扫描仪使用循环从命令行读取文本文件，但循环不会中断

Question

所以我想从命令行使用 java 读取 .text 或 .data 文件

java name < filename.data

这是代码：

        ArrayList<String> input = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);

        while (scanner.hasNextLine()) {
             System.out.println("Reading line");
             String line = scanner.nextLine().trim();
             System.out.println("The line is: " + line);
             if (line.equals("") || line.isEmpty()) {
                 System.out.println("Found blank area");
                  break;
              }  
             System.out.println("Adding to arrayList");
             input.add(line);

        }
        System.out.println("Read in was successful");

“system.out.println("Read in was successfully"); 行从未到达过。似乎用于在读取后中断循环的“if”语句也从未到达过。循环似乎也没有返回到顶部。这是我的输出（该方法确实成功读取了我的所有文本文件）

Reading line
The line is: car
Adding to arrayList
Reading line
The line is: mega
Adding to arrayList
Reading line
The line is: bed
Adding to arrayList
Reading line
The line is: stop
Adding to arrayList
Reading line
The line is: game
Adding to arrayList
Reading line
The line is: pots
Adding to arrayList
Reading line
The line is: arc
Adding to arrayList

我希望再运行一次，通过打印出“找到的空白区域”来表明程序已到达文件末尾。

所以它似乎成功地读取了行，但似乎无法打破。 我的程序没有崩溃，它只是“挂”在那里，如果有任何意义的话。

Answer 1

它没有达到if (line.equals("") || line.isEmpty())代码，因为我认为空文件中没有空行，我尝试运行代码并获得所需的输出，输入文件内容为

输出

Reading line
The line is: car
Adding to arrayList
Reading line
The line is: mega
Adding to arrayList
Reading line
The line is: bed
Adding to arrayList
Reading line
The line is: stop
Adding to arrayList
Reading line
The line is: game
Adding to arrayList
Reading line
The line is: pots
Adding to arrayList
Reading line
The line is:
Found blank area
Read in was successful

输入文件

car
mega
bed
stop
game
pots

arc