How to add timer?

in the act method of which class you want to put this in. i would also create a class for stoping it (a lose or win screen) and coins would be an instance variable that counts how many coins have been collected (lets say there is 100 in total there is probably other ways to do this as well,but this is how i would do it, i cant remember if there is a method to stop a scenario thats already running. if you would like to use it (if its even there) just replace the new Lose, or new Win with it.

I want to add timer in a top left screen and if the time is about 100 second the game will stop.I know how to stop the game and all but I just don't know how to display timer.Can you help?

you can either use the showText method in the act method or a separate one being called in the act method, or you can use custom font to display it. I am unable to help with creating the custom font due to I'm in the process of switching my code to custom font from the showText method, and my game is currently 10 times slower then it was before. I have my timer as a instance variable for respawning, and not a local variable. i am not sure know if changing it wont do anything or not. if you want to use the showText method replace the text, variable, x, and y, for the values you are using. call this method in the act method so it updates when the value is changed, and if you want it to display on world creation (not a second after), then add it to the constructor also.