java 如何在java程序中导入用户定义的包？
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how to import user defined packages in java program?
提问by vinoth kumar
some.java
import A.A1.*;
Directory structure
A
|_A2
| |_some.java
|_A1
|_someother files and java files
but import statement didn't work. What is the reason?
但导入语句不起作用。是什么原因？
回答by jrharshath
I hope Ais not your current directory.
我希望A不是你当前的目录。
Perhaps you already know that packages work with directory heirarchies.
也许您已经知道包与目录层次结构一起使用。
<curr-dir>
|-A
| |-A1
| | |- Class1.class
| | `- Class2.class
| `-A2
| |-Class3.class
| `-Class4.class
`-<other dirs>
Now if <curr-dir>is in your classpath then import A.A1.*will import Class1 and Class2.
现在，如果<curr-dir>在您的类路径中，import A.A1.*则将导入 Class1 和 Class2。
Hope that is detailed enough :)
希望足够详细:)
回答by Barbarrosa
Any class in a given package must have a package statement, and must be declared public (in most cases) to be read outside the package:
给定包中的任何类都必须有一个包语句，并且必须声明为 public（在大多数情况下）才能在包外读取：
package A.A1;
public class ClassName{}
回答by Asha
package A.A1;
包 A.A1;
import A.A2.*;
进口A.A2.*；
public class ex2{}
公开课 ex2{}
回答by Nullpointer
Dude *(star operator) does not work for user created packages! you need to import each class individually..
Dude *(star operator) 不适用于用户创建的包！您需要单独导入每个类..
