class Car {
String licensePlate = ""; // e.g. "New York 543 A23"
double speed = 0.0; // in kilometers per hour
double maxSpeed = 123.45; // in kilometers per hour
void floorIt() {
speed = maxSpeed;
}
}
Within the Car class, you don't absolutely need to
prefix the field names with this. like
this.licensePlate or this.speed. Just
licensePlate and speed are sufficient. The
this. may be implied. That's because the
floorIt() method must be called by a specific instance of
the Car class, and this instance knows what its data
is. Or, another way of looking at it, the every object has its own
floorIt() method.
For clarity, I will use an explicit this today, and
I recommend you do so too, at least initially. As you become more
comfortable with Java, classes, references, and OOP, you will be
able to leave out the this without fear of confusion.
Most real-world code does not use an explicit
this.