1Z0-819 Exception Handling & Concurrency

Question 1

What is the purpose of exception handling in Java?

Accepted Answer

To handle errors gracefully during runtime

Answer

To stop program execution immediately.

Answer

To increase code complexity.

Answer

To reduce performance.

Question 2

Which block must always follow a try block?

Accepted Answer

finally

Answer

do

Answer

loop

Answer

switch

Question 3

What is a checked exception in Java?

Accepted Answer

Exceptions that must be declared or handled

Answer

Exceptions ignored by the compiler.

Answer

Runtime exceptions only.

Answer

Errors that cause system crashes.

Question 4

Which class is the superclass of all exceptions?

Accepted Answer

Throwable

Answer

Exception

Answer

RuntimeException

Answer

Error

Question 5

How is a thread created in Java?

Accepted Answer

By extending Thread or implementing Runnable

Answer

By using the synchronized keyword.

Answer

By creating a new class with void main().

Answer

By calling static methods only.

Question 6

What does the 'synchronized' keyword ensure?

Accepted Answer

Mutual exclusion of threads in critical sections

Answer

All threads run faster.

Answer

Better exception handling.

Answer

Thread termination.

Question 7

Which method is used to start a thread?

Accepted Answer

start()

Answer

begin()

Answer

launch()

Answer

init()

Question 8

What happens if an exception is not caught?

Accepted Answer

The JVM handles it and may terminate the program

Answer

It is ignored.

Answer

The method is retried.

Answer

It is passed to another class automatically.

Question 9

What is the purpose of the ExecutorService in Java?

Accepted Answer

To manage and control multiple threads

Answer

To monitor memory usage.

Answer

To log system calls.

Answer

To increase CPU usage.