Map<String, String> map = new HashMap<String, String>();
("ele1", "hello");
("ele2", "world");
("ele3", "java");
Set<String> set = ();
List<String> list1 = new ArrayList<String>(set);
for(int i = 0; i < (); i++){
("list1(" + i + ") --> " + (i));
}
List<String> list2 = new ArrayList<String> ();
(set);
for(String elem : list2){
(elem);
}