Exception Handling and Java I/O Flashcards

Which of the following is NOT a valid exception handling structure in Java?

Answer: catch-finally (without try)

A `catch` or `finally` block cannot exist without a preceding `try` block — Java requires `try` to begin an exception handling structure.

What is the difference between `Error` and `Exception` in Java?

Answer: Errors represent serious system-level problems not meant to be caught; Exceptions are application-level issues

`Error` (e.g., `OutOfMemoryError`) signals serious JVM-level problems that programs typically cannot recover from, while `Exception` covers application-level issues.

Which Java I/O class should be used to write primitive data types (int, double, boolean) to a stream?

Answer: DataOutputStream

`DataOutputStream` provides methods like `writeInt()`, `writeDouble()`, and `writeBoolean()` for writing primitive data types in a portable binary format.

What is the try-with-resources statement used for in Java 7+?

Answer: To automatically close resources that implement AutoCloseable

Try-with-resources automatically calls `close()` on any `AutoCloseable` resource declared in the try header when the block exits.

In Java, can a single `catch` block catch multiple exception types?

Answer: Yes, using a pipe (|) separator since Java 7 (multi-catch)

Java 7 introduced the multi-catch feature: `catch (IOException | SQLException e)` catches both exception types in one block.

Which stream class in Java allows reading and writing to the same file simultaneously?

Answer: RandomAccessFile

`RandomAccessFile` supports both reading and writing to a file and allows the file pointer to be moved to any position.