I/O Operations Flashcards
7 cards from real 1Z0-819 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 I/O Operations flashcards as text
Which method in the `Files` class copies a file and replaces the destination if it already exists?
Answer: Files.copy(src, dst, StandardCopyOption.REPLACE_EXISTING)
`Files.copy` with `StandardCopyOption.REPLACE_EXISTING` overwrites the destination file if it exists.
What does `Files.walk(path)` return?
Answer: A `Stream` of all files in the directory tree
`Files.walk` returns a lazy `Stream` that traverses the directory tree depth-first.
Which `OpenOption` must be specified to append to an existing file using `Files.newOutputStream`?
Answer: StandardOpenOption.APPEND
`StandardOpenOption.APPEND` positions the stream at the end of the file before each write.
What exception is thrown when you call `Files.readAllBytes` on a path that does not exist?
Answer: NoSuchFileException
`Files.readAllBytes` throws `NoSuchFileException` (a subclass of `IOException`) when the file is absent.
What is the result of `Path.relativize(other)` when `other` is not relative to the base path?
Answer: It may include `..` segments to navigate up the tree
`relativize` uses `..` components to express a path from base to target even when traversal above base is needed.
Which class provides buffered character-based reading with a `readLine()` method?
Answer: BufferedReader
`BufferedReader` wraps a `Reader` and offers the `readLine()` convenience method.
When using `try-with-resources` with multiple `AutoCloseable` resources, in what order are they closed?
Answer: Reverse order of declaration
Resources are closed in the reverse order they are declared, ensuring proper cleanup of dependent resources.