AWT中Canvas的用途是什么？

Question

I've been searching many sources yet I still cannot find a decent explanation. Why should I use it, what is its' purpose and why does it differ from JPanels and such?

Answer 1

From my understanding, Canvas is just the AWT version of Swing's JComponent. You shouldn't use it directly, unless you're making a pure AWT app. You can find more info here .

Answer 2

The speciality of Canvas is that, like Window, it can provide customized hardware-accelerated double-buffering and page-flipping. See BufferStrategy .

A canvas is for drawing on, basically. It also serves like a Panel for creating a custom AWT-based component, but unlike Panel it can't contain other components.

Answer 3

public class Canvas
extends Component
implements Accessible

A Canvas component represents a blank rectangular area of the screen onto which the application can draw or from which the application can trap input events from the user. An application must subclass the Canvas class in order to get useful functionality such as creating a custom component. The paint method must be overridden in order to perform custom graphics on the canvas.

A canvas is for drawing on, basically. It also serves like a Panel for creating a custom AWT-based component, but unlike Panel it can't contain other components.