java - Creating a new collection from an existing collection -

i have collection of objects follows:

collection<foo> 

where foo is

public class foo {      private user user;     private item item;      public foo(user user, item item) {         this.user = user;         this.item = item;     }      public user getuser() {         return user;     }      public void setuser(user user) {         this.user = user;     }      public item getitem() {         return item;     }      public void setitem(item item) {         this.item = item;     }  } 

i want return collection of type collection<item> using collection<foo>. using for loop , looping through collection, getting item, , adding new list. far have used google guava create collection<foo> using predicate.

is there method/function in google guava allow me create collection<item> collection<foo>? should use transform function?

if can use java 8:

collection<item> items = foos.stream()             .map(foo::getitem)             .collect(tolist()); 

otherwise can indeed use transform method. in case:

function<foo, item> f =      new function<foo, item>() {          public item apply(foo foo) { return foo.getitem(); }     };  collection<item> items = collections2.transform(foos, f);