How do i put an array of panels into a frame with a flow layout?

Question

I just want to have my array of Jpanels displayed in a Jframe with a flow layout, how do i do this?
thanks

Answer 1

saru88 wrote:
The problem is:
cards.setBackground(Color.red);
No, the real problem was before that. I saw SD before the stack trace in your original code, but the code 'ignored' that and continued on to the second exception you saw.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MemoryFrame extends JFrame{
     private CardPanel[] cards;
     final int noCards = 24;
     public MemoryFrame(){
          setTitle("Apple");
          Toolkit tk = Toolkit.getDefaultToolkit();
          int screenWidth = tk.getScreenSize().width;
          int screenHeight = tk.getScreenSize().height;
          int halfWidth = screenWidth/2;
          int halfHeight = screenHeight/2;
          setBounds(halfWidth/2,halfHeight/2,halfWidth-45, halfHeight+50);
          Container c = getContentPane();
          c.setLayout(new FlowLayout());
          addWindowListener(new WindowAdapter () {
               public void windowClosing(WindowEvent e) {
                    System.exit(0);
          // this creates an array for 10 CardPanels, but they all start out as 'null'
          cards = new CardPanel[noCards];
          for(int i=0; i<noCards; i++){
               try{
                    // this creates each individual CardPanel
                    cards[i] = new CardPanel();
                    cards.setBackground(Color.red);
                    // if there is an exception, it is pointless continuing
                    c.add(cards[i]);     
               }catch(Exception e){
                    System.out.println("SD");
                    e.printStackTrace();
     public static void main(String[] args) {
          // very hackish
          new MemoryFrame().setVisible(true);
class CardPanel extends JPanel {