Delay vs Thread.sleep in Kotlin - Quick Revision & Key Differences

Recall & Review

beginner

What does Thread.sleep() do in Kotlin?

Thread.sleep() pauses the current thread for a specified time, blocking it completely.

beginner

What is delay() in Kotlin coroutines?

delay() suspends the coroutine without blocking the thread, allowing other coroutines to run.

intermediate

How does delay() differ from Thread.sleep() in terms of thread usage?

Thread.sleep() blocks the thread, while delay() suspends only the coroutine, freeing the thread for other tasks.

beginner

When should you prefer delay() over Thread.sleep()?

Use delay() inside coroutines to keep your app responsive and efficient by not blocking threads.

intermediate

What happens if you use Thread.sleep() inside a coroutine?

The entire thread is blocked, which can freeze other coroutines and reduce performance.

What does delay() do in Kotlin coroutines?

A Starts a new thread

B Blocks the current thread

C Terminates the coroutine immediately

D Suspends the coroutine without blocking the thread

delay() suspends the coroutine but lets the thread run other tasks.

Which function blocks the thread in Kotlin?

A delay()

B async()

C Thread.sleep()

D launch()

Thread.sleep() blocks the thread, pausing all work on it.

Why is delay() preferred in coroutines?

A It suspends coroutine without blocking the thread

B It blocks the thread for better control

C It creates a new thread

D It terminates the coroutine

delay() suspends coroutine but keeps thread free for others.

What is the effect of Thread.sleep() inside a coroutine?

A Only the coroutine pauses

B The whole thread blocks, affecting other coroutines

C Coroutine runs faster

D Coroutine is cancelled

Thread.sleep() blocks the thread, freezing all coroutines on it.

Which is true about delay()?

A It suspends coroutine without blocking thread

B It is used only outside coroutines

C It is a blocking call

D It creates a new thread

delay() is a suspending function that does not block threads.

Explain the difference between delay() and Thread.sleep() in Kotlin.

Think about how each affects the thread and coroutine execution.

When should you use delay() instead of Thread.sleep() in Kotlin programming?

Consider the impact on app performance and responsiveness.