Practice Java Program - Reaction Timer #58

Build your own reaction timer to practice your java programming! ✅Hopefully, this practice java program has helped you learn some java!

This practice java program will print out a timer, have a user enter input and then print out the reaction time in milliseconds.

This practice java program can be tricky at first... But SURELY you'll get it :) If you followed along, congrats! You learned-by-doing!

I hope you enjoyed this java practice program! I like to have a nice mix of tutorials and practice java programs for you all :)

Was this practice java program helpful for you?

Disclosure: Springboard link provided is linked to my affiliate account & supports the channel.

Alex Lee

[husseinwahussein]

For anyone asking how to turn milliseconds into second, here is the solution.
If u divide reactionTime by 1000 the output should be in seconds.

/ 1000);

[AyshaFilms]

This was so easy and fun to make! After a month of watching and practicing java i came back to this video and understood everything that you were coding. Thank you Alex!

[mragunathan]

BRILLIANT! Here i was thinking it was going be so difficult to build a reaction timer for my game! thanks buddy, you just earned my sub!

[imperfectCraft]

the last piece to my first project, thank you!!! just coded my first timer and this was the only thing left i need, my while loop was running too fast and i needed this to slow down to 1 sec intervals.

[akramnadri]

One of the best tutorials on YouTube! Very easy to follow and informative, please make more of these bro!

[haihonglei]

Crystal clear and easy to understand! Thank you

[StinkiiChan]

I'd like to add a graphical interface to this game! Maybe a way to map to clicks on specific parts of the screen! Thanks for the lesson!

[Mike-mwfu]

You're amazing Please Keep Updating

[meat]

I know this is probably a stupid question but im just a kid

why did you subtract the stoptime by the start time
this is probably a dumb question but could somebody please help me out here

[randomguy]

scanner is to get input in the console only right ?

[shraddhakebhajans]

Can we have seconds in place of milliseconds i.e. in the output the reaction time is in a form of milliseconds, can we have the reaction time in seconds..??

[kelticguy]

Hi Alex This doesnt work for me the character from the keyboard appears in code window and so doesnt stop the program. I’m using IntelliJ

[fanpage]

It would be good to exclude ENTER for reaction time.

[RS-wqqs]

Hello
I made this program on notepad and it is giving me errors and error is in line"Thread.sleep(1000);
Can you help me plz.

[danielguzel]

hi i just started laerning this i wrote the same things you did in scrimba but i keept geting errors i tried with console.log but i couldnt do the dilay can u help me pls

[mattnsac]

Should use millis for everything instead of using sleep. Sleep is bad practice.

[lamellama]

*the two people who DISLIKED this are the noobs who make games on "ScRaTcH"*
Stupid dislikers never understand the importance of intelligence from youtube

Edit - and yea I myself am a bot cuz I code on *"BlUe J"* which is another Java platform but *WORSE*
U eclipse users will not understand how much us blue j users have to suffer by typing manually *every single command* (like import.java.util.*; or like System.out.println(); and not just right clicking to get the command typed for us :(