Introduction

This repository contains a simple traffic signal simulation using Java.

Class Diagram

Application Execution Steps

Pre-requisites

• Java Runtime Environment - JRE

Running the application

• Clone this repo
• Using the terminal navigate to the cloned directory and execute pwd command to verify.

$ pwd
<your-desired-path>/traffic-light-simulator

• Run the application as below

$ cd src
$ javac TrafficSignalApplication.java
$ java TrafficSignalApplication

• Sample output

=================
Initial state
NorthSouthTrafficLight ==> GreenState
NorthWestSouthEastTrafficLight ==> GreenState
EastWestTrafficLight ==> RedState
EastNorthWestSouthTrafficLight ==> RedState
=================


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57 second(s)
NorthSouthTrafficLight ==> YellowState
58 second(s)
59 second(s)
60 second(s)
NorthSouthTrafficLight ==> RedState
61 second(s)
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64 second(s)
65 second(s)
66 second(s)
67 second(s)
NorthWestSouthEastTrafficLight ==> YellowState
68 second(s)
69 second(s)
70 second(s)
EastWestTrafficLight ==> GreenState
EastNorthWestSouthTrafficLight ==> GreenState
NorthWestSouthEastTrafficLight ==> RedState
Completed 1 cycle!
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EastWestTrafficLight ==> YellowState
58 second(s)
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60 second(s)
EastWestTrafficLight ==> RedState
61 second(s)
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67 second(s)
EastNorthWestSouthTrafficLight ==> YellowState
68 second(s)
69 second(s)
70 second(s)
NorthSouthTrafficLight ==> GreenState
EastNorthWestSouthTrafficLight ==> RedState
NorthWestSouthEastTrafficLight ==> GreenState
Completed 2 cycle!
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NorthSouthTrafficLight ==> YellowState
58 second(s)
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60 second(s)
NorthSouthTrafficLight ==> RedState
61 second(s)
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67 second(s)
NorthWestSouthEastTrafficLight ==> YellowState
68 second(s)
69 second(s)
70 second(s)
EastWestTrafficLight ==> GreenState
EastNorthWestSouthTrafficLight ==> GreenState
NorthWestSouthEastTrafficLight ==> RedState
Completed 3 cycle!

=================
Stopping Simulation after 3 cycle(s)!
=================

App Configurations

• ApplicationConstants file has the necessary configuration which can be modified as per our need.

    public static final int END_AFTER_CYCLE = 3;
    public static final int YELLOW_DURATION = 3;
    public static final int GREEN_DURATION = 57;
    public static final int TURN_RIGHT_GREEN_DURATION = GREEN_DURATION + 10;

• Currently the simulation will be terminated after 3 cycles.(i.e. after 210 seconds)