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premaseempremaseem
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Mediator design pattern - Traffic Light Project - Bonus Example
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5 files changed

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‎pattern/src/com/premaseem/Client.java

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‎patternBonus/src/com/premaseem/Client.java

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‎patternBonus/src/com/premaseem/lightSignal/Client.java

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package com.premaseem.lightSignal;
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import java.util.Scanner;
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public class Client {
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public static void main(String[] args) {
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System.out.println("Welcome to Traffic light signal program which uses Mediator ");
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System.out.println(" Out of 3 button only 1 could be ON and others has to in OFF state ");
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Scanner scan = new Scanner(System.in);
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// Object initialization block
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LightMediator LightMediator = new LightMediator();
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Light red = new RedLight(LightMediator);
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Light yellow = new YellowLight(LightMediator);
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Light green = new GreenLight(LightMediator);
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// User input block
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String repeatRunFlag = "yes";
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while (!repeatRunFlag.equalsIgnoreCase("no")) {
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System.out.println("Which light you want to turn on ? ");
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System.out.println("press 1 for RED");
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System.out.println("press 2 for YELLOW ");
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System.out.println("press 2 for GREEN ");
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int choice = scan.nextInt();
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if (choice == 1) {
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red.turnON();
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} else if(choice == 2) {
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yellow.turnON();
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} else{
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green.turnON();
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}
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System.out.println("\n=============================");
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System.out.println("Press No to Exit and any other character to repeat .... ");
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try {
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repeatRunFlag = scan.next();
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} catch (Exception e) {
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repeatRunFlag = "no";
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}
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}
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System.out.println("\n $$$$$$$$$$$$$$$$$$$$ Thanks by Prem Aseem $$$$$$$$$$$$$$$$$$$$$$ \n ");
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System.out.println("\n $$$$$$$$$$$$$$$$$$$$$ www.premaseem.me $$$$$$$$$$$$$$$$$$$$$$ \n ");
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}
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}
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‎patternBonus/src/com/premaseem/lightSignal/Light.java

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package com.premaseem.lightSignal;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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public abstract class Light {
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Light(LightMediator LightMediator){
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this.LightMediator = LightMediator;
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LightMediator.registerLight(this);
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}
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enum state {
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ON, OFF
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}
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state currentState;
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LightMediator LightMediator;
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int id;
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void turnON() {
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currentState = state.ON;
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System.out.printf("%s is turned %s \n", this.getClass().getSimpleName(), currentState.ON);
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LightMediator.turnON(this);
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}
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void turnOFF() {
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currentState = state.OFF;
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System.out.printf("%s is turned %s \n", this.getClass().getSimpleName(), currentState.OFF);
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}
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public void addId(int index) {
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id = index;
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}
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}
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class RedLight extends Light {
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public RedLight(LightMediator LightMediator) {
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super(LightMediator);
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}
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}
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class YellowLight extends Light {
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public YellowLight(LightMediator LightMediator) {
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super(LightMediator);
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}
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}
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class GreenLight extends Light {
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public GreenLight(LightMediator LightMediator) {
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super(LightMediator);
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}
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}

‎patternBonus/src/com/premaseem/lightSignal/LightMediator.java

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package com.premaseem.lightSignal;
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/*
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@author: Aseem Jain
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@title: Design Patterns with Java 9
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@link: https://premaseem.wordpress.com/category/computers/design-patterns/
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*/
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import java.util.ArrayList;
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import java.util.List;
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public class LightMediator {
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List<Light> list = new ArrayList<Light>();
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public void registerLight(Light lite) {
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int index = list.size();
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lite.addId(index);
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list.add(index, lite);
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}
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void turnOffAllOtherLights(int ind){
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for (Light litt : list){
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if(!(litt.id==ind)){
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litt.turnOFF();
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}
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}
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}
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public void turnON(Light light) {
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turnOffAllOtherLights(light.id);
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}
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}

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