Java 如何决定何时导入? [英] How does Java decide when to import?

问题描述

为什么Java不需要导入Integer、String等类，而需要导入其他类?

Why doesn't Java need to import classes like Integer, String, etc. while it needs to import other classes?

推荐答案

java.lang.* 有一个隐式导入.

来自 Java 规范:

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.

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.

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