자바 GUI setVisible(true)이 안되는 문제

Question

자바 GUI를 이용해서 카드매칭게임을 만들던 감자입니다.지난번 이와 비슷한 문제가 일어나서 버전과 툴을 모두 업데이트하는 과정 중 이전 코드를 날려먹고 다시 만들고 있었습니다...하지만 멍청한 놈은 똑같은 실수를 반복한다죠.. 그때와 같이 버튼이 나타나지 않습니다.. 초기화도 하고, 이미지 경로도 틀리지 않았고, 패널 정의도 했는데 왜이럴까요..?제가 볼때 문제 있는 객체는 굵은 글씨로 두겠습니다.package game;import javax.swing.*;import java.awt.*;import java.util.Timer;import java.util.TimerTask;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class CardMatchingGame { private JFrame frame; private JPanel currentPanel; private JPanel leftPanel; private Timer gameTimer; private int playTime; private int cardsRemaining; private int cardPairs; private Card firstSelectedCard; private Card secondSelectedCard; private int countdownSeconds = 3; public CardMatchingGame() { frame = new JFrame("카드 뒤집기 게임"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(1600, 900); // 왼쪽 패널 (메인 메뉴) leftPanel = new JPanel(new BorderLayout()); leftPanel.setBackground(new Color(255, 250, 220)); JLabel title = new JLabel("카드 뒤집기"); title.setFont(new Font("SansSerif", Font.BOLD, 32)); title.setHorizontalAlignment(SwingConstants.CENTER); leftPanel.add(title, BorderLayout.NORTH); // 오른쪽 패널 (게임 화면) JPanel rightPanel = new JPanel(new BorderLayout()); // 게임 초기 화면 rightPanel.setBackground(Color.WHITE); JLabel gameLabel = new JLabel("게임 화면"); gameLabel.setFont(new Font("SansSerif", Font.BOLD, 24)); gameLabel.setHorizontalAlignment(SwingConstants.CENTER); rightPanel.add(gameLabel, BorderLayout.CENTER); JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftPanel, rightPanel); splitPane.setDividerLocation(300); // 분할 위치 조절 frame.add(splitPane); frame.setVisible(true); } public void showMainMenu() { leftPanel = new JPanel(new BorderLayout()); JPanel leftPanel = new JPanel(); leftPanel.setLayout(new BoxLayout(leftPanel, BoxLayout.Y_AXIS)); // 화면 상단에 게임 제목 표시 JLabel title = new JLabel("카드 뒤집기"); title.setFont(new Font("SansSerif", Font.BOLD, 32)); title.setAlignmentX(Component.CENTER_ALIGNMENT); leftPanel.add(title); // 게임 시작 버튼 ImageIcon startButtonImage = new ImageIcon("C:/game_file/start.png"); JButton startButton = new JButton(startButtonImage); startButton.setAlignmentX(Component.CENTER_ALIGNMENT); startButton.setBorderPainted(false); startButton.setFocusPainted(false); startButton.setContentAreaFilled(false); startButton.addActionListener(e -> showDifficultyMenu()); leftPanel.add(startButton); // 게임 종료 버튼 ImageIcon exitButtonImage = new ImageIcon("C:/game_file/quit.png"); JButton exitButton = new JButton(exitButtonImage); exitButton.setAlignmentX(Component.CENTER_ALIGNMENT); exitButton.setBorderPainted(false); exitButton.setFocusPainted(false); exitButton.setContentAreaFilled(false); exitButton.addActionListener(e -> System.exit(0)); leftPanel.add(exitButton); currentPanel.add(leftPanel, BorderLayout.WEST); frame.add(currentPanel); frame.setVisible(true); } public void showDifficultyMenu() { currentPanel = leftPanel; frame.getContentPane().removeAll(); currentPanel = new JPanel(); currentPanel.setLayout(new BoxLayout(currentPanel, BoxLayout.Y_AXIS)); JLabel title = new JLabel("카드 뒤집기"); title.setFont(new Font("SansSerif", Font.BOLD, 32)); title.setAlignmentX(Component.CENTER_ALIGNMENT); currentPanel.add(title); ImageIcon beginnerButtonImage = new ImageIcon("C:/game_file/초보.png"); JButton beginnerButton = new JButton(beginnerButtonImage); beginnerButton.setBorderPainted(false); beginnerButton.setFocusPainted(false); beginnerButton.setContentAreaFilled(false); beginnerButton.addActionListener(e -> startDifficultyCountdown(6, 5, 0, 15)); ImageIcon intermediateButtonImage = new ImageIcon("C:/game_file/중수.png"); JButton intermediateButton = new JButton(intermediateButtonImage); intermediateButton.setBorderPainted(false); intermediateButton.setFocusPainted(false); intermediateButton.setContentAreaFilled(false); intermediateButton.addActionListener(e -> startDifficultyCountdown(8, 6, 0, 24)); ImageIcon expertButtonImage = new ImageIcon("C:/game_file/고수.png"); JButton expertButton = new JButton(expertButtonImage); expertButton.setBorderPainted(false); expertButton.setFocusPainted(false); expertButton.setContentAreaFilled(false); expertButton.addActionListener(e -> startDifficultyCountdown(8, 8, 180, 32)); ImageIcon masterButtonImage = new ImageIcon("C:/game_file/쌉고수.png"); JButton masterButton = new JButton(masterButtonImage); masterButton.setBorderPainted(false); masterButton.setFocusPainted(false); masterButton.setContentAreaFilled(false); masterButton.addActionListener(e -> startDifficultyCountdown(10, 8, 120, 40)); Box buttonBox = Box.createHorizontalBox(); buttonBox.add(Box.createHorizontalGlue()); buttonBox.add(beginnerButton); buttonBox.add(intermediateButton); buttonBox.add(expertButton); buttonBox.add(masterButton); currentPanel.add(Box.createVerticalGlue()); currentPanel.add(buttonBox); currentPanel.add(Box.createVerticalGlue()); frame.add(currentPanel); frame.setVisible(true); } private void startDifficultyCountdown(int rows, int cols, int timeLimit, int totalPairs) { frame.getContentPane().removeAll(); currentPanel = new JPanel(); currentPanel.setLayout(new BoxLayout(currentPanel, BoxLayout.Y_AXIS)); JLabel countdownLabel = new JLabel("게임 시작까지 " + countdownSeconds + "초..."); countdownLabel.setFont(new Font("SansSerif", Font.BOLD, 24)); countdownLabel.setAlignmentX(Component.CENTER_ALIGNMENT); currentPanel.add(countdownLabel); frame.add(currentPanel); frame.setVisible(true); Timer countdownTimer = new Timer(); countdownTimer.schedule(new TimerTask() { @Override public void run() { countdownLabel.setText("게임 시작까지 " + countdownSeconds + "초..."); countdownSeconds--; if (countdownSeconds < 0) { countdownTimer.cancel(); startGame(rows, cols, timeLimit, totalPairs); } } }, 0, 1000); } public void startGame(int rows, int cols, int timeLimit, int totalPairs) { countdownSeconds = 3; frame.getContentPane().removeAll(); currentPanel = new JPanel(new GridLayout(rows, cols)); cardsRemaining = rows * cols; cardPairs = totalPairs; playTime = timeLimit; List cardList = createCardPairs(totalPairs); Collections.shuffle(cardList); for (Card card : cardList) { JButton cardButton = createCardButton(card); currentPanel.add(cardButton); } if (playTime > 0) { startGameTimer(); } flipAllCardsToBack(); frame.add(currentPanel); frame.setVisible(true); } private void startGameTimer() { gameTimer = new Timer(); gameTimer.scheduleAtFixedRate(new TimerTask() { @Override public void run() { playTime--; if (playTime < 0) { gameTimer.cancel(); showGameOver(false); } } }, 1000, 1000); } private void showGameOver(boolean success) { frame.getContentPane().removeAll(); currentPanel = new JPanel(); currentPanel.setLayout(new BoxLayout(currentPanel, BoxLayout.Y_AXIS)); JLabel messageLabel = new JLabel(success ? "게임 성공!" : "게임 실패"); messageLabel.setFont(new Font("SansSerif", Font.BOLD, 24)); messageLabel.setAlignmentX(Component.CENTER_ALIGNMENT); currentPanel.add(messageLabel); ImageIcon restartButtonImage = new ImageIcon("C:/game_file/restart.png"); JButton restartButton = new JButton(restartButtonImage); restartButton.setBorderPainted(false); restartButton.setFocusPainted(false); restartButton.setContentAreaFilled(false); restartButton.addActionListener(e -> showDifficultyMenu()); ImageIcon returnButtonImage = new ImageIcon("C:/game_file/home.png"); JButton returnButton = new JButton(returnButtonImage); returnButton.setBorderPainted(false); returnButton.setFocusPainted(false); returnButton.setContentAreaFilled(false); returnButton.addActionListener(e -> showMainMenu()); Box buttonBox = Box.createHorizontalBox(); buttonBox.add(Box.createHorizontalGlue()); buttonBox.add(restartButton); buttonBox.add(returnButton); buttonBox.add(Box.createHorizontalGlue()); currentPanel.add(Box.createVerticalGlue()); currentPanel.add(buttonBox); currentPanel.add(Box.createVerticalGlue()); frame.add(currentPanel); frame.setVisible(true); } private List createCardPairs(int totalPairs) { List cardList = new ArrayList<>(); for (int i = 0; i < totalPairs; i++) { cardList.add(new Card(i)); cardList.add(new Card(i)); } return cardList; } private JButton createCardButton(Card card) { JButton cardButton = card.getButton(); cardButton.addActionListener(e -> handleCardClick(cardButton, card)); cardButton.putClientProperty("card", card); return cardButton; } private void handleCardClick(JButton cardButton, Card card) { if (!card.isFaceUp) { cardButton.setIcon(new ImageIcon("C:/game_file/card_" + card.getValue() + ".png")); card.isFaceUp = true; if (firstSelectedCard == null) { firstSelectedCard = card; } else if (secondSelectedCard == null) { secondSelectedCard = card; if (firstSelectedCard.getValue() == secondSelectedCard.getValue()) { firstSelectedCard = null; secondSelectedCard = null; cardsRemaining -= 2; if (cardsRemaining == 0) { gameTimer.cancel(); showGameOver(true); } } else { Timer timer = new Timer(); timer.schedule(new TimerTask() { @Override public void run() { cardButton.setIcon(new ImageIcon("C:/game_file/card_back.png")); card.isFaceUp = false; firstSelectedCard.getButton().setIcon(new ImageIcon("C:/game_file/card_back.png")); firstSelectedCard.isFaceUp = false; firstSelectedCard = null; secondSelectedCard = null; timer.cancel(); } }, 2000); } } } } private void flipAllCardsToBack() { for (Component component : currentPanel.getComponents()) { if (component instanceof JButton) { JButton cardButton = (JButton) component; Card card = (Card) cardButton.getClientProperty("card"); cardButton.setIcon(new ImageIcon("C:/game_file/card_back.png")); card.isFaceUp = false; } } } class Card { private int value; private boolean isFaceUp; private JButton button; public Card(int value) { this.value = value; this.isFaceUp = false; this.button = new JButton(); this.button.setPreferredSize(new Dimension(200, 300)); this.button.setMargin(new Insets(0, 0, 0, 0)); this.button.setBorderPainted(false); this.button.setFocusPainted(false); this.button.setContentAreaFilled(false); } public JButton getButton() { return button; } public int getValue() { return value; } } public static void main(String[] args) { SwingUtilities.invokeLater(() -> { new CardMatchingGame(); }); }}

자바 GUI setVisible(true)이 안되는 문제

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