Java 读取文件以将其数据存储在数组中时出错
我正在写的程序是用Java编写的。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,我使用的是一个文本文件,它将在我的主程序中读取,一个名为People.java的服务类将用作我的程序的模板,我的主程序名为Names.java,它将读取文本文件并将其值存储到数组中 name.txt:Java 读取文件以将其数据存储在数组中时出错,java,arrays,file,stringtokenizer,Java,Arrays,File,Stringtokenizer,我正在写的程序是用Java编写的。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,我使用的是一个文本文件,它将在我的主程序中读取,一个名为People.java的服务类将用作我的程序的模板,我的主程序名为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 {
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]);
}
}
正如我在程序中所展示的,我试图打印peoplearray[0]的值,但当我这样做时,我的输出显示为:“null”
如果程序正常工作,peoplearray[0]的值应为“John Doe”,因为这些是“names.txt”中的适当值
peoplearray[0]的值是否应该为null?
如果没有,我可以如何解决此问题?
谢谢 您的论点顺序错误:
StringTokenizer token = new StringTokenizer("!", a);
据
公共StringTokenizer(字符串str,字符串delim)
使用
StringTokenizer token = new StringTokenizer(a,"!");