面试题17：合并两个排序的链表

package offer;
public class  {
	static class ListNode{
		int data;
		ListNode  next;
	}
	 public ListNode  Merge(ListNode pHead1,ListNode pHead2){  
	        if(pHead1 == null)  
	            return pHead2;  
	        else if(pHead2 == null)  
	            return pHead1;  
	        ListNode pMergedHead = null;  
	        if(pHead1.data <pHead2.data){  
	            pMergedHead = pHead1;  
	            pMergedHead.next = Merge(pHead1.next ,pHead2);  
	        }else{  
	            pMergedHead = pHead2;  
	            pMergedHead.next = Merge(pHead1,pHead2.next);  
	        }  
	        return pMergedHead;  
	    }  
}