通过逗号将文件输入拆分到数组Java中，并重写到该文件中

Question

假设我有一个文件text.txt，在单行中包含以下内容：

abc, def, ghi, jkl

String[] tokens;
try {
        Scanner scanner = new Scanner("text.txt");
        while (scanner.hasNext()) { tokens = scanner.nextLine().split(","); }
} catch (IOException e) {
        e.printStackTrace();
}
System.out.println(tokens.length); // Prints 1 instead of 4

Answer 1

您正在为每一行覆盖标记（我想您有一个空行）

试试看

String[] tokens;
try {
    scanner = new Scanner(new File ("text.txt"));
    while (scanner.hasNextLine())       // change this
    { 
         tokens = scanner.nextLine().split(","); 
         System.out.println(tokens.length); 
     }
} catch (IOException e) {
    e.printStackTrace();
}