java - java类编写语法

Question

以 ; 结尾的 java 类在语法上是否正确？在大多数文档中，java 类语法不以 ;

结尾

但是我成功地编译了下面的代码，

public class ClassDemo {
    public static void main (String args[]) {
        System.out.println ("Hello World!");
    }
};

我的问题是，以 ; 结束类声明是否正确？为什么会被编译器忽略，而且最后有没有;似乎都无所谓？

Answer 1

您的代码在语法上是正确的，但 ; 是不必要的。

来自JLS 7.6.

Extra ";" tokens appearing at the level of type declarations in a compilation unit have no effect on the meaning of the compilation unit. Stray semicolons are permitted in the Java programming language solely as a concession to C++ programmers who are used to placing ";" after a class declaration. They should not be used in new Java code.