JPanel和JButton

Question

I'm doing a little program for me, with NetBeans. I need no create many JButtons on a JPanel but i can't do it. The JPanel has been generated by the NetBeans editor on a JFrame (also made it by the NetBeans editor)

This is the code:

public static ArrayList<Account> accounts = Account.accounts;
public verCuenta() {
    initComponents();
    panel.setVisible(true);
    Account ac;
    JButton button;

    int size= accounts.size();

    for(int i=0;i<size;i++){
        button = new JButton(accounts.get(i).getName());
        button.setVisible(true);
        button.addActionListener(null);
        button.setPreferredSize(new Dimension(50,30));
        panel.add(button);
    }

Answer 1

I managed to get a single Button to pop up, maybe start with this first, then try to get several, then get your loop working

// Create a new button:
JButton b1 = new JButton("ok");
// Set the location and size of the button:
b1.setSize(100, 26);
// Add the button to the window:
jPanel1.add(b1);
//Repaint the Panel to make visible
jPanel1.repaint();

It only works when you set a size, just checked in Netbeans. You can also specify the location, using

b1.setLocation(100, 100);

btw, whole frame is in gridbag layout

Answer 2

you need to add all elements to the panel and then call the setVisible method.

Additions after calling the setVisible method are not per se taking into account.