Java重绘不能正常工作

Question

i use the java repaint method , it repaints, but the update is only seen when I either click on the canvas or resize the panel. How can I fix this ? What causes it?

Answer 1

You need to call the method revalidate(). This forces the layout manager to update / repaint all its components.

Answer 2

repaint（）实际上并没有重新绘制，它只是要求重新绘制组件。

Answer 3

It may be helpful to simply grab the Graphics object from the component you wish to paint. Then just invoke a paint method on the Graphics object. For example:

g = component.getGraphics(); 
draw(g);