Abstract Factory Design Pattern

    Abstract Factory patterns work around a super-factory which creates other factories. This factory is also called as factory of factories. This type of design pattern comes under creational pattern as this pattern provides one of the best ways to create an object.

package com.journaldev.design.model;

 

public abstract class Computer {

     

    public abstract String getRAM();

    public abstract String getHDD();

    public abstract String getCPU();

     

    @Override

    public String toString(){

        return "RAM= "+this.getRAM()+", HDD="+this.getHDD()+", CPU="+this.getCPU();

    }

}

package com.journaldev.design.model;

 

public class PC extends Computer {

 

    private String ram;

    private String hdd;

    private String cpu;

     

    public PC(String ram, String hdd, String cpu){

        this.ram=ram;

        this.hdd=hdd;

        this.cpu=cpu;

    }

    @Override

    public String getRAM() {

        return this.ram;

    }

 

    @Override

    public String getHDD() {

        return this.hdd;

    }

 

    @Override

    public String getCPU() {

        return this.cpu;

    }

 

}

package com.journaldev.design.model;

 

 

public class Server extends Computer {

 

    private String ram;

    private String hdd;

    private String cpu;

     

    public Server(String ram, String hdd, String cpu){

        this.ram=ram;

        this.hdd=hdd;

        this.cpu=cpu;

    }

    @Override

    public String getRAM() {

        return this.ram;

    }

 

    @Override

    public String getHDD() {

        return this.hdd;

    }

 

    @Override

    public String getCPU() {

        return this.cpu;

    }

 

}

package com.journaldev.design.abstractfactory;

import com.journaldev.design.model.Computer;

public interface ComputerAbstractFactory {

    public Computer createComputer();

}

package com.journaldev.design.abstractfactory;

import com.journaldev.design.model.Computer;

import com.journaldev.design.model.PC;

public class PCFactory implements ComputerAbstractFactory {

    private String ram;

    private String hdd;

    private String cpu;

   

    public PCFactory(String ram, String hdd, String cpu){

        this.ram=ram;

        this.hdd=hdd;

        this.cpu=cpu;

    }

    @Override

    public Computer createComputer() {

        return new PC(ram,hdd,cpu);

    }

}

package com.journaldev.design.abstractfactory;

import com.journaldev.design.model.Computer;

import com.journaldev.design.model.Server;

public class ServerFactory implements ComputerAbstractFactory {

    private String ram;

    private String hdd;

    private String cpu;

   

    public ServerFactory(String ram, String hdd, String cpu){

        this.ram=ram;

        this.hdd=hdd;

        this.cpu=cpu;

    }

   

    @Override

    public Computer createComputer() {

        return new Server(ram,hdd,cpu);

    }

}

package com.journaldev.design.abstractfactory;

import com.journaldev.design.model.Computer;

public class ComputerFactory {

    public static Computer getComputer(ComputerAbstractFactory factory){

        return factory.createComputer();

    }

}

package com.journaldev.design.test;

import com.journaldev.design.abstractfactory.PCFactory;

import com.journaldev.design.abstractfactory.ServerFactory;

import com.journaldev.design.factory.ComputerFactory;

import com.journaldev.design.model.Computer;

public class TestDesignPatterns {

    public static void main(String[] args) {

        testAbstractFactory();

    }

    private static void testAbstractFactory() {

        Computer pc = ComputerFactory.getComputer(

        new PCFactory("2 GB","500 GB","2.4 GHz"));

        Computer server = ComputerFactory.getComputer(

        new ServerFactory("16 GB","1 TB","2.9 GHz"));

        System.out.println("AbstractFactory PC Config::"+pc);

        System.out.println("AbstractFactory Server Config::"+server);

    }

}