Java Syntax problem

Hello all,
I am studying stacks lately and I have came across a special parenthesis that i do not quite understand.
This parenthesis is " < arguments >"
Eg, private Arraylist<String> info; // in this case i know i created a reference to an expandable of array that holds string objects
public interface Stack<E> // a stack that contains generic elements.
However i still dont quite get the real use for <> parenthesis, like when are they used. It wasn't quite explained the book i am reading. And i dont know the keywords to google more info about those parentheses.
Another question would be the class E, can someone breif me a little on that please.

http://java.sun.com/docs/books/tutorial/java/generics/index.html> >
Hello all,
I am studying stacks lately and I have came across a special parenthesis that i do not quite understand.
This parenthesis is " < arguments >"
Eg, private Arraylist<String> info; // in this case i know i created a reference to an expandable of array that holds string objects
public interface Stack<E> // a stack that contains generic elements.
However i still dont quite get the real use for <> parenthesis, like when are they used. It wasn't quite explained the book i am reading. And i dont know the keywords to google more info about those parentheses.
Another question would be the class E, can someone breif me a little on that please.
Those are just the less than and greater than sign on your keyboard. They are used in the implementation of Java Generics and, very simply put, you put the Class that you want the Generic to service between "<>".
For instance:
private ArrayList<String> asl = new ArrayList<String)();Says to create an ArrayList that will contain String values.
Generics are discussed here in the tutorial: Generics

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