TestRobotBuilder.java

public class TestRobotBuilder {
    public static void main(String[] args) {
        // Get a RobotBuilder of type OldRobotBuilder
        RobotBuilder oldStyleRobot = new OldRobotBuilder();

        // Pass the OldRobotBuilder specification to the engineer
        RobotEngineer robotEngineer = new RobotEngineer(oldStyleRobot);

        // Tell the engineer to make the Robot using the specifications
        robotEngineer.makeRobot();

        // Get the Robot built based on the specifications
        Robot firstRobot = robotEngineer.getRobot();

        System.out.println("Robot Built:");
        System.out.println("Robot Head Type: " + firstRobot.getRobotHead());
        System.out.println("Robot Torso Type: " + firstRobot.getRobotTorso());
        System.out.println("Robot Arm Type: " + firstRobot.getRobotArms());
        System.out.println("Robot Leg Type: " + firstRobot.getRobotLegs());
    }
}