Thread: how/where to add new method and attributes

hi

new-noob here looking for some1 to explain these to me:

having code (found in one tutorials) and it works all-right want to add some new methods and attributes but need you to point me into right direction, please.

public class Bicycle {
    int cadence = 0;
    int speed = 0;
    int gear = 1;
    int sits = 0;
    void changeCadence(int newValue) {
         cadence = newValue;
    }
    void changeGear(int newValue) {
         gear = newValue;
    }
    void speedUp(int increment) {
         speed = speed + increment;   
    }
    void applyBrakes(int decrement) {
         speed = speed - decrement;
    }
    void sitsNumber(int newValue){
    	sits = newValue;
    }
    void printStates() {
         System.out.println("cadence:" +
             cadence + " speed:" + 
             speed + " gear:" + gear + " sits: " + sits );
    }
}
 
class BicycleDemo {
    public static void main(String[] args) {
 
        // Create two different 
        // Bicycle objects
        Bicycle bike1 = new Bicycle();
        Bicycle bike2 = new Bicycle();
 
        // Invoke methods on 
        // those objects
        bike1.changeCadence(50);
        bike1.speedUp(10);
        bike1.changeGear(2);
        bike1.printStates();
        bike1.sitsNumber(1);
 
        bike2.changeCadence(50);
        bike2.speedUp(10);
        bike2.changeGear(2);
        bike2.changeCadence(40);
        bike2.speedUp(10);
        bike2.changeGear(3);
        bike2.printStates();
        bike2.sitsNumber(2);
 
    }
}