a simple question

[Shawn]

Hi,

I am reading some Java file, which I don't understand:

Class A<B> {
B b;
A(B b) {this.b = b;}
....
} //A

A<JComponent> = new A(JButton);


I have never seen <..> after a Class name, like Class A<B>. I guess this
is some template stuff, similar to C++. Is this something new for Java
1.5 or I just didn't know before?

Thank you.

 

[Tim Ward]

I have never seen <..> after a Class name, like Class A<B>. I guess this
is some template stuff, similar to C++. Is this something new for Java
1.5

Yes.

 

[Shawn]

Yes.

Can you point to me where to pick it up? What is it for? How to use it?

Thank you.

 

[Tor Iver Wilhelmsen]

Can you point to me where to pick it up? What is it for? How to use it?

It's to get compile-time type safety. It all gets turned into Object
and casts in the end.

http://java.sun.com/developer/technicalArticles/J2SE/generics/index.html

 

[Daniel Dyer]

It's to get compile-time type safety. It all gets turned into Object
and casts in the end.

http://java.sun.com/developer/technicalArticles/J2SE/generics/index.html

Also

http://java.sun.com/j2se/1.5/pdf/generics-tutorial.pdf

Dan.