SCJP Exception Handling and Java I/O 2

Question 1

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

Accepted Answer

catch-finally (without try)

Answer

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

Question 2

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

Accepted Answer

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

Answer

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

Question 3

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

Accepted Answer

DataOutputStream

Answer

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

Question 4

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

Accepted Answer

To automatically close resources that implement AutoCloseable

Answer

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

Question 5

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

Accepted Answer

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

Answer

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

SCJP - Sun Certified Java Programmer Practice Test

SCJP - Sun Certified Java Programmer Practice Test

SCJP Exception Handling and Java I/O 2