ArrayList example in java.

 

package Program;
import java.util.*;
 class Main
{
    public static void main(String[] args)
    {
        // Create an ArrayList with a capacity for 10 elements.
        ArrayList arrList = new ArrayList(10);
        // Add three elements to the ArrayList.
        arrList.add(new Integer(1));
        arrList.add(new Integer(2));
        arrList.add(new Integer(3));
        // Print the size of the ArrayList.
        int size = arrList.size();
        System.out.println("arrList contains " + size +
            " elements.");
        // Determine if the ArrayList contains an element.
        if (arrList.contains(new Integer(4)))
        {
            System.out.println("There is already an Integer with " +
                "the value 4 in the ArrayList.");
        }
        else
        {
            System.out.println("There is no Integer with " +
                "the value 4 in the ArrayList.");
        }
        // Change the value of the second element in the ArrayList.
        arrList.set(1, new Integer(4));
        // Print out the elements without using an iterator.
        for (int i = 0; i < arrList.size(); i++)
        {
            System.out.println(arrList.get(i));
        }
        // Remove the second element in the ArrayList.
        Object o = arrList.remove(1);
        System.out.println("Removed " + o.toString());
        // If the ArrayList is not empty, clear it out now.
        if (!arrList.isEmpty())
        {
            arrList.clear();
             System.out.println("clear");
        }
    }
}
Output:
arrList contains 3 elements.
There is no Integer with the value 4 in the ArrayList.
1
4
3
Removed 4
clear