Elements below Left Diagonal in a Square Matrix

Write a program in Java to allow the user to create a square matrix of integer type.

The value of ‘m’ is entered by the user. Ensure that 3 < m < 10.

For an invalid range, display a suitable error message.

Now allow the user to fill this matrix with integers.

Finally, once the array is full, display the elements that fall below the left diagonal.

import java.io.*;
class BelowLeft{
    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        System.out.print("M = ");
        int m = Integer.parseInt(br.readLine());
        if(m < 4 || m > 9){
            System.out.println("Invalid range!");
            return;
        }
        int a[][] = new int[m][m];
        System.out.print("Enter integers:");
        for(int i = 0; i < m; i++){
            for(int j = 0; j < m; j++){
                a[i][j] = Integer.parseInt(br.readLine());
            }
        }
        System.out.println("Original Matrix:");
        for(int i = 0; i < m; i++){
            for(int j = 0; j < m; j++){
                System.out.print(a[i][j] + "\t");;
            }
            System.out.println();
        }
        System.out.println("Elements below left diagonal:");
        for(int i = 1; i < m; i++){
            for(int j = 0; j < i; j++){
                System.out.print(a[i][j] + "\t");
            }
            System.out.println();
        }
    }
}