讨论那些由java.lang定义的类和接口。正如你所知道的那样，java.lang被自动导入所有的程序。它所包含的类和接口对所有实际的Java程序都是必要的。它是Java最广泛使用的包。-Discuss those defined by the java.lang classes and interfaces. As you know it, java.lang is automatically imported all of the procedures. It contains classe