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premaseempremaseem
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Fly Wheel Patterns - Example of Star tracker where same objects are reused by changing extensric properties
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‎FlyWeightPatternStarTrakerExample/.gitignore‎

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/bin

‎FlyWeightPatternStarTrakerExample/src/com/premaseem/flyWeight/ClientFile.java‎

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package com.premaseem.flyWeight;
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import java.util.Scanner;
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public class ClientFile {
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public static void main(String[] args) {
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System.out.println("Welcome to the star tracker example using Fly Weight pattern ");
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Scanner scan = new Scanner(System.in);
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StarFactory starFactory = new StarFactory();
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Star star = null;
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int repeatRunFlag = 1;
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while (repeatRunFlag == 1) {
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System.out.println(" Which star you want to draw ");
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System.out.println("press 1 for PoleStar");
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System.out.println("press 2 for DraughStar ");
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System.out.println("press 3 for SuperNoveStar ");
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int tvType = scan.nextInt();
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System.out.println(" Enter placement of Center of star in number ");
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String center = scan.next();
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if (tvType == 1) {
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star = starFactory.getStar("PoleStar");
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} else if (tvType == 2) {
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star = starFactory.getStar("DraughStar");
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} else {
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star = starFactory.getStar("SuperNoveStar");
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}
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star.setCenter(center);
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System.out.println("=============================");
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System.out.println(star);
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System.out.println("=============================");
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System.out.println("Press 1 to Repeat .... ");
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try {
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repeatRunFlag = scan.nextInt();
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} catch (Exception e) {
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repeatRunFlag = 0;
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}
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}
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System.out.println("\n $$$$$$$$$$$$$$$$$$$$ Thanks by Prem Aseem $$$$$$$$$$$$$$$$$$$$$$ \n ");
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System.out.println("\n $$$$$$$$$$$$$$$$$$$$$ www.premaseem.com $$$$$$$$$$$$$$$$$$$$$$ \n ");
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}
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}

‎FlyWeightPatternStarTrakerExample/src/com/premaseem/flyWeight/Star.java‎

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package com.premaseem.flyWeight;
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abstract public class Star {
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public Star(String name){
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this.name = name;
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}
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String extensricInputcenter;
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/**
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*
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*/
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String name;
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String getCenter() {
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return extensricInputcenter;
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}
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void setCenter(String center) {
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this.extensricInputcenter = center;
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}
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String getName() {
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return name;
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}
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void setName(String name) {
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this.name = name;
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}
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String starColor = "white";
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String size = "big";
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String getStarColor() {
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return starColor;
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}
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abstract void setStarColor(String starColor);
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String getSize() {
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return size;
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}
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abstract void setSize(String size);
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@Override
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public String toString() {
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return this.getClass().getSimpleName() + " placed at " + extensricInputcenter +" with color "+ starColor + " and size " + size ;
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}
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}
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class SuperNoveStar extends Star {
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public SuperNoveStar(String name) {
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super(name);
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// TODO Auto-generated constructor stub
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}
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@Override
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void setStarColor(String starColor) {
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this.starColor = "red";
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}
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@Override
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void setSize(String size) {
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this.size = "huge";
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}
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}
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class PoleStar extends Star {
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public PoleStar(String name) {
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super(name);
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// TODO Auto-generated constructor stub
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}
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@Override
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void setStarColor(String starColor) {
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// TODO Auto-generated method stub
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this.starColor = "while";
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}
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@Override
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void setSize(String size) {
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// TODO Auto-generated method stub
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this.size = "medium";
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}
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}
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class DraughStar extends Star {
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public DraughStar(String name) {
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super(name);
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// TODO Auto-generated constructor stub
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}
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@Override
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void setStarColor(String starColor) {
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this.starColor = "black";
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}
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@Override
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void setSize(String size) {
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this.size = "small";
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}
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}

‎FlyWeightPatternStarTrakerExample/src/com/premaseem/flyWeight/StarFactory.java‎

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package com.premaseem.flyWeight;
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import java.util.HashMap;
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import java.util.Map;
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public class StarFactory {
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Map<String, Star> starStock = new HashMap<String, Star>();
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Star getStar(String name) {
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return (starStock.get(name) == null ? getNewStar(name) : starStock.get(name));
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}
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Star getNewStar(String name) {
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Star star = null;
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if(name.equalsIgnoreCase("SuperNoveStar")){
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star = new SuperNoveStar(name);
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}else if(name.equalsIgnoreCase("PoleStar")){
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star = new PoleStar(name);
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}else if(name.equalsIgnoreCase("DraughStar")){
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star = new DraughStar(name);
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}
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starStock.put(name, star);
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return star;
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}
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}

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