array elements: 86.8

Question 28: Maximum Element Using Anonymous Array

Write a Java program that finds the maximum element in an anonymous array passed to a method.

Example Output:

Maximum element: 50

Question 29: Minimum Element Using Anonymous Array

Write a Java program that finds the minimum element in an anonymous array passed to a method.

Example Output:

Minimum element: 10

Question 30: Sort Using Anonymous Array

Write a Java program that sorts an anonymous array passed to a method using bubble sort and prints the sorted array.

Example Output:

Original array: 5 3 8 1 2
Sorted array: 1 2 3 5 8

Part 5: Array Manipulation

Question 31: Insert Element in Array

Write a Java program that inserts an element at a specific position in an array and shifts the other elements to the right.

Example Output:

Original array: 1 2 3 4 5
Insert 10 at position 3
Updated array: 1 2 10 3 4 5

Question 32: Remove Element from Array

Write a Java program that removes an element from a specific position in an array and shifts the remaining elements to the left.

Example Output:

Original array: 1 2 3 4 5
Remove element at position 2
Updated array: 1 2 4 5

Question 33: Split an Array

Write a Java program that splits an array into two halves and prints both halves.

Example Output:

Original array: 1 2 3 4 5 6
First half: 1 2 3
Second half: 4 5 6

Question 34: Merge Two Arrays

Write a Java program that merges two arrays into a single array and prints the merged array.

Example Output:

Array 1: 1 2 3
Array 2: 4 5 6
Merged array: 1 2 3 4 5 6

Question 35: Array Rotation by k Positions

Write a Java program that rotates an array by k positions to the right and prints the rotated array.

Example Output:

Original array: 1 2 3 4 5
Rotate by 3 positions
Rotated array: 3 4 5 1 2

Question 36: Replace All Negative Numbers in Array

Write a Java program that replaces all negative numbers in an array with 0 and prints the updated array.

Example Output:

Original array: 1 -2 3 -4 5
Updated array: 1 0 3 0 5

Question 37: Find All Prime Numbers in an Array

Write a Java program that finds and prints all the prime numbers in an array.

Example Output:

Array elements: 1 2 3 4 5 6 7 8 9 10
Prime numbers: 2 3 5 7

Question 38: Count Even and Odd Numbers in an Array

Write a Java program that counts the number of even and odd numbers in an array and prints the result.

Example Output:

Array elements: 1 2 3 4 5 6 7 8 9 10
Even numbers: 5
Odd numbers: 5

Question 39: Find the Longest Increasing Subsequence in an Array

Write a Java program that finds and prints the longest increasing subsequence in an array.

Example Output:

Array elements: 1 2 3 1 2 3 4 5
Longest increasing subsequence: 1 2 3 4 5

Question 40: Move All Zeros to End of Array

Write a Java program that moves all zeros in an array to the end while maintaining the order of other elements.

Example Output:

Original array: 1 0 2 0 3 0 4 5
Updated array: 1 2 3 4 5 0 0 0

Part 6: Array Sorting and Searching

Question 41: Bubble Sort

Write a Java program that sorts an array of integers using the bubble sort algorithm.

Example Output:

Original array: 5 1 4 2 8
Sorted array: 1 2 4 5 8

Question 42: Selection Sort

Write a Java program that sorts an array of integers using the selection sort algorithm.

Example Output:

Original array: 29 10 14 37 13
Sorted array: 10 13 14 29 37

Question 43: Insertion Sort

Write a Java program that sorts an array of integers using the insertion sort algorithm.

Example Output:

Original array: 12 11 13 5 6
Sorted array: 5 6 11 12 13

Question 44: Merge Sort

Write a Java program that sorts an array of integers using the merge sort algorithm.

Example Output:

Original array: 12 11 13 5 6 7
Sorted array: 5 6 7 11 12 13

Question 45: Quick Sort

Write a Java program that sorts an array of integers using the quick sort algorithm.

Example Output:

Original array: 10 7 8 9 1 5
Sorted array: 1 5 7 8 9 10

Question 46: Linear Search

Write a Java program that searches for an element in an array using linear search and returns its index.

Example Output:

Array: 10 20 30 40 50
Search for: 30
Element found at index: 2

Question 47: Binary Search

Write a Java program that searches for an element in a sorted array using binary search and returns its index.

Example Output:

Sorted array: 10 20 30 40 50
Search for: 40
Element found at index: 3

Question 48: Find the kth Smallest Element in an Array

Write a Java program that finds the kth smallest element in an array.

Example Output:

Array: 7 10 4 3 20 15
k = 3
kth smallest element: 7

Question 49: Find the kth Largest Element in an Array

Write a Java program that finds the kth largest element in an array.

Example Output:

Array: 7 10 4 3 20 15
k = 3
kth largest element: 10

Question 50: Find the Majority Element in an Array

Write a Java program that finds the majority element in an array (an element that appears more than n/2 times).

Example Output:

Array: 3 3 4 2 4 4 2 4 4
Majority element: 4

Submission Guidelines:

Submit your answers in a well-documented Java code file.
Provide comments in your code explaining the logic you used.
Ensure your code is clean, properly formatted, and includes error handling where necessary.

Evaluation Criteria:

Correctness of logic and implementation.
Efficient use of array structures.
Code readability and documentation.
Handling of edge cases and errors.
Efficiency of the solution.

Good luck!

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