Example Program Continued

Example Program Continued

The names object of the example program can hold references to Strings. The picture shows the ArrayList after three elements have been added. The references are added in order starting with cell 0 of the array.

import java.util.* ;

class ArrayListEg
{

  public static void main ( String[] args)
  {
    // Create an ArrayList that holds references to Object
    ArrayList<Object> names = new ArrayList<Object>();

    // Add three Object references
    names.add("Amy");
    names.add("Bob");
    names.add("Cindy");
       
    // Access and print out the three Objects
    System.out.println("element 0: " + names.get(0) );
    System.out.println("element 1: " + names.get(1) );
    System.out.println("element 2: " + names.get(2) );
  }
}

Then the program accesses the references using the get() method and prints out the Strings. The output of the program is:

element 0: Amy
element 1: Bob
element 2: Cindy

The argument to the get() method acts like an index into an array.