jshell> ArrayList<String> foo = new ArrayList<>();
foo ==> []

jshell> foo.add("cat");
$2 ==> true

jshell> foo.add("dawg");
$3 ==> true

jshell> foo.add("elephant");
$4 ==> true

jshell> for(String item: foo){System.out.println(item);}
cat
dawg
elephant

jshell>