Can anyone explain what is the T,

[jacob deiter]

public abstract class Controller <T> extends Simple {

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Can anyone explain what is the <T>,

[Pawan Arora]

T is a template variable

[Jesper de Jong]

See Java 5 - Generics.

[Rob Spoor]

Jacob,

I suggest you do some searching whenever you think of a question. Quite a lot of your questions have answers that can easily be found on this board, on Wikipedia, in the Java Language Specification or Google. In other words: Search First.

[kranthi chamarthi]

T indicates Generic. Prior to java 5 when we use collections we used to specify it like
List k=new ArrayList();
There is no restriction on what you can add and what you cant add into list. You can add any type of Object into the list.
So Generics will allow you to specify what type of objects you can add into a collection.
List<Animal> k=new ArrayList<Animal>();
Now this indicates that you can add Objects of type Animal into the collection, you cannot add objects of type Human or Vehicle into it.
Generics allows to code type safe collections.
Here T indicates a Generic Type.
Hope you find it useful.

[Gyanendra Gupta]

Originally posted by kranthi kumar.chamarthi:
T indicates Generic. Prior to java 5 when we use collections we used to specify it like
List k=new ArrayList();
There is no restriction on what you can add and what you cant add into list. You can add any type of Object into the list.
So Generics will allow you to specify what type of objects you can add into a collection.
List<Animal> k=new ArrayList<Animal>();
Now this indicates that you can add Objects of type Animal into the collection, you cannot add objects of type Human or Vehicle into it.
Generics allows to code type safe collections.
Here T indicates a Generic Type.
Hope you find it useful.

[Campbell Ritchie]

Welcome to JavaRanch, Gyanendra Gupta.

But please don't simply quote somebody else's post like that; you ought to have something to add to it.