public class Robot implements Controllable {
    private int      	batteryLevel;
    private Behavior[]	behaviors;

    // These are the Controllable-related methods
    public void turnLeft() { /* ...*/ }
    public void turnRight() { /* ...*/ }
    public void moveForward() { /* ...*/ }
    public void moveBackward() { /* ...*/ }

    // There will likely also be some other methods
    // which are robot-specific
    public Behavior computeDesiredBehavior() { /* ...*/ }
    public int readSensor(Sensor x) { /* ...*/ }
    //...
}