Module 8 Lab - Traffic Mode (State Pattern)

Code Starter

TrafficState.java

// Defines the interface for various traffic states. Each state must implement methods to calculate ETA and provide directions.
public interface TrafficState {
    int getETA(int distance);
    String getDirection(int distance);
}

DirectionService.java

public class DirectionService {
    private TrafficState currentState; // Current state of the traffic.
    private int distance; // Current distance for the trip.

    // Constructor to initialize the service with a specific traffic state and distance.
    public DirectionService(TrafficState state, int distance) {
        this.currentState = state;
        this.distance = distance;
    }

    // Sets the current traffic state, allowing the behavior of getETA and getDirection to change dynamically.
    public void setTrafficState(TrafficState state) {
        this.currentState = state;
    }

    // Returns the current traffic state, allowing external classes to get information about the current state.
    public TrafficState getCurrentState() {
        return currentState;
    }

    // Delegates the calculation of ETA to the current state.
    public int getETA() {
        return currentState.getETA(distance);
    }

    // Delegates the provision of directions to the current state.
    public String getDirection() {
        return currentState.getDirection(distance);
    }

    // Optionally, a method to update the distance if needed.
    public void setDistance(int distance) {
        this.distance = distance;
    }
}

NoTraffic.java

public class NoTraffic implements TrafficState {
    @Override
    public int getETA(int distance) {
        // In no traffic, every mile might take approximately 1 minute to cover.
        return distance; // Since 1 mile per minute, the ETA is equal to the distance.
    }

    @Override
    public String getDirection(int distance) {
        // Provides a generic direction for traveling without any traffic delays.
        return "Proceed straight to your destination, roads are clear.";
    }
}

LowTrafiic.java

MediumTraffic.java

HighTraffic.java

Driver.java

Instructions

implement the code for the HighTraffic and MediumTraffic classes.

MediumTraffic Class:

HighTraffic Class

Driver:

Output Example:

Deliverables

Upload the following files in a zip folder that you have created:

Java class files
Screenshot of the Console with the code execution