Hands-On Design Patterns with Java

WidgetProductionSystem

Our example WidgetProductionSystem class manages mediation between the other classes. The source code is presented in six sequential parts. The first part of the class defines the class variables and contains the constructor method:

public class WidgetProductionSystem {    // class variables    private Starter starter;    private AssemblySystem assemblySystem;    private SystemAccelerator systemAccelerator;    private EmergencyBreak emergencyBreak;    private Hopper hopper;    private int currentSpeed;    // constructor    public WidgetProductionSystem() {        currentSpeed = 0;    }

The second part of the WidgetProductionSystem class contains five mediation methods:

// mediation methodspublic void mediateStarter(Starter starter) {    this.starter = starter; ...