iluwatar / java-design-patterns

Design patterns implemented in Java

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Design patterns implemented in Java

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Introduction

Design patterns are the best, formalized practices a programmer can use to solve common problems when designing an application or system.

Design patterns can speed up the development process by providing tested, proven development paradigms.

Reusing design patterns helps prevent subtle issues that cause major problems, and it also improves code readability for coders and architects who are familiar with the patterns.

Getting started

This site showcases Java Design Patterns. The solutions have been developed by experienced programmers and architects from the open-source community. The patterns can be browsed by their high-level descriptions or by looking at their source code. The source code examples are well commented and can be thought of as programming tutorials on how to implement a specific pattern. We use the most popular battle-proven open-source Java technologies.

Before you dive into the material, you should be familiar with various Software Design Principles.

All designs should be as simple as possible. You should start with KISS, YAGNI, and Do The Simplest Thing That Could Possibly Work principles. Complexity and patterns should only be introduced when they are needed for practical extensibility.

Once you are familiar with these concepts you can start drilling down into the available design patterns by any of the following approaches

  • Search for a specific pattern by name. Can't find one? Please report a new pattern here.
  • Using tags such as Performance, Gang of Four or Data access.
  • Using pattern categories, Creational, Behavioral, and others.

Hopefully, you find the object-oriented solutions presented on this site useful in your architectures and have as much fun learning them as we had while developing them.

How to contribute

If you are willing to contribute to the project you will find the relevant information in our developer wiki. We will help you and answer your questions in the Gitter chatroom.

License

This project is licensed under the terms of the MIT license.

Contributors

Ilkka Seppälä
Ilkka Seppälä

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Subhrodip Mohanta
Subhrodip Mohanta

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amit1307
amit1307

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Narendra Pathai
Narendra Pathai

💻 🤔 👀
Jeroen Meulemeester
Jeroen Meulemeester

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Joseph McCarthy
Joseph McCarthy

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Thomas
Thomas

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Anurag Agarwal
Anurag Agarwal

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Markus Moser
Markus Moser

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Sabiq Ihab
Sabiq Ihab

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Amit Dixit
Amit Dixit

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Piyush Kailash Chaudhari
Piyush Kailash Chaudhari

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joshzambales
joshzambales

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Kamil Pietruszka
Kamil Pietruszka

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Zafar Khaydarov
Zafar Khaydarov

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Paul Campbell
Paul Campbell

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Argyro Sioziou
Argyro Sioziou

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TylerMcConville
TylerMcConville

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saksham93
saksham93

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nikhilbarar
nikhilbarar

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Colin But
Colin But

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Ruslan
Ruslan

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Juho Kang
Juho Kang

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Dheeraj Mummareddy
Dheeraj Mummareddy

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Bernardo Sulzbach
Bernardo Sulzbach

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Aleksandar Dudukovic
Aleksandar Dudukovic

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Yusuf Aytaş
Yusuf Aytaş

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Mihály Kuprivecz
Mihály Kuprivecz

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Stanislav Kapinus
Stanislav Kapinus

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GVSharma
GVSharma

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Srđan Paunović
Srđan Paunović

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Petros G. Sideris
Petros G. Sideris

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Pramod Gupta
Pramod Gupta

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Amarnath Chandana
Amarnath Chandana

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Anurag870
Anurag870

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Wes Gilleland
Wes Gilleland

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Harshraj Thakor
Harshraj Thakor

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Martin Vandenbussche
Martin Vandenbussche

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Alexandru Somai
Alexandru Somai

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Artur Mogozov
Artur Mogozov

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anthony
anthony

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Christian Cygnus
Christian Cygnus

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Dima Gubin
Dima Gubin

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Joshua Jimenez
Joshua Jimenez

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Kai Winter
Kai Winter

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lbroman
lbroman

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Przemek
Przemek

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Prafful Agarwal
Prafful Agarwal

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Sanket Panhale
Sanket Panhale

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staillebois
staillebois

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Krisztián Nagy
Krisztián Nagy

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Alexander Ivanov
Alexander Ivanov

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Yosfik Alqadri
Yosfik Alqadri

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Agustí Becerra Milà
Agustí Becerra Milà

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Juan Manuel Suárez
Juan Manuel Suárez

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Luigi Cortese
Luigi Cortese

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Katarzyna Rzepecka
Katarzyna Rzepecka

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adamski.pro
adamski.pro

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Shengli Bai
Shengli Bai

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Boris
Boris

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Dmitry Avershin
Dmitry Avershin

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靳阳
靳阳

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hoangnam2261
hoangnam2261

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Arpit Jain
Arpit Jain

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Jón Ingi Sveinbjörnsson
Jón Ingi Sveinbjörnsson

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Kirill Vlasov
Kirill Vlasov

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Mitchell Irvin
Mitchell Irvin

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Ranjeet
Ranjeet

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PhoenixYip
PhoenixYip

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M Saif Asif
M Saif Asif

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kanwarpreet25
kanwarpreet25

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Leon Mak
Leon Mak

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Per Wramdemark
Per Wramdemark

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Evan Sia Wai Suan
Evan Sia Wai Suan

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AnaghaSasikumar
AnaghaSasikumar

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Christoffer Hamberg
Christoffer Hamberg

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Dominik Gruntz
Dominik Gruntz

💻
Hannes
Hannes

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Leo Gutiérrez Ramírez
Leo Gutiérrez Ramírez

💻
Zhang WH
Zhang WH

💻
Christopher O'Connell
Christopher O'Connell

💻
George Mavroeidis
George Mavroeidis

💻
Hemant Bothra
Hemant Bothra

💻 🎨
Kevin Peters
Kevin Peters

💻
George Aristy
George Aristy

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Mahendran Mookkiah
Mahendran Mookkiah

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Azureyjt
Azureyjt

💻
gans
gans

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Matt
Matt

🖋
Gopinath Langote
Gopinath Langote

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Hoswey
Hoswey

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Amit Pandey
Amit Pandey

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gwildor28
gwildor28

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田浩
田浩

🖋
Stamatis Pitsios
Stamatis Pitsios

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qza
qza

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Rodolfo Forte
Rodolfo Forte

🖋
Ankur Kaushal
Ankur Kaushal

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Ovidijus Okinskas
Ovidijus Okinskas

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Robert Kasperczyk
Robert Kasperczyk

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Tapio Rautonen
Tapio Rautonen

💻
Yuri Orlov
Yuri Orlov

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Varun Upadhyay
Varun Upadhyay

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Aditya Pal
Aditya Pal

💻
grzesiekkedzior
grzesiekkedzior

💻 👀
Sivasubramani M
Sivasubramani M

💻
Sami Airaksinen
Sami Airaksinen

💻
Janne Sinivirta
Janne Sinivirta

💻
Boris-Chengbiao Zhou
Boris-Chengbiao Zhou

🖋
Jacob Hein
Jacob Hein

🖋
Richard Jones
Richard Jones

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Rachel M. Carmena
Rachel M. Carmena

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Zaerald Denze Lungos
Zaerald Denze Lungos

🖋
Lars Kappert
Lars Kappert

🖋
Mike Liu
Mike Liu

🌍
Matt Dolan
Matt Dolan

💻 👀
Manan
Manan

👀
Nishant Arora
Nishant Arora

💻
Peeyush
Peeyush

💻
Rakesh
Rakesh

💻 👀
Wei Seng
Wei Seng

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Ashish Trivedi
Ashish Trivedi

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洪月阳
洪月阳

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xdvrx1
xdvrx1

👀 🤔
Bethan Palmer
Bethan Palmer

💻
Toxic Dreamz
Toxic Dreamz

💻
Edy Cu Tjong
Edy Cu Tjong

📖
Michał Krzywański
Michał Krzywański

💻
Stefan Birkner
Stefan Birkner

💻
Fedor Skvorcov
Fedor Skvorcov

💻
samilAyoub
samilAyoub

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Vladislav Golubinov
Vladislav Golubinov

💻
Swaraj
Swaraj

💻
Christoph Flick
Christoph Flick

📖
Ascênio
Ascênio

👀
Domenico Sibilio
Domenico Sibilio

📖
Akash Chandwani
Akash Chandwani

👀
Pavlo Manannikov
Pavlo Manannikov

💻
Eiman
Eiman

💻
Rocky
Rocky

📖
Ibrahim ali abdelghany
Ibrahim ali abdelghany

👀
Girish Kulkarni
Girish Kulkarni

📖
Omar Karazoun
Omar Karazoun

💻
Jeff Evans
Jeff Evans

💻
Vivek Singh
Vivek Singh

💻
siavash
siavash

💻
ruchpeanuts
ruchpeanuts

📖
warp125
warp125

🌍
KHADIR Tayeb
KHADIR Tayeb

🌍
ignite1771
ignite1771

💻
Halil Demir
Halil Demir

🌍
Rohit Singh
Rohit Singh

💻
byoungju94
byoungju94

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Moustafa Farhat
Moustafa Farhat

🌍
Martel Richard
Martel Richard

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va1m
va1m

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Noam Greenshtain
Noam Greenshtain

💻
yonghong Xu
yonghong Xu

📖
jinishavora
jinishavora

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Elvys Soares
Elvys Soares

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zWeBrain
zWeBrain

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余林颖
余林颖

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Alain
Alain

🌍
VR
VR

📖
JackieNim
JackieNim

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EdisonE3
EdisonE3

💻
Tao
Tao

💻
Juan Manuel Abate
Juan Manuel Abate

🌍
Xenilo137
Xenilo137

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Samuel Souza
Samuel Souza

💻
Marlo Henrique
Marlo Henrique

🌍
AndriyPyzh
AndriyPyzh

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karthikbhat13
karthikbhat13

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Morteza Adigozalpour
Morteza Adigozalpour

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Nagaraj Tantri
Nagaraj Tantri

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Francesco Scuccimarri
Francesco Scuccimarri

💻
Conny Hansson
Conny Hansson

📖
Muklas Rahmanto
Muklas Rahmanto

🌍
Vadim
Vadim

🌍
Simran Keshri
Simran Keshri

💻
JCarlos
JCarlos

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Ali Ghasemi
Ali Ghasemi

💻
Carl Dea
Carl Dea

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Mozartus
Mozartus

🌍
Manvi Goel
Manvi Goel

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Anum Amin
Anum Amin

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Reo Uehara
Reo Uehara

🌍
Fiordy
Fiordy

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Harshal
Harshal

💻
Abhinav Vashisth
Abhinav Vashisth

📖
Kevin
Kevin

👀 💻
Shrirang
Shrirang

👀 💻
interactwithankush
interactwithankush

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CharlieYu
CharlieYu

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Leisterbecker
Leisterbecker

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DragonDreamer
DragonDreamer

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ShivanshCharak
ShivanshCharak

💻
HattoriHenzo
HattoriHenzo

💻
Arnab Sen
Arnab Sen

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MohanaRao SV
MohanaRao SV

💻
Yonatan Karp-Rudin
Yonatan Karp-Rudin

💻 👀
Oliani
Oliani

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Renjie LIU
Renjie LIU

💻
perfect guy
perfect guy

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xyllq999
xyllq999

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Mohamed Bilal
Mohamed Bilal

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Karshil sheth
Karshil sheth

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kongleong86
kongleong86

💻
Aitor Fidalgo Sánchez
Aitor Fidalgo Sánchez

🌍 📖 👀
Victor He
Victor He

💻
Minh Nguyen
Minh Nguyen

🌍 📖
Victor He
Victor He

📖
yiichan
yiichan

📖
Pan Sem
Pan Sem

📖
zhoumengyks
zhoumengyks

💻
you
you

🌍
Thanks
Thanks

🌍
LazyProgrammer
LazyProgrammer

📖
Mohammed Faizan Ahmed
Mohammed Faizan Ahmed

📖
Bruno Fernandes
Bruno Fernandes

💻
SammanPali
SammanPali

📖
Qixiang Chen
Qixiang Chen

📖
Shourya Manekar
Shourya Manekar

🌍
Alan
Alan

🌍
JanFidor
JanFidor

💻 📖
Anton Yakutovich
Anton Yakutovich

💻
steph88ss
steph88ss

📖
Yujan Ranjitkar
Yujan Ranjitkar

🌍
yusha-g
yusha-g

🌍
Robert Volkmann
Robert Volkmann

💻 👀
Bipin Kumar Chaurasia
Bipin Kumar Chaurasia

📖
KyleSong30
KyleSong30

📖
u7281975
u7281975

📖
harshalkhachane
harshalkhachane

💻
Tejas Singh
Tejas Singh

📖 🌍
Sudarsan Balaji
Sudarsan Balaji

💻
Vaibhav Agrawal
Vaibhav Agrawal

📖
u7275858
u7275858

💻
prasad-333
prasad-333

📖
JurenXu
JurenXu

💻
murphShaw
murphShaw

📖
XianWu99
XianWu99

📖
JoshuaSinglaANU
JoshuaSinglaANU

💻
Ricardo Ramos
Ricardo Ramos

🌍
Farid Zouheir
Farid Zouheir

🌍
Vinícius A. B.
Vinícius A. B.

🌍
Stefanel Stan
Stefanel Stan

💻
Prince bhati
Prince bhati

🌍
WuLang
WuLang

📖
Hugo Kat
Hugo Kat

💻
Shivanagouda Agasimani
Shivanagouda Agasimani

💻
Aparna
Aparna

💻
Girolamo Giordano
Girolamo Giordano

🌍
Chak-C
Chak-C

💻
Nakul Nambiar
Nakul Nambiar

💻
KarmaTashiCat
KarmaTashiCat

🌍
marikattt
marikattt

💻
Hashvardhan Parmar
Hashvardhan Parmar

🌍
YongHwan
YongHwan

📖 🌍
Shogo Hida
Shogo Hida

🌍
Eugene
Eugene

💻
Piyush
Piyush

📖
Rahul Raj
Rahul Raj

💻
Bharath Kalyan S
Bharath Kalyan S

💻
Saiteja Reddy
Saiteja Reddy

🌍
Enrique Clerici
Enrique Clerici

🌍
Ramil Sayetov
Ramil Sayetov

🌍
东方未白
东方未白

💻
Fredrik Sejr
Fredrik Sejr

🌍
akshatarora0013
akshatarora0013

💻
Mughees Qasim
Mughees Qasim

💻
behappyleee
behappyleee

🌍
Ayush Thakur
Ayush Thakur

🌍
Anthony Bosch
Anthony Bosch

💻
trananso
trananso

📖
Giammaria Biffi
Giammaria Biffi

🌍
Saiful Haque
Saiful Haque

💻
JabezBrew
JabezBrew

💻
konstantin-goldman
konstantin-goldman

📖
Tien Nguyen Minh
Tien Nguyen Minh

💻 🌍
Vladimir
Vladimir

🌍
Surjendu
Surjendu

🌍
bakazhou
bakazhou

💻
Owen Leung
Owen Leung

💻
Stavros Barousis
Stavros Barousis

📖
Syyed Ibrahim Abdullah
Syyed Ibrahim Abdullah

🌍
JiaDi Zhang
JiaDi Zhang

🌍
Sanchit Bansal
Sanchit Bansal

📖
Md Saiful Islam
Md Saiful Islam

📖
Antonio Addeo
Antonio Addeo

📖 💻
Allagadda Sai Upendranath
Allagadda Sai Upendranath

📖
Matheus Braga
Matheus Braga

🌍 📖
Appari Satya Barghav
Appari Satya Barghav

📖
Marcel Ribeiro-Dantas
Marcel Ribeiro-Dantas

📖
Muhammad Hanif Amrullah
Muhammad Hanif Amrullah

🌍
JackH408
JackH408

📖
Shubham
Shubham

🌍
Nishant Jain
Nishant Jain

📖
Rhitam Chaudhury
Rhitam Chaudhury

📖
JerryZhao275
JerryZhao275

📖
Leonardo Lisanti
Leonardo Lisanti

🌍
Yennifer Herrera
Yennifer Herrera

🌍 👀
jnniu-n
jnniu-n

🌍 📖
Miguel Angel Perez Garcia
Miguel Angel Perez Garcia

👀 🌍
Suwan Sankaja
Suwan Sankaja

🌍
alok
alok

📖
Daniel Lisboa
Daniel Lisboa

🌍
Sam Powell
Sam Powell

📖
João Fernandes
João Fernandes

🌍
Hong Geon-ui
Hong Geon-ui

🌍
Doksanbir
Doksanbir

💻 📖 👀
Chant3ll3
Chant3ll3

📖 🌍
YongHwan Kwon
YongHwan Kwon

💻
Jakub Klimek
Jakub Klimek

💻
believe
believe

🌍
egg0102030405
egg0102030405

🌍 📖
Ved Asole
Ved Asole

💻
NewMorning
NewMorning

🌍
资深老萌新
资深老萌新

🌍
Seunghwan Jeon
Seunghwan Jeon

🌍
sugavanesh
sugavanesh

💻
FinnS-F
FinnS-F

💻
jerryyummy
jerryyummy

🌍
Manoj Chowdary
Manoj Chowdary

💻
Aditya
Aditya

📖
nooynayr
nooynayr

📖
CYBERCRUX2
CYBERCRUX2

📖
Luis Mateo Hincapié Martinez
Luis Mateo Hincapié Martinez

🌍
guqing
guqing

💻
Sashir Estela
Sashir Estela

💻
omahs
omahs

📖
leif e.
leif e.

💻
Jun Kang
Jun Kang

💻
Kishalay Pandey
Kishalay Pandey

💻

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Design patterns implemented in Java

https://java-design-patterns.com

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