the highschool_student class, the variable group and the parent class variables name, age, classroom etc. will be allocated for each instance of a class. It is only because of this fact that we ...

If the variable is static, you can have tens of thousands of instances pointing at the same 32 bits. If the variable is not static, each instance gets its own copy, which for tens of thousands of ...

See the Java 101 Java interfaces tutorial for a more in-depth introduction to using interfaces in your Java programs, including where and where not to use default, static, and private methods.

There's no way to write some new code while running the app (not without using Edit and Continue or some other advanced techniques). The method I presented here might not work well in multithreaded ...