I don't know if u r trying to achive something like this...
List lst = new ArrayList();
lst.add("item_1");
lst.add("item_2");
lst.add("item_3");
lst.add("item_4");
lst.add("item_5");
double group = Math.round(lst.size()/2.0);
int p=0;
for (; p < (group +2); ) {
String str = null;
str = (String)lst.get(p);
if ((p+1) < lst.size())
str = str + " "+ lst.get(p+1);
p = p+ 2;
System.out.println("str="+str);
}
-Naveen