Question

这个java程序为什么画不出图？

public class paint extends JFrame{
public paint(){
setLayout(new FlowLayout());
setLocation(0, 0);
setSize(200, 200);

setDefaultCloseOperation(DISPOSE_ON_CLOSE);
Container con=getContentPane();
con.add(new draw());

}

public static void main(String args[]){
new paint().setVisible(true);

}
class draw extends JPanel{

@Override
public void paint(Graphics g) {
// TODO 自动生成的方法存根
//super.paint(g);
g.drawRect(10, 10, 60, 60);
g.drawLine(70, 80, 180, 50);
System.out.print("fuck you");

}

}
}

Answer 1

参数设置不对,应该超范围了,好好看看方法注释.
g.drawRect(-1, 0, 10, 20);
g.drawLine(-1, 0, 10, 30);
这样就看到图像了

追问

thank you very much