Java Interview Guide : 200+ Interview Questions and Answers - Thread states, priority, ExecutorService and Callable

The video tutorial explains the different states of a thread in Java, including new, runnable, running, blocked, and terminated states. It discusses how threads transition between these states and the role of thread priority in CPU allocation. The tutorial introduces the executor service, a modern way to manage thread execution, and highlights its features like future and callable, which allow for task completion checks and result returns.

Which state is a thread in when it is created but not yet started?

• Blocked

• Runnable

• Running

• New

What happens when two threads have the same priority?

• Both threads run simultaneously

• One thread is ignored

• The CPU allocates time equally between them

• The thread with the lower ID runs first

What is the default priority assigned to a Java thread?

• 5

• 1

• 10

• 0

What is the main purpose of an Executor Service?

• To increase thread priority

• To manage and execute tasks in the background

• To terminate threads

• To create new threads

Which method is used to check if a task executed by an Executor Service is complete?

• checkStatus()

• isComplete()

• get()

• isDone()

What is a key advantage of using Callable over Runnable?

• Callable can return a result

• Callable is faster

• Callable uses less memory

• Callable is easier to implement

Which method in the Callable interface is used to return a result?

• run()

• execute()

• call()

• start()