Java Program to Display Upper Triangular Matrix

// Java Program to print the upper triangular matrix
import java.io.*;

class GFG {
  
    // Print matrix using iterative approach
    public static void printMatrix(int[][] a)
    {
        for (int i = 0; i < a.length; i++) {
            for (int j = 0; j < a[0].length; j++)
                System.out.print(a[i][j] + " ");
            System.out.println();
        }
    }
    public static void upperTriangularMatrix(int matrix[][])
    {
        int row = matrix.length;
        int col = matrix[0].length;
      
        // if number of rows and 
        // columns are not equal,then
        // return back
        if (row != col) {
            System.out.println(
                "Matrix should be a Square Matrix");
            return;
        }
        else {
          
            // looping over the whole matrix
            for (int i = 0; i < row; i++) {
                for (int j = 0; j < col; j++) {
                  
                    // for the rows ,whose row number is
                    // greater then column number,mark the
                    // element as 0
                    if (i > j) {
                        matrix[i][j] = 0;
                    }
                }
            }

            System.out.println(
                "Upper Triangular Matrix is given by :-");
          
            // printing the upper triangular matrix
            printMatrix(matrix);
        }
    }
    public static void main(String[] args)
    {
        int mat[][] = { { 2, 1, 4 }, { 1, 2, 3 }, { 3, 6, 2 } };
      
        // calling the function
        upperTriangularMatrix(mat);
    }
}