最近面試筆試白板寫程式碼，發現自己連連結串列都不會構建，放在這裡防止自己再忘記

public class ListNode<T> {
    T val;
    ListNode next;
    ListNode(T x){
        this.val=x;
    }
}

import java.util.ArrayList;
import java.util.List;

public class SingleList<T> {
    ListNode<T> head;
    SingleList(){
        this.head=new ListNode<T>(null);
    }

    //尾插法
    public ListNode createList(Integer[] element){
        if(element==null){
            return null;
        }
        ListNode<Integer> head=new ListNode<Integer>(0);
        ListNode p=head;
        for(int i=0;i<element.length;i++){
            ListNode<Integer> temp=new ListNode<Integer>((Integer)element[i]);
            p.next=temp;
            p=p.next;
        }
        return head;
    }
}
 

import javax.swing.*;
import java.util.List;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        Solution solution=new Solution();
        //呼叫方法
        Integer[] data={1,2,3,2,2,2,5,4,2};
        SingleList<Integer> list=new SingleList<Integer>();
        ListNode<Integer> head =list.createList(data);
        ListNode<Integer> p=head.next;
        while(p!=null){
            System.out.print(p.val+",");
            p=p.next;
        }
    }
}