package、jar和访问控制 包
在java中没有不属于包的类，因此在真正的开发中必须要让每个类文件存放在包中。
javac -d . PackageDemo01.java ????自动打包，并生成包层次
java org.xiazdong.PackageDemo01 ????执行，加上包名称。
import 包名称.子包名称.类名称;
import 包名称.子包名称.*；
import static 包.类.*; 导入该类的所有静态方法。
示例代码：
Demo.java:
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