不带头节点的单链表及其基本操作（Java实现）

桃扇骨 2022-06-07 04:47 118阅读 0赞

package lwh.linearlist.linklist;
    
    public class Node {
    
        protected int e;
        protected Node next;
    
        public Node(){};
    
        public Node(int e){
            this.e = e;
        }
    
        public Node(int e, Node next){
            this.e = e;
            this.next = next;
        }
    }

package lwh.linearlist.linklist;
    
    import java.util.Scanner;
    
    //不带头节点的单链表
    public class LinkList {
    
        private Node head;
    
        public LinkList(){
            head = null;
        }
    
        //头插法建立单链表
        public void createListHead(){
            Scanner sc = new Scanner(System.in);
            while(sc.hasNext()){
                int num = sc.nextInt();
                if(num != 99){
                    Node node = new Node(num);
                    node.next = head;
                    head = node;
                }else{
                    break;
                }
            }
        }
    
        //递归删除不带头节点单链表中所有值为x的节点
        public void delete(int x){
            Node q = head;
            Node p = q;
            while(q != null && x != q.e){
                p = q;
                q = q.next;
            }
            if(q == head){
                head = q.next;
                q.next = null;
                q = null;
                delete(x);
            }else if(q != null){
                p.next = q.next;
                q.next = null;
                q = null;
                delete(x);
            }else{
                return;
            }
        }
    
        public void print() {
            if(head == null){
                System.out.println("No num");
                return;
            }
            System.out.print("[");
            for(Node node = head; node != null; node = node.next){
                if(node.next != null)
                    System.out.print(node.e + ",");
                else
                    System.out.print(node.e + "]");
            }
            System.out.println();
        }
    }