Static by default?

Question

Can any method or any variable be static by default?
Nowhere in my code I've used the word static, however I am getting an error that non-static variable cannot be referenced from a static context. Here is the part of the code where it gives me an error:
public class Customer {
    // constructor
    public Customer(double t, double servTime) {
         arrivalTime = t;
        serviceTime = servTime;
        if (BankSim.teller[0].waitline.length() <= BankSim.teller[1].waitline.length()) {
            System.out.println(BankSim.teller[1].waitline.length());
             BankSim.teller[0].enter(this);
        else {
                  BankSim.teller[1].enter(this);
}teller is a non-static variable and is the one that compiler complains about, neither are any other variables in all classes that are used by the program.

Answer 1

Depends on what you want to do with it.
There are 2 possibilities.
1. If you want teller to be the same for all accessing classes make it static.
2 If not make an instance of BankSim:
BankSim bankSim = new BankSim (...);
... // may be further code
bankSim.teller[0].length ();