How can I draw a 4×4 grid of squares in java?

I have been trying to draw a 4x4 grid of squares for about 2 days now and I can't seem to get it down.

Here's the code that I have so far:

    StdDraw.setScale(0,4);
 
    int[][] grid = new int [4][4];  

    for (int x = 0; x < grid.length; x++) {   

    for (int y = 0; y < grid.length; y++)   {     

    grid[x][y] = 16;   

    }

    }


    for (int x = 0; x < grid.length; x++) {   
    for (int y = 0; y <grid.length; y++)   {     
    StdDraw.square(2.5,3.5,1);  
  } 
 }

Unfortunately, it just displays 1 square and I don't know what else to adjust in my code to make the squares as a 4x4 grid. How can I adjust the code accordingly? Any help will be appreciated. I am also using the Dr. Java programming software.

Read more here: https://stackoverflow.com/questions/66483898/how-can-i-draw-a-4x4-grid-of-squares-in-java