Question about Packages

[Huskies]

Hey guys,

I know that there is no formal sub-package in java (at least to the best of my knowledge). If I understand correctly, then "com.package1" is entirely separate and different than "com.package1.alpha".

My question is this: How do you get imports such as "javax.swing.*" without doing specifics such as "javax.swing.JFrame"?
How are they able to nest these packages?

I'm sure I am confused as to what is actually happening, so if you could inform me that would be great.

Thank you in advance!
-Huskies

[KevinWorkman]

That's not nesting packages- that's simply importing every class in a package. JFrame is not a package, it's a class.

For example, you couldn't just do this: import javax.*; and then use JFrame.

[asifzbaig]

How do you get imports such as "javax.swing.*" without doing specifics such as "javax.swing.JFrame"?

Actually, "javax.swing.*" and "javax.swing.JFrame" are two different things.

If your using "*" in impoting it means your are importing all the classes in the package "javax.swing".
Note that it only import on classes in the package rather than sub-package.
For Example if you want to import classes under sub-package of javax.swing you have to declare it as : "javax.swing.event.*;".

But, in case of writing "javax.swing.JFrame;" imports only JFrame class of javax.swing package.

For more information refer : Package Tutorial