[LintCode] 489 Convert Array List to Linked List

Description
Convert an array list to a linked list.


Example 
Given [1,2,3,4], return 1->2->3->4->null.


Code

/**
 * Definition for ListNode.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int val) {
 *         this.val = val;
 *         this.next = null;
 *     }
 * }
 */ 
public class Solution {
    /**
     * @param nums an integer array list
     * @return the first node of linked list
     */
    public ListNode toLinkedList(ArrayList<Integer> nums) {  
        // Write your code here
        ListNode dummy = new ListNode(0);
        ListNode curr = dummy;
        for (int i = 0; i < nums.size(); i++) {
            curr.next = new ListNode(nums.get(i));
            curr = curr.next;
        }
        return dummy.next;
    }
}