// Project: Patterns2
// Module: state
// Source code file: State.java
// Use the State pattern to implement
// the states of a gumball machine.
// This interface is implemented by these classes:
// NoQuarter, HasQuarter, Sold, SoldOut.

package gumball;
public interface State {

    public void insertQuarter( );
    public void turnCrank( );
    public void takeGumball( );
    public void refillMachine(int n);
}