leetcode:Insertion Sort List

1、

　　Sort a linked list using insertion sort.

　　Given 1->3->2->0->null, return 0->1->2->3->null.

2、

　　

/**
 * Definition for ListNode.
 * public class ListNode {
 *     int val;
 *     ListNode next;
 *     ListNode(int val) {
 *         this.val = val;
 *         this.next = null;
 *     }
 * }
 */ 


public static ListNode insertionSortList(ListNode head) {
        // 1创建一个新的，用来接收
        ListNode dommy = new ListNode(0);
        while (head != null) {
            //地址赋予node,node即dommy
            ListNode node = dommy;
            //每次逐条进行判断，大的往前面挪，重新排序
            while (node.next != null && node.next.val < head.val) {
                node = node.next;
            }
            ListNode temp = head.next;
            head.next = node.next;
            node.next = head;
            head = temp;
        }
        return dommy.next;

    }