Add to ArrayList

boolean add(E e)

Appends the specified element to the end of this list.

void add(int index, E element)

Inserts the specified element at the specified position in this list.

boolean addAll(Collection<? extends E> c)

Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's Iterator.

boolean addAll(int index, Collection<? extends E> c)

Inserts all of the elements in the specified collection into this list, starting at the specified position.

  import java.util.ArrayList;

public class Main {
  public static void main(String args[]) {
    ArrayList<String> al = new ArrayList<String>();

    al.add("C");
    al.add("A");
    al.add("E");
    al.add("java2s.com");
    al.add("D");
    al.add("F");
    al.add(1, "java2s.com");

    System.out.println(al);
  }
}
  

The output:

[C, java2s.com, A, E, java2s.com, D, F]

1. ArrayList Class
2. Create ArrayList object
3. Add to ArrayList
4. Clear an ArrayList
5. Shallow copy of current ArrayList
6. If contain a certain object
7. Increases the capacity of an ArrayList
8. Get/Replace element by index
9. Get object for index
10. Remove from ArrayList
11. Get the size and trim to size
12. If ArrayList is empty
13. Convert ArrayList to array