Java使用 try-with-resources 实现自动关闭资源的方法

 BufferedReader br = null;
    String str;
    try {
      br = new BufferedReader(new FileReader(""));
      while ((str = br.readLine()) != null) {
        System.out.println(str);
      }
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      if (br != null) {
        try {
          br.close();
        } catch (IOException e) {
          e.printStackTrace();
        }
      }
    }

try (BufferedReader br = new BufferedReader(new FileReader(""))) {
      while ((str = br.readLine()) != null) {
        System.out.println(str);
      }
    } catch (IOException e) {
      e.printStackTrace();
    }

class TestAutoClosable implements AutoCloseable {

  @Override
  public void close() throws Exception {
    System.out.println("close");
  }

  public void test() {
    System.out.println("test");
  }
  
}

 try (BufferedReader br = new BufferedReader(new FileReader("E:/test.txt"));
       TestAutoClosable testAutoClosable = new TestAutoClosable()) {
      testAutoClosable.test();
    } catch (Exception e) {
      e.printStackTrace();
    }