Arrays

[HosHos]

How to initialize array.
If not ,how to find its lenght (size)

[Fubarable]

Your best bet for learning the basics of the language are the Sun Java tutorials and or a decent textbook. For instance, please have a look at the array tutorial: Sun Java Array Tutorial

and the tutorial "Really Big Index": Really Big Index

[HosHos]

"Really Big Index" this is exactly what i was looking for

[Eranga]

Put a bookmark in Suns' tutorial. That's all you want to learn Java in better way. ;)