java - Java读取文件，输出第一个逗号分隔的字符串

Question

我想使用分隔符“,”提取文件中的第一个 String。为什么此代码生成的行数大于一行？

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(); }
    }
}

Answer 1

您正在循环内打印。这就是它多次打印的原因(如果这是您的要求)。

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

会做

编辑:正如 Abishek 还提到的，不要在 while 循环中再次read = in.readLine(); 因为这样做所以你跳过了一行。

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