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[Max White]

I'm trying to think, what does Java do that C# doesn't? Apart from run on your microwave...

Well there is that thing where inner classes intrinsically have access to their outer class, but that is easy to work around. Na it should be pretty easy to translate all lessons from Java over to c#, and if not then people can just ask for help.

I guess the biggest problem would be people doing things the over complicated Java way, such as using for loops on their lists instead of a foreach loop.

[Mego]

Hey, I'm reading your tutorials. Granted, we've already covered quite a bit of this stuff in my class, but I find it's good to go back to basics every so often.

I'm trying to think, what does Java do that C# doesn't? Apart from run on your microwave...

Well there is that thing where inner classes intrinsically have access to their outer class, but that is easy to work around. Na it should be pretty easy to translate all lessons from Java over to c#, and if not then people can just ask for help.

I guess the biggest problem would be people doing things the over complicated Java way, such as using for loops on their lists instead of a foreach loop.

For loops have some advantages over foreach loops. For one (no pun intended), you have your index right there, instead of having to use indexOf, which will only always work properly when used with sets.

[Max White]

And in the case that you require the index, you can use a for loop.
Still, being able to run a foreach on your own data tree is pretty sexy.

[Stargrasper]

Thanks Mago.  Nice to know there are exactly two people reading my lessons.

I guess neither of you are familiar with the Java alternate for loop.  It's a foreach loop, basically.

Code: [Select]

for ( datatype instanceName : datastructure)


Code: [Select]

int[] num = { 1, 2, 3, 4, 5 };

for (int cur : num)
     System.out.println(cur);

Also works with objects.

Code: [Select]

List<Integer> numbers = new ArrayList<Integer>();
for(int i = 0; i < 5; i++) {
numbers.add(i);
}
for(Integer cur : numbers) {
System.out.println(cur);
}


[Max White]

Also works with objects.

Code: [Select]

List<Integer> numbers = new ArrayList<Integer>();
for(int i = 0; i < 5; i++) {
numbers.add(i);
}
for(Integer cur : numbers) {
System.out.println(cur);
}


That works? What interface do I need to implement to make it work for my own stuff?

[Stargrasper]

Also works with objects.

Code: [Select]

List<Integer> numbers = new ArrayList<Integer>();
for(int i = 0; i < 5; i++) {
numbers.add(i);
}
for(Integer cur : numbers) {
System.out.println(cur);
}


That works? What interface do I need to implement to make it work for my own stuff?

Java does not make you implement any interfaces.  Just import the objects you need; in my example, you need to import List and ArrayList.  Apparently Integer comes free without having to import it.  The syntax for both for loops also comes free without imports/inheritance/interfaces.

[Max White]

Yes I know there are collections you can just use, but what if I want to use my own? So, for example...

Code: [Select]

Level level = LevelFactory.BuildTestLevel();
for (Actor a : level)
{
a.Update();
}
In this example I am using a level object that I made myself as a wrapper for the actors that would be part of a game. But this doesn't just work as is, the Level class would need to implement an interface. Do you know what interface?

[MorleyDev]

Iterable: http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/Iterable.html
"Implementing this interface allows an object to be the target of the "foreach" statement."

[Max White]

Ah, thank he kindly good sir.

[Stargrasper]

Yes I know there are collections you can just use, but what if I want to use my own? So, for example...

Code: [Select]

Level level = LevelFactory.BuildTestLevel();
for (Actor a : level)
{
a.Update();
}
In this example I am using a level object that I made myself as a wrapper for the actors that would be part of a game. But this doesn't just work as is, the Level class would need to implement an interface. Do you know what interface?

For your excerpt to work, I think Level would need to implement Collection<T> or Iterable<T>.  Implementing Collection implies implementing Iterable as a superinterface.

[Max White]

Yea but Java doesn't support multiple class inheritance, and I program to interfaces when ever possible anyway. No point extending Collection.

[Stargrasper]

Yea but Java doesn't support multiple class inheritance, and I program to interfaces when ever possible anyway. No point extending Collection.

Java considers Collection to be an interface...and implementing Collection implies implementing Iterable because Collection itself implements Iterable...and you can implement as many interfaces as you want in Java anyway.

[Max White]

Collection is an interface? I thought it was an abstract class.
Well that works.

[Stargrasper]

Collection is an interface? I thought it was an abstract class.
Well that works.

I actually looked that up before writing that earlier post.  Collection is an interface.  Collections is an abstract class full of static methods that only work on things that implement Collection.

[Max White]

Sweet goowy libraries...