Java链表分割_java中有没有写好的单链表

/* public class ListNode { int val; ListNode next = null; ListNode(int val) { this.val = val; } }*/
public class Partition { 
   
    public ListNode partition(ListNode pHead, int x) { 
   
        // write code here
        if(pHead == null || pHead.next == null){ 
   
            return pHead;
        }
        
        //newHead的指针
        ListNode newHead = new ListNode(-1);
        ListNode tmp = newHead;
        //pHead的指针
        ListNode preCur = pHead;
        ListNode cur = preCur.next;
        //把小于x的节点放进newHead链表里
        //其余结点不动
        while(cur != null){ 
   
            if(cur.val < x){ 
   
                preCur.next = cur.next;
                tmp.next = cur;
                tmp = tmp.next;
                cur = preCur.next;
            }else{ 
   
                preCur = preCur.next;
                cur = preCur.next;
            }
        }
        //判断头节点并拼接链表newHead -> pHead
        if(pHead.val < x){ 
   
            cur = pHead;
            pHead = pHead.next;
            cur.next = newHead.next;
            tmp.next = pHead;
            return cur;
        }else{ 
   
            tmp.next = pHead;
            return newHead.next;//删除pHead中的头节点
        }
    }
}