Hands-On Design Patterns with Java

The SystemAccelerator class

The SystemAccelerator class is presented here in two parts. The first part establishes the class variables, the constructor method, an accessor method that returns the speed, and an isEnabled() method that returns the value of the enabled variable:

public class SystemAccelerator {    // class variables    private WidgetProductionSystem mediator;    private boolean enabled;    private int speed;    // constructor    public SystemAccelerator(WidgetProductionSystem mediator) {        this.mediator = mediator;        enabled = false;        speed = 0;        mediator.mediateSystemAcceleration(this);    }    // accessor    public int getAcceleratorSpeed() {        return speed;    }    public boolean isEnabled() {        return enabled;    }

The second part of the SystemAccelerator class contains ...