Breaking News: Grepper is joining You.com. Read the official announcement!

flyweight design pattern example

Add Answer

Deepika Sahu answered on December 30, 2022 Popularity 9/10 Helpfulness 4/10

answer flyweight design pattern example

related When to use flyweight design pattern

related Flyweight Design Pattern

related Flyweight Pattern

related flyweight design pattern

flyweight design pattern example

Comment

// A Java program to demonstrate working of
// FlyWeight Pattern with example of Counter
// Strike Game
import java.util.Random;
import java.util.HashMap;
  
// A common interface for all players
interface Player
{
    public void assignWeapon(String weapon);
    public void mission();
}
  
// Terrorist must have weapon and mission
class Terrorist implements Player
{
    // Intrinsic Attribute
    private final String TASK;
  
    // Extrinsic Attribute
    private String weapon;
  
    public Terrorist()
    {
        TASK = "PLANT A BOMB";
    }
    public void assignWeapon(String weapon)
    {
        // Assign a weapon
        this.weapon = weapon;
    }
    public void mission()
    {
        //Work on the Mission
        System.out.println("Terrorist with weapon "
                           + weapon + "|" + " Task is " + TASK);
    }
}
  
// CounterTerrorist must have weapon and mission
class CounterTerrorist implements Player
{
    // Intrinsic Attribute
    private final String TASK;
  
    // Extrinsic Attribute
    private String weapon;
  
    public CounterTerrorist()
    {
        TASK = "DIFFUSE BOMB";
    }
    public void assignWeapon(String weapon)
    {
        this.weapon = weapon;
    }
    public void mission()
    {
        System.out.println("Counter Terrorist with weapon "
                           + weapon + "|" + " Task is " + TASK);
    }
}
  
// Class used to get a player using HashMap (Returns
// an existing player if a player of given type exists.
// Else creates a new player and returns it.
class PlayerFactory
{
    /* HashMap stores the reference to the object
       of Terrorist(TS) or CounterTerrorist(CT).  */
    private static HashMap <String, Player> hm =
                         new HashMap<String, Player>();
  
    // Method to get a player
    public static Player getPlayer(String type)
    {
        Player p = null;
  
        /* If an object for TS or CT has already been
           created simply return its reference */
        if (hm.containsKey(type))
                p = hm.get(type);
        else
        {
            /* create an object of TS/CT  */
            switch(type)
            {
            case "Terrorist":
                System.out.println("Terrorist Created");
                p = new Terrorist();
                break;
            case "CounterTerrorist":
                System.out.println("Counter Terrorist Created");
                p = new CounterTerrorist();
                break;
            default :
                System.out.println("Unreachable code!");
            }
  
            // Once created insert it into the HashMap
            hm.put(type, p);
        }
        return p;
    }
}
  
// Driver class
public class CounterStrike
{
    // All player types and weapon (used by getRandPlayerType()
    // and getRandWeapon()
    private static String[] playerType =
                    {"Terrorist", "CounterTerrorist"};
    private static String[] weapons =
      {"AK-47", "Maverick", "Gut Knife", "Desert Eagle"};
  
  
    // Driver code
    public static void main(String args[])
    {
        /* Assume that we have a total of 10 players
           in the game. */
        for (int i = 0; i < 10; i++)
        {
            /* getPlayer() is called simply using the class
               name since the method is a static one */
            Player p = PlayerFactory.getPlayer(getRandPlayerType());
  
            /* Assign a weapon chosen randomly uniformly
               from the weapon array  */
            p.assignWeapon(getRandWeapon());
  
            // Send this player on a mission
            p.mission();
        }
    }
  
    // Utility methods to get a random player type and
    // weapon
    public static String getRandPlayerType()
    {
        Random r = new Random();
  
        // Will return an integer between [0,2)
        int randInt = r.nextInt(playerType.length);
  
        // return the player stored at index 'randInt'
        return playerType[randInt];
    }
    public static String getRandWeapon()
    {
        Random r = new Random();
  
        // Will return an integer between [0,5)
        int randInt = r.nextInt(weapons.length);
  
        // Return the weapon stored at index 'randInt'
        return weapons[randInt];
    }
}

Popularity 9/10 Helpfulness 4/10 Language java

Source: www.geeksforgeeks.org

Tags: java

Link to this answer
Share Copy Link

Contributed on Dec 30 2022

Deepika Sahu

0 Answers Avg Quality 2/10

Closely Related Answers

When to use flyweight design pattern

Comment

We can use flyweight pattern in following scenarios:

When we need a large number of similar objects that are unique in terms of only a few parameters and most of the stuffs are common in general.
We need to control the memory consumption by large number of objects – by creating fewer objects and sharing them across.

Popularity 8/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: when whatever wh

Link to this answer
Share Copy Link

Contributed on Dec 30 2022

Deepika Sahu

0 Answers Avg Quality 2/10

Flyweight Design Pattern

Comment

 flyweight design pattern enables use sharing of objects to support large numbers of fine-grained objects efficiently. 
 A flyweight is a shared object that can be used in multiple contexts simultaneously. 
 The flyweight acts as an independent object in each context.

Popularity 8/10 Helpfulness 2/10 Language whatever

Source: Grepper

Tags: whatever whateve

Link to this answer
Share Copy Link

Contributed on Dec 30 2022

Deepika Sahu

0 Answers Avg Quality 2/10

Flyweight Pattern

Comment

using System;
using System.Collections.Generic;

// Flyweight interface
public interface IShape
{
    void Draw(int x, int y);
}

// ConcreteFlyweight
public class Circle : IShape
{
    private readonly string color;

    public Circle(string color)
    {
        this.color = color;
    }

    public void Draw(int x, int y)
    {
        Console.WriteLine($"Drawing a {color} circle at ({x}, {y})");
    }
}

// FlyweightFactory
public class ShapeFactory
{
    private readonly Dictionary<string, IShape> flyweights = new Dictionary<string, IShape>();

    public IShape GetShape(string color)
    {
        if (flyweights.TryGetValue(color, out var shape))
        {
            return shape;
        }

        shape = new Circle(color);
        flyweights[color] = shape;
        return shape;
    }
}

class Program
{
    static void Main()
    {
        // Client code
        ShapeFactory shapeFactory = new ShapeFactory();

        IShape redCircle = shapeFactory.GetShape("Red");
        redCircle.Draw(100, 200);

        IShape blueCircle = shapeFactory.GetShape("Blue");
        blueCircle.Draw(300, 150);

        IShape greenCircle = shapeFactory.GetShape("Green");
        greenCircle.Draw(50, 50);

        /*
         * Sample Output:
         * Drawing a Red circle at (100, 200)
         * Drawing a Blue circle at (300, 150)
         * Drawing a Green circle at (50, 50)
         */
    }
}

Popularity 5/10 Helpfulness 1/10 Language csharp

Source: chat.openai.com

Tags: flyweight-pattern c#

Link to this answer
Share Copy Link

Contributed on Jul 31 2023

mahnaz foroutan

0 Answers Avg Quality 2/10

flyweight design pattern

Comment

6. Flyweight:
The Flyweight pattern minimizes memory usage or computational expenses by sharing as much as possible with related objects.

Example in ReactJS:

Suppose you're rendering a large list of items with some common properties.

// Flyweight Component
const ListItem = ({ text }) => <li>{text}</li>;

// Usage
const App = () => {
  const commonText = "This is a common text shared by multiple items.";

  const items = Array.from({ length: 1000 }, (_, index) => (
    <ListItem key={index} text={commonText} />
  ));

  return (
    <ul>
      {items}
    </ul>
  );
};

Popularity 6/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: javascript

Link to this answer
Share Copy Link

Contributed on Sep 07 2023

Amjad Saeed

0 Answers Avg Quality 2/10

flyweight design pattern

Comment

# Flyweight interface
class Font:
    def render(self, text):
        pass

# Concrete flyweight
class ConcreteFont(Font):
    def __init__(self, font_name):
        self.font_name = font_name

    def render(self, text):
        return f"Rendered '{text}' in '{self.font_name}' font."

# Flyweight factory
class FontFactory:
    _fonts = {}

    @staticmethod
    def get_font(font_name):
        if font_name not in FontFactory._fonts:
            FontFactory._fonts[font_name] = ConcreteFont(font_name)
        return FontFactory._fonts[font_name]

# Client
class TextEditor:
    def __init__(self):
        self.characters = []
        self.font_factory = FontFactory()

    def insert_character(self, char, font_name):
        font = self.font_factory.get_font(font_name)
        self.characters.append((char, font))

    def display(self):
        for char, font in self.characters:
            print(font.render(char))

# Example usage
editor = TextEditor()
editor.insert_character('H', 'Arial')
editor.insert_character('i', 'Times New Roman')
editor.insert_character('!', 'Arial')

editor.display()

Popularity 3/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: whatever

Link to this answer
Share Copy Link

Contributed on Nov 27 2023

Distinct Dogfish

0 Answers Avg Quality 2/10

flyweight design pattern example

Contents

More Related Answers

flyweight design pattern example

Closely Related Answers

When to use flyweight design pattern

Flyweight Design Pattern

Flyweight Pattern

flyweight design pattern

flyweight design pattern

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.