LuposX
commented
4 years ago Timer: https://www.techiedelight.com/measure-elapsed-time-execution-time-java/
Understanding threads: https://www.javaworld.com/article/2074217/java-101--understanding-java-threads--part-1--introducing-threads-and-runnables.html
Start a new thread for it:
thread = new Thread(new Timer(startTime)); //create a thread with input paramter the function that should get executed
thread.start(); // start thread
thread.stop(); // stop it
Lets you see how long much time you needed for finishing the level. Helpfull for speedrunners