小程序中的摇摆组件不起作用

Question

When I add swing components to my applet, they don't show up. Sometimes if I move my mouse around some JButtons pop up(strange). I have a method paint(Graphics g){} and update(Graphics g){}, but even when I remove all the images and painting code, the components still don't appear. Is this something normal that happens with applets, or am I making a mistake?

Answer 1

I also had same problem, here is the solution that helped me:

In your paint(Graphics g) method to paint all containers properly use super.paint(g).

Like:

void paint(Graphics g)

{

  super.paint(g);

 //code to draw something 

}

Answer 2

It's common not in applets, but also in Java program. As far as I know, I meet with many cases like that due to the incompatibility issue. When this thing happens, minimize a window and resize it and all the objects pop up as they should. I'm not sure whether there's a solution to that. I think there should be one. This mostly happens when you have objects overlapping.

EDIT: Information maybe useful: When a window is resized in a regular java program, javax.swing.JComponent.repaint() is called.

Answer 3

Ok, I figured it out. Stupid mistake by me. I was using Applet, not JApplet.