How to increment an integer variable when a button is pressed for sometime?

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Java

Hi

I want to write a program which detects when a specific key(say Spacebar) is pressed and it increments an integer variable and displays the output as incrementing milliseconds starting from 0 and when i release the key it can decrement in the same rate to 0.

Even a suggestion on how to try this thing will be a help. I'll try on my own but currently i am unable to figure out this thing.

Thanks in advance !!

What I have tried:

I am currently working on core java libraries and trying to create simple programs. I am unable to do this using the class Scanner. I think it is not possible to do this using the Scanner class.