java - 将链表复制到数组

Question

我如何像我的老师所说的那样“将链接列表复制到无序数组”？我不知道是否应该使用迭代器，但迭代器不只是将链表复制到另一个链表吗？欢迎任何帮助。

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Iterator;
import java.util.Scanner;
import jsjf.*;

public class Hw10 
{


public static void main(String[] args) throws FileNotFoundException
{   
    //-------------------------------------------------
    //Stack
    //-------------------------------------------------
    ArrayListStack <Names> transactions = new ArrayListStack<>();
    //-------------------------------------------------
    //Linked List
    //-------------------------------------------------
    LinkedUnorderedList<Names> list = new LinkedUnorderedList<>();
    //-------------------------------------------------
    // File Scanner
    //-------------------------------------------------
    Scanner fileScan = new Scanner(new File("input.txt"));
    //-------------------------------------------------
    //Variables that the scanner will read in
    //-------------------------------------------------
    int code;
    String name;
    int age;
    Names obj;
    //-------------------------------------------------
    //While Loop to read in file adding to the stack and linked list
    //-------------------------------------------------
    while(fileScan.hasNext())
    {
        code = fileScan.nextInt();
        if(code == 3)
        {
            name = fileScan.next();
            age = fileScan.nextInt();
            obj = new Names(name,age);
            transactions.push(obj);
        }
        else if (code == 1)
        {
            name = fileScan.next();
            age =fileScan.nextInt();
            obj = new Names(name,age);
            list.addToFront(obj);
        }    


    }
    /*
    System.out.print(list.toString());
    System.out.print("-------------");
    System.out.print(transactions.toString());
    */
    //-------------------------------------------------
    //iterator / copy / queue-- copy linked list into unordered array
    //-------------------------------------------------
    ArrayListQueue <Names> aq = new ArrayListQueue();


}

Answer 1

您只需一行代码即可完成此操作。

假设您有一个这样的列表:

List<Names> transactions;

要将其转换为数组，只需执行以下操作:

Names[] transactionsArray = transactions.toArray(new Names[transactions.size()]);

如果您需要随机化顺序，只需先调用Collections.shuffle()即可:

Collections.shuffle(transactions);