Java syntax question: O accept(ObjectVisitorEx visitor)

Question

Naive question about Java syntax. What does

<T> T accept(ObjectVisitorEx<T> visitor);

mean? What would be the C# equivalent?

Isn't that an 'O' ( oh ) rather and a '0' ( zero ) ? – OscarRyz Jun 23 '09 at 21:28 — OscarRyz, Jun 23 '09 at 21:28
It's an 'O" (oh), but it does look like a zero. – Dervin Thunk Jun 23 '09 at 21:30 — Dervin Thunk, Jun 23 '09 at 21:30
O probably isn't the best identifier... – Tom Hawtin - tackline Jun 23 '09 at 21:52 — Tom Hawtin - tackline, Jun 23 '09 at 21:52

score 2 · Answer 1 · answered Jun 23 '09 at 21:33

2

In C# it could be:

O Accept<O>(ObjectVisitorEx<O> visitor);

answered Jun 23 '09 at 21:33

bruno conde

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what's the difference between adding Accept and just Accept as the accepted answer? – Dervin Thunk Jun 23 '09 at 21:35
2

With @AgileJon's answer the class is generic. This way only the method is generic... – bruno conde Jun 23 '09 at 21:37
The original question does indeed ask about a generic method. – Tom Hawtin - tackline Jun 23 '09 at 21:50
(The difference would be more obvious if the two versions were put together (for instance by accepting this answer).) – Tom Hawtin - tackline Jun 23 '09 at 21:51

score 1 · Answer 2 · answered Jun 23 '09 at 21:30

1

This is used for passing types as parameters. C# syntax is the same (<Type>). Suggest googling for term 'generics' as this is the term you're looking for.

answered Jun 23 '09 at 21:30

quosoo

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score 1 · Accepted Answer · answered Jun 23 '09 at 21:30

1

The C# equivalent would be more or less the same. If the visitor were an interface it would be

O Accept(IObjectVisitorEx<O> visitor);

answered Jun 23 '09 at 21:30

AgileJon

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Wouldn't you need to declare O somewhere? – Tom Hawtin - tackline Jun 23 '09 at 21:47

score 1 · Answer 4 · answered Jun 23 '09 at 21:32

1

Here's a good comparison between Java and C# generics.

answered Jun 23 '09 at 21:32

Otávio Décio

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VolkerK · Answer 5 · 2009-06-23T21:36:02.270

0

see Java: http://java.sun.com/j2se/1.5.0/docs/guide/language/generics.html
and C#: http://msdn.microsoft.com/en-us/library/ms379564(VS.80).aspx
A similar C# method could be

public T Foo<T>(Queue<T> v) // Queue<T> chosen for simplicity
{
  return v.Dequeue();
}

edited Jun 23 '09 at 21:36

answered Jun 23 '09 at 21:28

VolkerK

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Java syntax question: O accept(ObjectVisitorEx visitor)

5 Answers5