尝试存储来自文本文件的值，但输出不正确 [英] Trying to store values from a a text file but it outputting incorrectly

问题描述

  try {
 File file = new File（dataCollection.txt）; 
扫描仪s =新扫描仪（文件）; （s.hasNext（））{
 String firstName = s.next（）; 
 
 while（s.hasNext（）） 
 String lastName = s.next（）; 
 String address = s.next（）; 
字符串suiteNumber = s.next（）; 
 String city = s.next（）; 
 String state = s.next（）; 
 String zipCode = s.next（）; 
 String balance = s.next（）; 
 System.out.println（First Name is+ firstName）; 
} 
 s.close（）; 
  

输入文件如下所示：

  FirstNameFXO | LastFXO | 2510大街|套房101D | City100 | GA | 72249 | $ 280.80 
名字PNN | LastPNR | 396大街|套房100A | City102 | GA | 24501 | $ 346.01 
 FirstNameXZU | LastXZU | 2585 Main Street | Suite 107C | City101 | GA | 21285 | $ 859.40 
  

我试图打印出firstName，所以我可以稍后使用它的各种其他用途，但它会输出这个（输出是更大，这只是前三行）：

 名字是FirstNameFXO | LastFXO | 2510 
名字是FirstNameXZU | LastXZU | 2585 
名字是FirstNameGHP | LastGHP | 2097 
  

解决方案

您正在使用的方法 .next（），它有默认的分隔符 whitespace ，所以它会读取并返回下一系列的字符串标记，直到到达空格。

在你的它将返回：

  firstname =FirstNameFXO | LastFXO | 2510; 
  

解决您的问题，您可以使用方法 .nextLine（） code



读取每一行，然后将其保存在变量 line 中并将其子字符串获取First Name ：



  while（s.hasNextLine（））{
 String line = s.nextLine（）; 
字符串firstname = line.substring（0，line.indexOf（|））; 
 System.out.println（First Name is+ firstName）; 
} 
  




Here is my program currently for retrieving data from the text file which looks like this:

try {
                File file = new File("dataCollection.txt");
                Scanner s = new Scanner(file);

                while(s.hasNext()){
                    String firstName = s.next();
                    String lastName = s.next();
                    String address = s.next();
                    String suiteNumber = s.next();
                    String city = s.next();
                    String state = s.next();
                    String zipCode = s.next();
                    String balance = s.next();
                    System.out.println("First Name is " + firstName);
                }
                s.close();

The input file looks like this:

FirstNameFXO|LastFXO|2510 Main Street|Suite 101D|City100|GA|72249|$280.80
FirstNamePNR|LastPNR|396 Main Street|Suite 100A|City102|GA|24501|$346.01
FirstNameXZU|LastXZU|2585 Main Street|Suite 107C|City101|GA|21285|$859.40

I am trying to print out just the firstName so I can use the values later for various other uses but it outputs this instead (the output is much larger, this is just the first three lines):

First Name is FirstNameFXO|LastFXO|2510
First Name is FirstNameXZU|LastXZU|2585
First Name is FirstNameGHP|LastGHP|2097

解决方案

the problem that you are using method .next() which has default delimiter whitespace so it will read and return the next series of string token until a whitespace is reached.

in your case it will return:

firstname ="FirstNameFXO|LastFXO|2510";

to solve your problem instead you can use method .nextLine()

read each line then save it in variable line and substring it to get the First Name:

 while(s.hasNextLine()){
    String line = s.nextLine();
    String firstname = line.substring(0,line.indexOf("|"));
    System.out.println("First Name is " + firstName);
 }

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