在showConfirmDialog之后关闭背景JFrame

Question

I am trying to write a very simple Blackjack game.

This is the class that is supposed to show the currently drawn card:

import javax.imageio.ImageIO;
import javax.swing.*;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;

public class ShowRandomCard {
    JFrame f = new JFrame();
    JPanel p = new JPanel();

public void ShowUsARandomCard() {
    f.setLayout(new BorderLayout());
    p.add(new JLabel("A Panel"));
    f.add(p, BorderLayout.NORTH);

    // Picture
    BufferedImage myPicture = null;
    try {
        myPicture = ImageIO.read(new File("somepicture"));
    } catch (IOException e) {
        e.printStackTrace();
    }
    JLabel picLabel = new JLabel(new ImageIcon(myPicture));
    f.add(picLabel,BorderLayout.NORTH);

    // elements

    f.pack();
    f.setVisible(true);

    Blackjack jt = new Blackjack();
    jt.dialog();

}

public void hideCards() {
    f.setVisible(false);
    f.remove(p);
    f.dispose();
    f.repaint();
}
}

And this is the actual game class:

import static javax.swing.JOptionPane.*;

public class Blackjack {

    ShowRandomCard it = new ShowRandomCard();

   public void dialog() {

        int answer2 = showConfirmDialog(null, "some message", "some title",
                YES_NO_OPTION);
        if (answer2 == YES_OPTION) {
            garbageCollection();
            it.ShowUsARandomCard();
        if (answer2 == NO_OPTION || answer2 == CANCEL_OPTION) {
            garbageCollection();
        //  System.exit(0);
        }
        }
   }

public void garbageCollection() {
    it.hideCards();
}
 }

But the JPanel that holds the cards does not disappear. Any help would be appreciated.

Answer 1

When you remove a component from a visible frame the basic code is:

panel.remove(...);
panel.revalidate();
panel.repaint();

However, there is rarely a good reason to use code like that. Instead you should be using a Card Layout to hide/show panels.

Method names do not start with an upper case character. "GarbageCollection()" should be GarbageCollection()