Hello;
In Oracle Docs - What is a Class, I copied/pasted Bicycle demo to test in class and got syntax error: "non static variable this cannot be referenced from a static context" Using BlueJ IDE. I removed static from main method and would compile, but then it is not running as written in Oracle Docs ???? here's my code:
public class BicycleDemo
{
class Bicycle
{
int cadence = 0;
int speed = 0;
int gear = 1;
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 printStates() {
System.out.println("cadence:" +
cadence + " speed:" +
speed + " gear:" + gear);
}
}
public static void main(String[] args)
{
System.out.println("This is the output of BicycleDemo");
// 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();
bike2.changeCadence(50);
bike2.speedUp(10);
bike2.changeGear(2);
bike2.changeCadence(40);
bike2.speedUp(10);
bike2.changeGear(3);
bike2.printStates();
}
}
Any and all suggestions are greatly appreciated....