使用掃描儀讀取Java中的文件

Question

我正在嘗試獲取一個程序來讀取文本文件，但是即使我在項目目錄中設置了potato.txt文件，它也會引發FileNotFoundException。

import java.io.File;
import java.util.Scanner;

public static void main(String[] args) {
    String potato = "potato.txt"; // assume this line can't be changed at all

    Scanner scan = new Scanner(new File(potato)); // throws FileNotFoundException

    while (scan.hasNextLine()) {
        String line = scan.nextLine();
        System.out.println(line);
    }


}

}

Answer 1

嘗試使用完整路徑，如下所示：

File file = new File("C:/temp/potato.txt"); //This is just an example path, look up your files path and put it here.
Scanner scan = new Scanner(file);

另外，別忘了在完成后關閉掃描儀（在while -loop之后）：

scan.close();