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:

    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++)   {     

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.

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