单链表

public class LinkList {public Node head;public LinkList() {head = new Node();head.next = null;}//尾插法public void createByTail(int[] arr, int n) {Node tail = head;for(int i=0; i<n; i++) {Node c = new Node(arr[i]);tail.next = c;tail = c;}tail.next = null;}//头插法public void createByHead(int[] arr, int n) {head.next = null;for(int i=0; i<n; i++) {Node c = new Node(arr[i]);c.next = head.next;head.next = c;}}public void display() {Node p = head.next;while(p != null) {if(p.next != null)System.out.print(p.data + "->");else System.out.println(p.data);p = p.next;}}public boolean empty() {return head.next == null;}public int length() {Node p = head.next;int len = 0;while(p != null) {len++;p = p.next;}return len;}public int[] get(int i) {int[] arr = new int[2];int j = 0;Node p = head;while(j<i && p != null) {j++;p = p.next;}if(p == null) {arr[0] = 0;return arr;}arr[0] = 1;arr[1] = p.data;return arr;}public int locate(int e) {int j = 0;Node p = head.next;while(p != null) {j++;if(p.data == e) {break;}p = p.next;}if(p == null) {return 0;}return j;}public boolean insert(int i, int e) {int j = 0;Node p = head;while(j<i-1 && p!=null) {j++;p = p.next;}if(p == null) {return false;}Node n = new Node(e);n.next = p.next;p.next = n;return true;}public int[] delete(int i) {int[] arr = new int[2];int j = 0;Node p = head;while(j<i-1 && p!=null) {j++;p = p.next;}if(p == null) {arr[0] = 0;return arr;}Node q = p.next;if(q == null) {arr[0] = 0;return arr;}arr[0] = 1;arr[1] = q.data;p.next = p.next.next;return arr;}public static void main(String[] args) {int[] arr = new int[]{5,6,1,6,9,3,7,8};LinkList list = new LinkList();list.createByHead(arr, arr.length);list.display();list.createByTail(arr, arr.length);list.display();System.out.println(list.empty());System.out.println(list.length());if(list.get(9)[0] == 0) {System.out.println("error");} else {System.out.println(list.get(9)[1]);}if(list.get(8)[0] == 0) {System.out.println("error");} else {System.out.println(list.get(8)[1]);}System.out.println(list.locate(9));System.out.println(list.locate(4));if(!list.insert(10, 10)) {System.out.println("error");} else {list.display();}if(!list.insert(8, 10)) {System.out.println("error");} else {list.display();}int[] tmp = list.delete(10);if(tmp[0] == 0) {System.out.println("error");} else {System.out.println("delete " + tmp[1]);list.display();}tmp = list.delete(4);if(tmp[0] == 0) {System.out.println("error");} else {System.out.println("delete " + tmp[1]);list.display();}}}class Node {public int data;public Node next;public Node(){}public Node(int data) {this.data = data;}}

结果：

8->7->3->9->6->1->6->55->6->1->6->9->3->7->8false8error850error5->6->1->6->9->3->7->10->8errordelete 65->6->1->9->3->7->10->8

ps：插入或者删除一个节点一定要先找到插入该节点的或者被删节点的前驱节点！！