在Java中读取文件，输出第一个以逗号分隔的字符串

问题描述

我想使用分隔符，提取文件中的第一个 String 。
为什么这段代码产生的行数大于1？

  public static void main（String [] args ）{
 BufferedReader in = null; 
尝试{
 in = new BufferedReader（new FileReader（irisAfter.txt））; 
 String read = null; （（read = in.readLine（））！= null）{
 read = in.readLine（）; 
 String [] splited = read.split（，）; 
 for（int i = 0; i< splited.length; i ++）{
 System.out.println（splited [0]）; 
 
 $ b catch（IOException e）{
 System.out.println（有问题：+ e）; 
 e.printStackTrace（）; 
} finally {
 try {
 in.close（）; 
} catch（Exception e）{e.printStackTrace（）; } 
} 
} 
  

解决方案

您正在循环内打印。这就是为什么它打印多次（如果这就是你要求）。

  String [] splited = read.split（ ）; 
 System.out.println（splited [0]）; 
  

只会做$ /

编辑：正如Abishek也提到的，不要在中读取= in.readLine（）; ，而 （）（）（read = in.readLine（））！= $（$）$（$）$（$） null）{
String [] splited = read.split（，）;
System.out.println（splited [0]）;
}

I want to extract the first String in a file using the delimiter ",".Why does this code generate a number of lines greater than one?

public static void main(String[] args) {
    BufferedReader in = null;
    try {
        in = new BufferedReader(new FileReader("irisAfter.txt"));
        String read = null;
        while ((read = in.readLine()) != null) {
            read = in.readLine();
            String[] splited = read.split(",");
            for (int i =0; i<splited.length;i++) {
                System.out.println(splited[0]);
            } 
        }
    } catch (IOException e) {
            System.out.println("There was a problem: " + e);
            e.printStackTrace();
    } finally {
        try {
            in.close();
        } catch (Exception e) { e.printStackTrace(); }
    }
}

解决方案

You are printing inside a loop. That's why it is printing multiple times (if that's what you're asking).

String[] splited = read.split(",");    
System.out.println(splited[0]);

will just do

EDIT: As Abishek also mentioned, don't read = in.readLine(); again inside your while loop since by doing so you are skipping a line.

while ((read = in.readLine()) != null) {
   String[] splited = read.split(",");
   System.out.println(splited[0]);
}

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