Java tutorial bike example

[Riverpaw]

I tried to make the bike examples from the java tutorial work ( except for switching out a bike for a car), but whenever i try to compile, it says that there is no main method. From what I had gleaned from the tutorial, I didn't need one for a class that just sets values.
Also, is there a special way to put code in, or am i just supposed to copy-paste?



class Car {
// Problem with cmd prompt saying
//I'm not putting in a method body

int rpm = 0;
int speed = 0;
int gear;

// next three "voids" used to dertermine
// how to change the speed, gear, and rpm values.

void changeRpm (int newValue) {
rpm = newValue;
}

void changeSpeed (int newValue) {
speed = newValue;
}

void changeGear (int newValue) {
gear = newValue;
}

void printStates () {
System.out.println ("rpm:" + rpm+
"speed:" + speed +
"gear:" + gear);
}
}

class Testdrive {
public static void main(String[] args) {

//create car
Car car1 = new Car();
/*
* Invoking methods on this object
*/
car1.changeGear(4);
car1.changeSpeed(40);
car1.changeRpm(2100);
car1.printStates();
}
}

[Riverpaw]

Notepad is the ... IDE? that I am using.

[Riverpaw]

I wrote the notes to help my parents understand, not to be accurate