java - try catch 与 try-with-resources

Question

为什么在 readFile2() 中我需要捕获 FileNotFoundException 以及稍后由 close( ) 方法，并且在 try-with-resources(inside readfile1) Java 中没有要求我处理 FileNotFoundException，发生了什么？

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 的子类。通过捕获后者，你也捕获了前者。它与 try-catch 与 try-with-resources 无关。