java - 当找到文件但不包含任何内容时抛出哪个异常？

Question

如果文件为空，应该抛出哪种异常？

例如，

List<Cars> cars = new LinkedList<Cars>(); 

Scanner inFile = new Scanner(new FileReader(文件名));

    if(!inFile.hasNextLine()) {
        throw new ???????????????????
    } 

    while(inFile.hasNextLine()) {
        String line = inFile.nextLine(); 

        String[] CarInfo = line.split("\\|"); 

        Car tmpCar = new Car(CarInfo[0],CarInfo[1],CarInfo[2]);

        cars.add(tmpCar);

    } 
    inFile.close(); 

谢谢

Answer 1

您可以使用自己的消息创建自己的自定义异常类，如下所示:

public class EmptyFileException extends Exception {

    private String message = "The file is empty!";

    public EmptyFileException() {
        super(message);
    }

}

然后在代码中您可以抛出新的异常:

Scanner inFile = new Scanner(new FileReader(filename)); 

if(!inFile.hasNextLine()) {
    throw new EmptyFileException();
}
// ...

B.