Java MCQs on Threads and Exceptions

What is the correct way to start a thread?

• run()

• start()

• execute()

• launch()

Which of the following is the correct signature of the run method?

• public void start()

• public void run()

• public int run()

• void run()

What is multithreading?

• Executing multiple programs

• Executing multiple classes

• Executing multiple threads concurrently

• Executing functions sequentially

Which interface should a class implement to become a thread?

• Runnable

• Threadable

• Thread

• Run

What will happen if we directly call the run() method instead of start()?

• Thread will start

• Compile error

• Runs as a normal method in main thread

• New thread created

Which block is always executed whether an exception is handled or not?

• catch

• throw

• try

• finally

What keyword is used to manually throw an exception?

• throws

• catch

• throw

• raise

What is the output of this code? try { int x = 5 / 0; } catch (ArithmeticException e) { System.out.println("Error"); } finally { System.out.println("Done"); }

• Compile error

• Error

• Error Done

• Done

Which class must be extended to create a custom checked exception?

• Throwable

• RuntimeException

• Error

• Exception

Which of the following is unchecked?

• IOException

• ArithmeticException

• SQLException

• FileNotFoundException