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在退出我的游戏时，我想显示“退出屏幕”。该exitscreen.gif夹中，并且工作正常，但由于某些原因，只有空白帧表明这一点：Java swing JLabel没有显示
JPanel finishPanel = new JPanel();
JLabel finishLabel = new JLabel(new ImageIcon("welcomescreen.gif"));
finishPanel.add(finishLabel);
finishLabel.setSize(11 * 35, 11 * 35);
finishPanel.setPreferredSize(finishLabel.getSize());
this.frame.setVisible(false);
JFrame exitFrame = new JFrame("Thanks for playing");
exitFrame.getContentPane().add(finishPanel);
exitFrame.setLocationRelativeTo(null);
exitFrame.pack();
exitFrame.setVisible(true);
finishLabel.setVisible(true);
this.frame只是另一种的JFrame我不需要了。
