Delay vs Thread.sleep in Kotlin - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to pause the coroutine without blocking the thread.

Kotlin

suspend fun pause() {
    [1](1000L)
}

Drag options to blanks, or click blank then click option'

AThread.sleep

Bdelay

Cwait

Dsleep

Attempts:

3 left

💡 Hint

Common Mistakes

Using Thread.sleep blocks the thread and is not recommended in coroutines.

The delay function pauses the coroutine without blocking the thread, unlike Thread.sleep.

2fill in blank

medium

Complete the code to block the current thread for 500 milliseconds.

Kotlin

fun blockThread() {
    [1](500)
}

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AThread.sleep

Bdelay

Cwait

Dpause

Attempts:

3 left

💡 Hint

Common Mistakes

Using delay in a non-suspending function causes errors.

Thread.sleep blocks the current thread for the specified time.

3fill in blank

hard

Fix the error in the coroutine by replacing the blocking call with a suspending function.

Kotlin

suspend fun waitOneSecond() {
    [1](1000L)
}

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Asleep

Bwait

Cdelay

DThread.sleep

Attempts:

3 left

💡 Hint

Common Mistakes

Using Thread.sleep inside suspend functions blocks the thread.

In coroutines, delay should be used instead of Thread.sleep to avoid blocking the thread.

4fill in blank

hard

Fill both blanks to create a coroutine that prints before and after a non-blocking delay.

Kotlin

suspend fun printWithDelay() {
    println("Start")
    [1](2000L)
    println([2])
}

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Adelay

B"End"

C"Done"

DThread.sleep

Attempts:

3 left

💡 Hint

Common Mistakes

Using Thread.sleep blocks the thread and delays printing.

Use delay to suspend without blocking, then print "End" after the delay.

5fill in blank

hard

Fill all three blanks to create a coroutine that delays, then blocks the thread, and finally prints a message.

Kotlin

suspend fun mixedWait() {
    [1](1000L)
    [2](500)
    println([3])
}

Drag options to blanks, or click blank then click option'

Adelay

BThread.sleep

C"Finished"

Dwait

Attempts:

3 left

💡 Hint

Common Mistakes

Using blocking calls before suspending functions can cause unexpected delays.

The coroutine first suspends with delay, then blocks the thread with Thread.sleep, and finally prints "Finished".