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No, though there are several calculator tutorials on the Internet. If you've written the rest of the calculator or developed the code you have from other tutorials, this part is trivial, IF you...

calculator.subtractFromMemory( calculator.getUserInput() );

Of course I've made up names for variables and methods, but the gist of it is that the code in that action listener subtracts the user's...

Show us your code, and we'll help if we can. And why do you need help with the memory buttons. Memory is a variable. You add to the variable, subtract from the variable, get the value of the...