★★Java質問･相談スレッド184★★

★★Java質問･相談スレッド184★★ (371ﾚｽ)
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227: デフォルトの名無しさん (ﾜｯﾁｮｲ ff60-ljUV) [] 2023/11/11(土) 20:17:07.76 ID:XF4CbZuB0

背景が黒くならないのは何故でしょうか？
public class ImageViewer extends JPanel implements Runnable {
private static int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
private static int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
private Thread thread;
public ImageViewer() {
thread = new Thread(this);
thread.start();
}
@Override
public void run() {
while (true) {
repaint();
}
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
g2.setBackground(Color.BLACK);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame();
frame.getContentPane().add(new ImageViewer());
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setBounds(0, 0, screenWidth / 2, screenHeight / 2);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}});}}

http://mevius.5ch.net/test/read.cgi/tech/1632019965/227

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