Array Lists

• The ArrayList class manages a sequence of objects
• Can grow and shrink as needed
• ArrayList class supplies methods for many common tasks, such as inserting and removing elements
• The ArrayList class is a generic class: ArrayList<T> collects objects of type T:
  

  ArrayList<BankAccount> accounts = new ArrayList<BankAccount>();
  accounts.add(new BankAccount(1001));
  accounts.add(new BankAccount(1015));
  accounts.add(new BankAccount(1022));

• size method yields number of elements