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Froggy Jumps

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This set of questions evaluates the fundamentals of concurrency in Java through the thread model. It is designed to check understanding from a conceptual level to practical implementation aspects.

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Brii Guerrero

Mexico

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Froggy Jumps ThreadsOnline version This set of questions evaluates the fundamentals of concurrency in Java through the thread model. It is designed to check understanding from a conceptual level to practical implementation aspects. by Brii Guerrero 1 What is a correct way to create a thread in Java? a Implement the Runnable interface and pass the instance to the Thread constructor. b Extend the Thread class and override the start() method. c Create a Thread instance and call the run() method directly without defining any task. 2 What does it mean for a thread to be in a WAITING state? a The thread is ready to run but is waiting for the scheduler to assign it the CPU. b The thread has finished its execution and cannot be run again. c The thread is waiting indefinitely for another thread to perform a specific action 3 Which of the following is a valid state in the life cycle of a thread in Java? a RUNNING b BLOCKED c PAUSED 4 What is ThreadLocal used for? a To share the same variable among all threads safely. b To store data that is exclusive to each thread, avoiding synchronization. c To define the local priority of a thread within its group. 5 What is the typical order of states that a thread goes through from its creation to its termination? a NEW → RUNNABLE → RUNNING → TERMINATED b NEW → RUNNABLE → BLOCKED/WAITING/TIMED_WAITING → RUNNABLE → TERMINATED c NEW → READY → RUNNING → SUSPENDED → TERMINATED 6 What exception can the Thread.sleep() method throw? a InterruptedException b IllegalMonitorStateException c ThreadExecutionException 7 What is the correct way to request the interruption of a thread in Java? a thread.stop() b thread.interrupt() c thread.suspend() 8 What does the get() method of Future do? a Returns the result immediately if it is available; otherwise, throws an exception. b Wait by blocking until the result is available or a wait interruption occurs. c Cancel the associated task and return the partial result. 9 What is the usefulness of ThreadGroup in Java? a It is the only way to create daemon threads. b Provides memory isolation between threads. c Group threads to handle them collectively (interrupt, set priorities, etc.). 10 What advantage does using a synchronized block have over a synchronized method? a It allows synchronizing only a critical part of the code, reducing contention. b It is faster in all cases. c It does not require specifying the locking object.

Froggy Jumps

ThreadsOnline version

This set of questions evaluates the fundamentals of concurrency in Java through the thread model. It is designed to check understanding from a conceptual level to practical implementation aspects.

by Brii Guerrero

What is a correct way to create a thread in Java?

Implement the Runnable interface and pass the instance to the Thread constructor.

Extend the Thread class and override the start() method.

Create a Thread instance and call the run() method directly without defining any task.

What does it mean for a thread to be in a WAITING state?

The thread is ready to run but is waiting for the scheduler to assign it the CPU.

The thread has finished its execution and cannot be run again.

The thread is waiting indefinitely for another thread to perform a specific action

Which of the following is a valid state in the life cycle of a thread in Java?

RUNNING

BLOCKED

PAUSED

What is ThreadLocal used for?

To share the same variable among all threads safely.

To store data that is exclusive to each thread, avoiding synchronization.

To define the local priority of a thread within its group.

What is the typical order of states that a thread goes through from its creation to its termination?

NEW → RUNNABLE → RUNNING → TERMINATED

NEW → RUNNABLE → BLOCKED/WAITING/TIMED_WAITING → RUNNABLE → TERMINATED

NEW → READY → RUNNING → SUSPENDED → TERMINATED

What exception can the Thread.sleep() method throw?

InterruptedException

IllegalMonitorStateException

ThreadExecutionException

What is the correct way to request the interruption of a thread in Java?

thread.stop()

thread.interrupt()

thread.suspend()

What does the get() method of Future do?

Returns the result immediately if it is available; otherwise, throws an exception.

Wait by blocking until the result is available or a wait interruption occurs.

Cancel the associated task and return the partial result.

What is the usefulness of ThreadGroup in Java?

It is the only way to create daemon threads.

Provides memory isolation between threads.

Group threads to handle them collectively (interrupt, set priorities, etc.).

What advantage does using a synchronized block have over a synchronized method?

It allows synchronizing only a critical part of the code, reducing contention.

It is faster in all cases.

It does not require specifying the locking object.

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Froggy Jumps

About this activity

Created by

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Froggy Jumps

ThreadsOnline version

by Brii Guerrero

What is a correct way to create a thread in Java?

What does it mean for a thread to be in a WAITING state?

Which of the following is a valid state in the life cycle of a thread in Java?

What is ThreadLocal used for?

What is the typical order of states that a thread goes through from its creation to its termination?

What exception can the Thread.sleep() method throw?

What is the correct way to request the interruption of a thread in Java?

What does the get() method of Future do?

What is the usefulness of ThreadGroup in Java?

What advantage does using a synchronized block have over a synchronized method?

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