什么时候在方法右括号后加分号?

问题描述

我用 Java 编程有一段时间了，我只是第一次遇到这种语法:

public Object getSomething(){return something;};

让我感兴趣的是最后一个分号.它似乎不会导致编译器错误，据我所知不会产生运行时错误，所以它似乎是有效的语法.我什么时候会使用这种语法?或者它只是允许但通常不使用的东西?

解决方案

它被语法允许作为对无害语法错误的让步，但它并不普遍使用，并且没有任何不同的意思(与不使用分号一样).

就像一个 }; inside 一个方法(比如在一个 if 块之后)是一个空语句并且被允许，一个错误的分号outside 方法被认为是空声明并且是允许的.

具体来说，来自 Java 语言规范的以下产品 允许这样做:

ClassBodyDeclaration:;[静态] 块ModifiersOpt MemberDecl

I've been programming in Java for a while, and I've just come across this syntax for the first time:

public Object getSomething(){return something;};

What's interesting me is the final semicolon. It doesn't seem to be causing a compiler error, and as far as I know isn't generating runtime errors, so it seems to be valid syntax. When would I use this syntax? Or is it just something that is allowed but generally not used?

解决方案

It's allowed by the grammar as a concession to harmless syntax errors, but it's not generally used and doesn't mean anything different (than leaving the semicolon out).

Just as a }; inside a method (such as after an if block) is a null statement and is allowed, an errant semicolon outside a method is considered a null declaration and is allowed.

Specifically, the following production from the Java Language Specification allows this:

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