为什么Java在语句结尾处不显示双分号错误？ [英] Why does Java not show an error for double semicolon at the end of a statement?

问题描述

我不小心写了一个带有两个分号的java语句。 java编译器没有显示任何错误，它会运行。

I accidentally wrote a java statement with two semicolons at the end. The java compiler does not show any error and it runs.

代码：

System.out.println("Length after delete the text is "+name.length());;

出于学习目的，我尝试在分号后添加不同的字符，java编译器显示了编译时间错误为令牌上的语法错误），删除此令牌。

For learning purposes I tried adding different characters after the semicolon, and the java compiler has shown the compile time error as Syntax error on token ")", delete this token.

此声明：

System.out.println("Length after delete the text is "+name.length());)

为什么java将分号和其他字符视为不同？

Why does java treat the semicolon and other characters as different?

推荐答案

因为双分号不是双分号，而是分号加空语句。并且一个没有任何作用的空语句不是错误。

Because a double semicolon is not treated as a double semicolon but as a semicolon plus an empty statement. And an empty statement, which does nothing, is not an error.

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