自定义组件为0x0 px。
import java.awt.*;
import javax.swing.*;
public class Catch {
public class MyGraphics extends JComponent {
private static final long serialVersionUID = 1L;
MyGraphics() {
setPreferredSize(new Dimension(500, 100));
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.fillRect(200, 62, 30, 10);
}
}
public void createGUI() {
final JFrame frame = new JFrame();
JPanel panel = new JPanel();
panel.add(new MyGraphics());
frame.add(panel);
frame.pack();
frame.setVisible(true);
frame.setDefaultCloSEOperation(JFrame.DISPOSE_ON_CLOSE);
}
public static void main(String[] args) {
EventQueue.invokelater(new Runnable() {
@Override
public void run() {
Catch GUI = new Catch();
GUI.createGUI();
}
});
}
}
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