How to arrange this 2D array diagonally with zeros around

This is the code i came up so far, the goal is to generate a table 10×10 just like in the image what i need
The problem i can’t seem to understand is why it doesn’t generate zeros and the last number 27 and just throws everything together.

public class Main {

    public static void main(String[] args) {
        int values[][] = new int [10][10];
       
      int n = 1;
        for (int i=0; i<=9; i++) {
            for (int j=9-i; j>=7-i; j--){
                 if (j >=0){
                values[i][j] = n++;
}
                 System.out.printf(values[i][j] + " ");
            }
           System.out.println();
        }
    }
}

I would appreciate any suggestions, thanks!

What is see/get — > what i see/ error

>Solution :

Your code works. You just have to fill your arrays with 0s before running your algorithm.

Take a look:

// don't forget to import java.util
import java.util.*;

public class Main {
    public static void main(String[] args) {
        int values[][] = new int [10][10];
        // here you fill the array with zeros
        for (int[] row : values) {
            for (int col : row) {
                row[col] = 0;
            }
        }
        
        // here is your algorithm
        int n = 1;
        for (int i=0; i<=9; i++) {
            for (int j=9-i; j>=7-i; j--){
                if (j >=0){
                    values[i][j] = n++;
                }
            }
        }
        
        // here you print out the array
        for (int[] row : values) {
            System.out.println(Arrays.toString(row));
        }
    }
    
}