Great work! You now have an understanding of what the
static keyword does. In fact, if you’ve made it this far in your Java lessons, you probably have a pretty good sense of what all the keywords and jargon are doing in
public static void main(String args). Take a moment to celebrate — that line of code can be incredibly intimidating for new learners and it’s a real accomplishment to learn about all of those different pieces.
To review, here are some of the main takeaways about static methods and variables:
- Static methods and variables are associated with the class as a whole, not objects of the class.
- Static methods and variables are declared as static by using the
statickeyword upon declaration.
- Static methods cannot interact with non-static instance variables. This is due to static methods not having a
- Both static methods and non-static methods can interact with static variables.
We’ve given you the complete code for your ATM class. Feel free to experiment with these static variables and methods. In particular, you might want to create a few more
ATMs in the
main() method and see how the static variables change. You could also consider writing a
depositMoney() method that works in the opposite way as