A class Trans is defined to find the transpose of a square matrix. A transpose of a matrix is…

import java.util.Scanner;

class Trans
{
    static Scanner sc = new Scanner(System.in);
    int arr[][];   // the matrix
    int m;         // size of the matrix

    // parameterised constructor
    Trans(int mm)
    {
        m = mm;
        arr = new int[m][m];
    }

    // accepts the elements of the matrix
    void fillarray()
    {
        System.out.println("Enter " + (m * m) + " elements:");
        for (int i = 0; i < m; i++)
            for (int j = 0; j < m; j++)
                arr[i][j] = sc.nextInt();
    }

    // transposes the matrix in place by swapping arr[i][j] and arr[j][i]
    void transpose()
    {
        for (int i = 0; i < m; i++)
        {
            for (int j = i + 1; j < m; j++)
            {
                int t = arr[i][j];
                arr[i][j] = arr[j][i];
                arr[j][i] = t;
            }
        }
    }

    // prints the matrix row by row
    void print()
    {
        for (int i = 0; i < m; i++)
        {
            for (int j = 0; j < m; j++)
                System.out.print(arr[i][j] + "\t");
            System.out.println();
        }
    }

    // displays the original matrix, then the transposed matrix
    void display()
    {
        System.out.println("ORIGINAL MATRIX");
        print();
        transpose();
        System.out.println("TRANSPOSE");
        print();
    }

    public static void main(String args[])
    {
        System.out.print("Enter the size of the matrix: ");
        int size = sc.nextInt();
        Trans ob = new Trans(size);
        ob.fillarray();
        ob.display();
    }
}

Enter the size of the matrix: 3
Enter 9 elements:
11 5 7
8 13 9
1 6 20
ORIGINAL MATRIX
11	5	7	
8	13	9	
1	6	20	
TRANSPOSE
11	8	1	
5	13	6	
7	9	20