try catch vs try-with-resources

Question

为什么在readFile2()中我需要捕获FileNotFoundException，然后是close()方法抛出的IOException，而在try-with-resources(inside readfile1)中Java没有要求我处理FileNotFoundException，这是怎么回事？

public class TryWithResourcesTest {

    public static void main(String[] args) {

    }

    public static void readFile1() {
        try(Reader reader = new BufferedReader(new FileReader("text.txt"))) {
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void readFile2() {
        Reader reader = null;
        try {
            reader = new BufferedReader(new FileReader("text.txt"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } finally {
            try {
                if(reader != null)
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

Answer 1

FileNotFoundException是IOException的一个子类。通过捕捉后者，你也可以捕捉到前者。它与try-catch和try- with -resources没有任何关系。