我正在尝试使用Graphics
2D画一条线但是然后该线出现在所有的线上
JFrame
中的其他组件因此使它们不可见。我该如何解决这个问题?
以下是代码:
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
class Success extends JFrame{
public Success(){
JPanel panel=new JPanel();
getContentPane().add(panel);
setSize(450,450);
JButton button =new JButton("press");
panel.add(button);
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
Line2D lin = new Line2D.Float(100, 100, 250, 260);
g2.draw(lin);
}
public static void main(String []args){
Success s=new Success();
s.setVisible(true);
}
}
答案 0 :(得分:10)
import javax.swing.*;
import java.awt.*;
import java.awt.geom.*;
class Success extends JFrame{
public Success(){
JPanel panel=new JPanel();
getContentPane().add(panel);
setSize(450,450);
JButton button =new JButton("press");
panel.add(button);
}
public void paint(Graphics g) {
super.paint(g); // fixes the immediate problem.
Graphics2D g2 = (Graphics2D) g;
Line2D lin = new Line2D.Float(100, 100, 250, 260);
g2.draw(lin);
}
public static void main(String []args){
Success s=new Success();
s.setVisible(true);
}
}
JPanel
,覆盖paintComponent(Graphics)
而不是paint()
。再次,首先调用super
方法。pack()