Color.red和Color.RED之间的差异 [英] Difference between Color.red and Color.RED

问题描述

setXxx（Color.red）和 setXxx（Color.RED）的定义之间的真正区别是什么？

What's the real difference between definitions for setXxx(Color.red) and setXxx(Color.RED)?

我在网上找到了以下说明。是关于命名约定吗？

I've found the following explanation on the web. Is it all about naming conventions?

Java最初定义了一些小写的颜色常量名称，违反了大写使用常量的命名规则。它们可用于所有版本的Java：Color.black，Color.darkGray，Color.gray，Color.lightGray，Color.white，Color.magenta，Color.red，Color.pink，Color.orange，Color.yellow，Color .green，Color.cyan，Color.blue

Java originally defined a few color constant names in lowercase, which violated the naming rule of using uppercase for constants. They are available in all versions of Java: Color.black, Color.darkGray, Color.gray, Color.lightGray, Color.white, Color.magenta, Color.red, Color.pink, Color.orange, Color.yellow, Color.green, Color.cyan, Color.blue

Java 1.4为常量添加了正确的大写名称：Color.BLACK，Color.DARK_GRAY，Color.GRAY，Color.LIGHT_GRAY ，Color.WHITE，Color.MAGENTA，Color.RED，Color.PINK，Color.ORANGE，Color.YELLOW，Color.GREEN，Color.CYAN，Color.BLUE

Java 1.4 added the proper uppercase names for constants: Color.BLACK, Color.DARK_GRAY, Color.GRAY, Color.LIGHT_GRAY, Color.WHITE, Color.MAGENTA, Color.RED, Color.PINK, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.CYAN, Color.BLUE

推荐答案

有代码本身：

public final static Color red = new Color(255, 0, 0);

public final static Color RED = red;

大写字母在JDK 1.4中引入（以符合其命名约定， strong>必须以大写字母表示）。

The upper case letters were introduced in JDK 1.4 (to conform to its naming convention, stating that constants must be in upper-case).

实质上，没有区别（除了信封）。

In essence, there are no difference at all (except letter casing).

如果我真的勇敢，Oracle可能会疯狂并删除较低的常量，但那将打破所有其他的代码前面的JDK 1.4。你永远不知道，我建议坚持大写字母的常数。它首先必须被弃用（如Andrew Thompson所述）。

If I want to really be brave, Oracle might go wild and remove constants that is lower-cased, but then that would break all other code that's written pre-JDK 1.4. You never know, I would suggest sticking to uppercase letters for constants. It first has to be deprecated though (as mentioned by Andrew Thompson).

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