java.util.List

[r035198x]

[QUOTE=shana07]TQ.Pretty understood List now and also I read List is an interface from a Collection.
Then, how about an ArrayList can contain other lists .....as what you said?

All I can say is an ArrayList can contain other lists as elements as well.

 ArrayList list = new ArrayList(); 
list(0) = new ArrayList();

Coz, my aim here is to create many ArrayList (or list - not sure) with the same variable (ifs1) in loop.
again, not sure this is possible or not.....

If you want to create many ArrayLists (they are also lists since ArrayList implements List) then just do as I posted earlier

either

ArrayList<ArrayList> lists = new ArrayList<ArrayList>(); //preferrable

or

 ArrayList lists = new ArrayList();

Then add the lists at their positions with

 lists(i) = new ArrayList();

[shana07]

ArrayList<ArrayList> ifs1 = new ArrayList<ArrayList>(); //preferrable

found an error:
java.util.Array List does not take parameters

ArrayList ifs1 = new java.util.ArrayList();
......
int ch = getNumber();
ifs1(ch) = new ArrayList();

error: cannot find symbol
symbol : method ifs1(int)

[r035198x]

ArrayList<ArrayList> ifs1 = new ArrayList<ArrayList>(); //preferrable

found an error:

java.util.Array List does not take parameters

ArrayList ifs1 = new java.util.ArrayList();

......

int ch = getNumber();

ifs1(ch) = new ArrayList();

error: cannot find symbol

symbol : method ifs1(int)

Yeah it is supposed to be

 ArrayList list = new ArrayList(); 

ifs1.set(index, list);

[shana07]

just to let you know I'm still working on it..by the way,
making such code, how's the result should I get..
is that creating more ArrayList using ifs1 variable?