如何制作新网格？

Question

I'm putting a bunch of buttons into GridLayout. If I want the user to be able to change the grid size during run time, how do I generate a new grid? I tried resetting the row/cols and re-adding the buttons, but nothing changes.

Late edit of cope snippet for resizing the grid:

GridLayout layout = new GridLayout(10, 10);;

void makeGrid(int newSize) {
    for(int i = 0; i <= gridSize; i++) {
       for(int j = 0; j <= gridSize; j++) {
          layout.removeLayoutComponent(grid[i][j]);
       }
    }

    gridSize = newSize;
    layout = new GridLayout(gridSize, gridSize);
    panel.setLayout(layout);

    for(int i = 0; i <= gridSize; i++) {
       for(int j = 0; j <= gridSize; j++) {
          panel.add(grid[i][j]);
       }
    }
    pack();
}

Answer 1

try defining a separate method for displaying the buttons like,

// pane is your JPanel object
public void displayButtons(){
   pane.add(btn1);
   pane.add(btn2);
   pane.add(btn3);
   pane.add(btn4);
   pane.add(btn5);
   pane.add(btn6);
   pack(); // <- make sure you include this code
}

Then from your class listener, set a new layout then call displayButtons() method.

pane.setLayout(new GridLayout(0,2));
displayButtons();