How many lines of the following code does not compile? If remove them, what is the output?
4 ArrayList<String> l = new ArrayList<>();
5 l.add("1").add("5").add(1,"3");
6 l.add("1");
7 l.add("5");
8 l.add(1,"3");
9 l.add(6);
10 System.out.println(l);
Line 5 doesn't compile, the add method returns a boolean, it can not be chained. Line 6 doesn't compile, the generic type is String, can not cast int to String. If line 5 and 9 is removed, the output is [1, 3, 5]
