读取文件以将其数据存储在数组中时出错

Question

我正在写的程序在Java。我试图让我的程序读取文件 "name.txt" 并将文本文件的值存储在数组中。

到目前为止，我正在使用一个将在我的主程序中读取的文本文件，一个名为 People.java 的服务 class，它将用作我的程序的模板，以及我的主程序称为 Names.java，它将读取文本文件并将其值存储到数组中。

name.txt:

John!Doe
Jane!Doe
Mike!Smith
John!Smith
George!Smith

People.java:

public class People
{
    String firstname = " ";
    String lastname = " ";

    public People()
    {
        firstname = "First Name";
        lastname = "Last Name";
    }

    public People(String firnam, String lasnam)
    {
        firstname = firnam;
        lastname = lasnam;
    }

    public String toString()
    {
        String str = firstname+" "+lastname;

        return str;
    }

}

Names.java:

import java.io.File;
import java.io.IOException;
import java.util.Scanner;
import java.util.StringTokenizer;
public class Names
{
    public static void main(String[]args)
    {
        String a = " ";
        String b = "empty";
        String c = "empty";
        int counter = 0;


        People[]peoplearray=new People[5];

        try
        {
            File names = new File("name.txt");
            Scanner read = new Scanner(names);

            while(read.hasNext())
            {
                a = read.next();
                StringTokenizer token = new StringTokenizer("!", a);

                while(token.hasMoreTokens())
                {
                b = token.nextToken();
                c = token.nextToken();
                People p = new People(b,c);
                peoplearray[counter]=p;
                ++counter;
                }
            }
        }

        catch(IOException ioe1)
        {
            System.out.println("There was a problem reading the file.");
        }

        System.out.println(peoplearray[0]);

    }
}

如我在我的程序中所示，我尝试打印 peoplearray[0] 的值，但是当我这样做时，我的输出显示为："null."

如果程序运行正常，peoplearray[0] 的值应该是 "John Doe" 因为这些是 "names.txt"

中的适当值

peoplearray[0] 的值应该为空吗？如果没有，我该怎么做才能解决这个问题？谢谢！

Answer 1

你的参数顺序错误：

StringTokenizer token = new StringTokenizer("!", a);

根据API constructor

public StringTokenizer(String str, String delim)

使用

StringTokenizer token = new StringTokenizer(a,"!");

读取文件以将其数据存储在数组中时出错

Error Reading Files to Store their Data in an Array

java

arrays

file

stringtokenizer