Exam 1z0-819 topic 1 question 156 discussion

In both cases reader1 is effectively final : BufferedReader reader1 = new BufferedReader(new FileReader("journaldev.txt")); try (reader1) { System.out.println(reader1.readLine()); //reader1 = Error effectively final } catch (IOException e) { System.out.println(reader1); } } or try (BufferedReader reader1 = new BufferedReader(new FileReader("journaldev.txt"));) { System.out.println(reader1.readLine()); //reader1 = Error effectively final } catch (IOException e) { }

Variables in try with resource are implicit final, so if you try to asing a new value in try block no compile time error.

Tested: A. auto-closeable resource reader may not be assigned reader = new BufferedReader (new FileReader(file2)); ^ 1 error error: compilation failed

A is correct Exception in thread "main" java.lang.Error: Unresolved compilation problem: The resource reader of a try-with-resources statement cannot be assigned