Frame我在通过 a画一条简单的线时遇到了一些问题JButton。仅当我使用JButton. 如果我直接使用JPanel里面的Frame,一切都OK。
JFrame:
import javax.swing.*;
import java.awt.*;
public class Fenetre extends JFrame {
public Fenetre(){
super("Test");
init();
pack();
setSize(200,200);
setLocationRelativeTo(null);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
private void init() {
JPanel panel = new JPanel();
panel.setLayout(new FlowLayout());
JButton button = new JButton("Draw line");
button.addActionListener((e)->{
Pane s = new Pane();
panel.add(s);
s.repaint();
});
panel.setBackground(new Color(149,222,205));
add(button,BorderLayout.SOUTH);
add(panel,BorderLayout.CENTER);
}
public static void main(String[] args){
new Fenetre();
}
}
并且JPanel与paintComponents():
import javax.swing.*;
import java.awt.*;
public class Pane extends JPanel {
public void paintComponents(Graphics g){
super.paintComponents(g);
g.drawLine(0,20,100,20);
}
}
墨色风雨
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