Must we uses generics always

Hi,
We are using eclipse as a tool with java 1.5 development.
But the tool issues warning for the below code.
ArrayList list = new ArrayList();The problem is it is expecting
ArrayList[u]<E>[/u] list = new ArrayList();Is it wrong to ignore using the "Generics".
Or does it in anyway make the code non-compliant with 1.5.
I dont feel the need to use Generics,
so cant i ignore it ?
Any thoughts on this matter are appreciated.
Regards,
Shailesh

Is this the Java Kindergarden?In my experience, mostly yes.
Of course, one can use Java the raw fashion. The fact that you can doesn't make it a good idea. Generics are one of the most beneficial new feature in Java.
Generics
"only" provide some compile-time type safety in many
situations, but not all of them. Often enough, you
will work with bound types or even wildcards, which
not helps much.In most cases compile-time is the best time to be as safe as possible.
It surely is possible to safely develop applications
with less or no types (e.g. dynamic typing, cf. Ruby,
Smalltalk, Python etc.).Of course it is, it's also easier to make mistakes which burn you at runtime.
It all depends on who will
write the code, who will maintain the code, and how
experienced the developers are.In which case I find it best to assume the worst.
Comparisons to assembler or register manipulations
are quite off. Types alone do not guarantee a stable
or maintainable application.But they do help.

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Where and when to use generics?

I'm brushing up on Java 5.0, I'm at 'generics' - I always hated c++ templates and knew they would catch up with me sooner or later...
I have a fairly simple question about where and how to use them, conceptually.
Am I correct in thinking that they are primarily concerned with items contained within a class and passed to a class?
I'm trying to find a useful bit of code to write to practice with them and I've been half tempted to re-write something that uses lots of inheritance simply because I know the code in question needed a lot of casting, but my gut feeling is that generics doesn't have an awful lot to do with inheritance and re-jigging a class that relied on inheritance to use generics is barking up the wrong tree.
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IMO the most useful feature of using Generics is compile time typesafety.
Consider the pre-1.5 code for making a LinkedList that contains strings:
LinkedList l = new LinkedList();
l.add("Hello world!");
l.add(new Integer(100)); // <---- runtime exceptionInstead, you can now write the code like this:
LinkedList<String> l = new LinkedList<String>();
l.add("Hello world!");
l.add(new Integer(100)); // compile time exceptionIf you accidentally put the wrong type in a Collection you will get a nice compile time exception instead of a ClassCastException at runtime.

variable-class using Generic Collection

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Thanks man, sorry it must seem obvious to you, but
for some reason I couldn't get it to work.No. The first time I also had to ask.
Now an even more difficult (for me) question: how
would you refer to that method in a @see or {@link
..} javadoc comment?Manually erase the method:
* The see tag refers to this method
* @param <T> a type variable
* @see #foo(Object)
<T> void foo(T t) {}

Identity must not be Generic

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When I try to get the list of events by WCF with the service "http://servername/_vti_bin/PSI/ProjectServer.svcon the activate of the feature, I got in the ULS the error "Identity must
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Thank you in advance.

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Your question makes no sense.
The value you posted represents the name of a particular JDBC driver.
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Hi,
i've got a question about using generic types in combination with subclassing (which should be used in a cellular automaton),
In fact there are only 3 classes that are necessary to understand my problem:
- Cell (abstract)
- CellularAutomaton
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public abstract class Cell [
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public String getStr() {}
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public T getLeftNeighbor(T cell) { ... } // gets the left neighbor of the given cell
public T getRightNeighbor(T cell) { ... } // gets the left neighbor of the given cell
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public abstract class Cell<T extends Cell<?>> [
public void performCellAction(CellularAutomaton<T> ca) {}
public class SubclassedCell extends Cell<SubclassedCell> {
private String str;
performCellAction(CellularAutomaton<SubclassedCell> ca) {
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public String getStr() {}
}However, even in this "working" solution i get a compiler warning at the method CellularAutomaton->computer():
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Is there a betted way to achieve the goal to access left.getStr() in the performCellAction of the subclassed cell??
Regards,
Niko

I thought of that myself, but if i do this, i get the following error:
The method performCellAction(CellularAutomaton<capture#1-of ?>) in the type Cell<capture#1-of ?> is not applicable for the arguments (CellularAutomaton<T>)

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Edited by: BHUWAN TIWARI on Feb 8, 2011 4:16 PM
Edited by: BHUWAN TIWARI on Feb 8, 2011 4:16 PM

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Thanks
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Hello,
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EXPORTING
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http://help-abap.blogspot.com/2009/02/generic-object-services-gos-toolbar.html

Must we uses generics always

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