BorderLayout West Center East all Equal width

Question

I am adding objects dynamically to panels then adding to the my border layout. I need the West, Center and East all to be equal size. This is what I have so far:

static int width = 300;//Screen width
static int height = width / 16 * 9;//Screen height
static int scale = 3;

private JFrame frame;

//player is an object from a Player Class will an arrayList of Items.. 
public void LoadPlayer(Player player){
int count = 1;
for (Items i : player.getAllItems()){
    JPanel jp= new JPanel();
    JLabel jlItem= new JLabel(i.getName());
    BorderLayout bl = (BorderLayout) (mainPanel.getLayout()) ;
    jp.add(jlItem);
    jp.setBorder(BorderFactory.createLineBorder(Color.BLACK));

    if (bl.getLayoutComponent(BorderLayout.WEST)  == null){
        mainPanel.add(jp,BorderLayout.WEST);
        jp.setSize(frame.getWidth()/3, height);
        System.out.println("adding item " + count+" to west panel");
    }
    else if (bl.getLayoutComponent(BorderLayout.CENTER)  == null){
        jp.setSize(frame.getWidth()/3, height);
        mainPanel.add(jp,BorderLayout.CENTER);
        System.out.println("adding item " + count+" to center panel");
    }
    else if (bl.getLayoutComponent(BorderLayout.EAST)  == null){
        mainPanel.add(jp.BorderLayout.EAST);
        jp.setSize(frame.getWidth()/3, height);
        System.out.println("adding item" + count+" to east panel");
    }
    count++;
}
}

I was hopeful this would work but it didn't. I've done a bit of searching and can't seem to find anything that says you can or can't set the size of the WEST, CENTER and EAST panels. Does anyone know how to do this ?

Answer 1

I need the West, Center and East all to be equal size..

A single row GridLayout in the BorderLayout.CENTER of a nested layout will achieve that.

Answer 2

You never use the setSize() method on a component. That is the job of the layout manager.

If you want the panels to be the same size you can use a GridLayout.