在FileWriter上使用try catch

IOException 是一个超级类 FileNotFoundException . 因此,你的拦截 IO异常 还捕捉到每个 FileNotFoundException

您应该实现以下功能:

public static void writeAssignment(ArrayList<String> assignment, String filename) throws FileNotFoundException {

    try (FileWriter writer = new FileWriter(filename)) {
        for (String str : assignment) {
            writer.write(str + "\n");
        }
    } catch (FileNotFoundException e) {
        throw e; // catch and re-throw
    } catch (IOException e) {
        System.err.print("Something went wrong");
    }
}

您可以捕获异常而不是IOException

public static void writeAssignment(ArrayList<String> assignment, String filename) throws FileNotFoundException {

try {
    FileWriter writer = new FileWriter(filename);
    for (String str : assignment) {
        writer.write(str + "\n");
    }
    writer.close();

} catch (Exception e) {
    e.printStackTrace();
}
}

通过这种类型编码,您可以查看/学习异常的层次结构。 如果您想在是否捕获异常的情况下执行程序,可以使用 块在那里你将关闭你的作家。