what is a sealed package?

[Jking]

Hi,

I am quite confused about what is a sealed package.
In java.lang.Package, there is a method:

isSealed()

or

isSealed(URL url)

So why to seal a package ? the usage? how to make a package sealed?

Anyone could kindly explain it for me?

Thank you.

Justin

 

[Arne Vajhøj]

I am quite confused about what is a sealed package.
In java.lang.Package, there is a method:

isSealed()

or

isSealed(URL url)

So why to seal a package ? the usage? how to make a package sealed?

Anyone could kindly explain it for me?

http://java.sun.com/docs/books/tutorial/deployment/jar/sealman.html

Arne