Matrix in Forms

Question

I’m having trouble creating a matrix within a JPanel in Netbeans, I tried to customize the code by placing within the Netbeans customization code:

           jPanel1.setLayout(new GridLayout(15,15));
           JLabel[][] grid = new JLabel[15][15]; 
           for(int y=0; y<15; y++){
                   for(int x=0; x<15; x++){
                          grid[x][y]=new JLabel("("+x+","+y+")");    
                          jPanel1.add(grid[x][y]);
                   }
           }

It just doesn’t show anything, I wanted to print a matrix in the interface because I need it in the development of a game.

Answer 1

How did you say the program didn’t printa nothingness I believe it is not a problem with the choice of Layout Manager, must be missing add your Jpanel to your Jframe, so:

setContentPane(jPanel1);

However, it is my suggestion that whenever you are in doubt of which Layoutmanager to use, go to Miglayout, because it is more modern than the others, more flexible and generates less code, making it easier if you need to move the lines of code instead of just dragging the components. Source: Miglayout - Java Layout Manager

Using Miglayout instead of Gridlayout your code would look like this:

jPanel1 = new JPanel();
jPanel1.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(jPanel1);
jPanel1.setLayout(new MigLayout("", "[][]", "[]"));
JLabel[][] grid = new JLabel[15][15];
for(int y=0; y<15; y++){
    for(int x=0; x<15; x++){
        grid[x][y]=new JLabel("("+x+","+y+")");    
        jPanel1.add(grid[x][y], "cell " + x  + " " + y);
    }
}

Upshot: