Swing中paint、paintComponent和paintComponents的区别 [英] Difference between paint, paintComponent and paintComponents in Swing

问题描述

Java Swing 中 paint()、paintComponent() 和 paintComponents() 的实际区别是什么?

What is the actual difference between paint(), paintComponent() and paintComponents() in Java Swing?

我试图理解 Oracle 文档中的解释，但我不清楚.

I tried to understand what explained in Oracle docs but I am not clear.

推荐答案

• AWT，覆盖paint().
• Swing 顶级容器(例如，JFrame、JWindow、JDialog、JApplet ..)，覆盖 paint().但是有很多很好的理由不在 TLC 中绘画.一个单独问题的主题，也许.
• Swing 的其余部分(任何从 JComponent 派生的组件)，覆盖 paintComponent().
• 既不覆盖也不显式调用 paintComponents()，让 API 在需要时调用它.
• AWT, override paint().
• Swing top-level container (e.g.s are JFrame, JWindow, JDialog, JApplet ..), override paint(). But there are a number of good reasons not to paint in a TLC. A subject for a separate question, perhaps.
• The rest of Swing (any component that derives from JComponent), override paintComponent().
• Neither override nor explicitly call paintComponents(), leave it to the API to call it when needed.

确保在覆盖方法时也使用 @Override 表示法.

Be sure to also use @Override notation whenever overriding a method.

这样做会暗示在 JFrame 中试图覆盖 paintComponent(..) 的问题(它没有这样的方法)，这很常见.

Doing so would hint at the problem of trying to override paintComponent(..) in a JFrame (it has no such method), which is quite common to see.

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