令牌“包”上的语法错误，预期导入（Java）(Syntax error on token “package”, import expected (Java))

令牌“包”上的语法错误，预期导入（Java）(Syntax error on token “package”, import expected (Java))

我想尝试在Eclipse中导入Java中的java.lang.Math，并在标题中出现错误。 这是我的代码的开始：

import java.lang.Math; package test1;

这个错误在“package test1;”下弹出

I am trying trying to import java.lang.Math in Java on Eclipse and am getting the error in the title. Here is the beginning of my code:

import java.lang.Math; package test1;

This error is popping up under "package test1;"

最满意答案

package必须首先在文件中package声明，甚至包括导入：

package hw1; import java.lang.Math;

另外，你不需要导入java.lang.Math或者java.lang任何东西。

JLS第7章说：

编译单元自动访问其包中声明的所有类型，并自动导入预定义包java.lang中声明的所有公共类型。

The package statement must be first in the file, before anything, even imports:

package hw1; import java.lang.Math;

Plus, you don't need to import java.lang.Math, or anything in java.lang for that matter.

The JLS, Chapter 7 says:

A compilation unit automatically has access to all types declared in its package and also automatically imports all of the public types declared in the predefined package java.lang.