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ListNode.java

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package reverseLinkedList;

public class ListNode {

public int val;

public ListNode next;

public ListNode(int x) {

val = x;

}

@Override

public String toString() {

return "ListNode [val=" + val + "]";

}

public ListNode(int val, ListNode next) {

super();

this.val = val;

this.next = next;

}

/**

* This is an assistant function, use it, we can easily see the structure of list

*/

public static String listToString(ListNode head) {

if (head == null) {

return "";

}

StringBuilder sb = new StringBuilder();

while (head.next != null) {

sb.append(head.val).append(",");

head = head.next;

}

sb.append(head.val);

return sb.toString();

}

/**

* This is an assistant function, use it, we can create a linkedList by array.

*/

public static ListNode arrayToList(int[] array) {

ListNode head = new ListNode(0);

ListNode p = head;

for (int i : array) {

p.next = new ListNode(i);

p = p.next;

}

return head.next;

}

}