Question

java这个在面板上画图怎么显示不出来

import java.awt.*;
import javax.swing.*;
import java.awt.Graphics;
public class work16_8 extends JFrame{
public work16_8(){

add(new gecoord());

}

public static void main(String[] args) {
work16_8 jframe=new work16_8();
jframe.setTitle("DJKHK");
jframe.setSize(200, 100);
jframe.setLocationRelativeTo(null);
jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
jframe.setVisible(true);

}

}
class gecoord extends JPanel {
protected void paintCompoenet(Graphics g){
super.paintComponent(g);
g.drawString("fhkhkdfhksdhk", 0, 40);
g.drawLine(0,0,50,50);
}
}

Answer 1

不是那么添加控笑冲件的，Frame里面要激升纯得到ContentPane才能添加，语句getContentPane().add(new gecoord(), BorderLayout.CENTER);
因为默认明咐的是BorderLayout布局

Answer 2

 虚弊paintCompoenet  改衫伏成  paintComponent    或誉携或者 paint

Answer 3

去除super.paintComponent(g);，或paintCompoenet改为paint，要不就是遮盖问题扰芦，画个距形脊则，别樱李棚画字符串