Example: Matrix Pattern in Java language using For loop

// Matrix Pattern in Java language using For loop
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);

        int x, i, j, k, d = 1, m;
        // x - denotes the number of rows

        System.out.println("-----Enter the total number of rows-----");
        x = in.nextInt();

        int mat[][];
        mat = new int[x][x];
     
        for ( i = 0; i < x; i++) {
            j = i;
            k = 0;
            for ( j = i; j >= 0; j--) {
                mat[k][j] = d;
                d++;
                k++;
            }
        }

        for ( k = 1; k < x; k++) {
            i = m = k;
            for ( j = x-1; j >= m; j--) {
                mat[i][j] = d;
                d++;
                i++;
            }
        }

        System.out.println("\n-----The matrix pattern-----\n");
        for ( i = 0; i < x; i++) {
            for(j = 0; j < x; j++) {
                System.out.print(mat[i][j] + "\t");
            }
            System.out.print("\n");
        }
    }
}