Is there a way to make a singleton out of a generic type?  Considerthis as an example:public interface Delegate<Ret, T> {    public Ret transform(T t);}public class IdentityDelegate<T> implements Delegate<T, T> {    public T transform(T t) { return t; }}Is there a way to make a singleton out of IdentityDelegate (sinceclearly one size fits all classes) other than to just "drop thegeneric info"?

kelvSYC wrote:> Is there a way to make a singleton out of a generic type?  Consider> this as an example:> > public interface Delegate<Ret, T> {>     public Ret transform(T t);> }> > public class IdentityDelegate<T> implements Delegate<T, T> {>     public T transform(T t) { return t; }> }> > Is there a way to make a singleton out of IdentityDelegate (since> clearly one size fits all classes) other than to just "drop the> generic info"?You can make a singleton out of any class by instantiating it only once in your application.Do you consdier, say, an IdentityDelegate<String> object and an IdentityDelegate<Integer> object to be different instance of the same "singleton" or two different singletons?  In the JVM they will not differ in type because of erasure.-- Lew

On Apr 4, 2:36 pm, "kelvSYC" <kelv...@gmail.com> wrote:> Is there a way to make a singleton out of a generic type?  Consider> this as an example:>> public interface Delegate<Ret, T> {>     public Ret transform(T t);>> }>> public class IdentityDelegate<T> implements Delegate<T, T> {>     public T transform(T t) { return t; }>> }>> Is there a way to make a singleton out of IdentityDelegate (since> clearly one size fits all classes) other than to just "drop the> generic info"?Look at how java.util.Collections is emplemented (specificallyemptyList())