How to Convert an ArrayList into an array : ArrayList « Collections Data Structure « Java

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Java » Collections Data Structure » ArrayList

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How to Convert an ArrayList into an array

     



import java.util.ArrayList;



public class Main {

  public static void main(String[] args) {

    ArrayList<Integer> al = new ArrayList<Integer>();

    al.add(new Integer(1));

    al.add(new Integer(2));

    al.add(new Integer(3));

    al.add(new Integer(4));

    al.add(new Integer(5));



    System.out.println("contents of al : " + al);

    Object ia[] = al.toArray(); // get array

    int sum = 0;



    for (int i = 0; i < ia.length; i++){

      sum += ((Integer) ia[i]).intValue();

    }

    System.out.println("Sum is :" + sum);

  }

}

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