java - 还有什么允许的特殊 java 方法名称？

Question

我知道 $ 可以用作 Java 中的方法名。还有什么？

class MyClass {
    String $() {
        return "I've never been expected anyone would invoke me";
    }
}

这其实是一个实际问题。我正在寻找除 $ 之外的一个。

Answer 1

方法名称必须是有效的标识符。请参阅 Java 语言规范:3.8 Identifiers什么是有效标识符。

标识符必须以“Java 字母”开头，其余部分必须由“Java 字母或数字”字符组成。

JLS 说:

The "Java letters" include uppercase and lowercase ASCII Latin letters A-Z (\u0041-\u005a), and a-z (\u0061-\u007a), and, for historical reasons, the ASCII underscore (_, or \u005f) and dollar sign ($, or \u0024). The $ sign should be used only in mechanically generated source code or, rarely, to access pre-existing names on legacy systems.

The "Java digits" include the ASCII digits 0-9 (\u0030-\u0039).

Letters and digits may be drawn from the entire Unicode character set, which supports most writing scripts in use in the world today, including the large sets for Chinese, Japanese, and Korean. This allows programmers to use identifiers in their programs that are written in their native languages.

请特别注意，它说您不应在源代码中自己使用 $(即使它是允许的字符)。