【數據結構】Java實現單鏈表

單鏈表的數據結構相對構建比較簡單

package DataStructure;

class Node{

    public int data;
    public Node next;

    Node(int data){
        this.data=data;
    }

    public void display(){
        System.out.print(" "+data);
    }

}

public class LinkList {

    Node head;
    int  length;

    public static void main(String[] args){

            LinkList linkList = new LinkList();
            linkList.addFirstNode(1);
            linkList.addFirstNode(12);
            linkList.addFirstNode(13);
            linkList.add(14,1);
            linkList.deleteIndex(2);
            System.out.println("鏈表長度爲："+linkList.ListLength());
            System.out.print("打印聊表內容：");
            linkList.displayAllNodes();

    }

    //新建一張鏈表
    public void LinkList(){
        head = null;
        length =0;
    }

    //插入頭結點
    public void addFirstNode(int data){
        Node node = new Node(data);
        node.next = head;
        head = node;
        length++;
    }

    public void add(int data, int n){
        Node node = new Node(data);
        Node p = head;
        Node q = head;
        int  i = 0;
        if(n>length||n<0){
            System.out.println("插入的位置有誤");
            return;
        }
        while(i!=n){
            q = p;
            p = p.next;
            i++;
        }
        node.next = p;
        q.next = node;
        length++;

    }

    public Node delete(int data){
        if(head==null){
            System.out.println("Linklist is null");
        }
        Node p = head;
        Node q = head;
        while(p.data!=data){
            if(q==null){
                System.out.println("該表中無此元素");
                return null;
            }
            q = p;
            p=p.next;
        }
        q.next = p.next;
        return p;
    }

    public Node deleteIndex(int index){
        if(head==null){
            System.out.println("Linklist is null");
        }
        Node p = head;
        Node q = head;
        int i=0;
        while(i!=index){
            q = p;
            p=p.next;
            i++;
        }
        q.next = p.next;
        return p;
    }

    public int ListLength(){
        return length;
    }

    public void displayAllNodes() {
        Node p = head;
        while (p != null) {
            p.display();
            p = p.next;
        }
        System.out.println();
    }
}

程序運行結果：