Convert an ArrayList into an array. : ArrayList « Collections Data Structure « Java

1. Java
2. Collections Data Structure
3. ArrayList

Convert an ArrayList into an array.

      
import java.util.ArrayList;

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

    al.add(1);
    al.add(2);
    al.add(3);
    al.add(4);

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

    Integer ia[] = new Integer[al.size()];
    ia = al.toArray(ia);

    int sum = 0;

    for (int i : ia)
      sum += i;

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

   
    
    
    
    
  

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