What does the second brackets do?

Question

Java

How is it different ArrayList<E> name = new ArrayList();from ArrayList<E> name = new ArrayList<>();?

Answer 1

ArrayList<String> name = new ArrayList<>();- this is the same as your first line does not make sense, because you are not passing a generic type to the constructor. ArrayList<String> name = new ArrayList<String>();

Answer 2

First, if you do not need anything specific ArrayList<T>, then it is better to use type variables List<T>.
Second, try running this code:

ArrayList<String> name = new ArrayList(Arrays.asList(1,2,3));
 for (String s : name) {
      System.out.println(s);
}

And you will immediately understand why you need to specify triangular brackets.