Java Design Pattern: Abstract Factory

Abstract Factory pattern adds another layer of abstraction for Factory pattern. If we compare Abstract Factory with Factory, it is pretty obvious that a new layer of abstraction is added. Abstract Factory is a super-factory which creates other factories. We can call it “Factory of factories”.

Abstract Factory class diagram

Abstract Factory Java code

 

interface CPU {    void process();} interface CPUFactory {CPU produceCPU();} class AMDFactory implements CPUFactory {    public CPU produceCPU() {        return new AMDCPU();    }} class IntelFactory implements CPUFactory {    public CPU produceCPU() {        return new IntelCPU();    }} class AMDCPU implements CPU {    public void process() {        System.out.println("AMD is processing...");    }} class IntelCPU implements CPU {    public void process() {        System.out.println("Intel is processing...");    }} class Computer {CPU cpu;     public Computer(CPUFactory factory) {    cpu = factory.produceCPU();        cpu.process();    }} public class Client {    public static void main(String[] args) {        new Computer(createSpecificFactory());    }     public static CPUFactory createSpecificFactory() {        int sys = 0; // based on specific requirement        if (sys == 0)         return new AMDFactory();        else         return new IntelFactory();    }} 

 

 

Real use example

Actually, this is a very important concept of modern frameworks. Here is a question about this.

 

FROM: http://www.programcreek.com/2013/02/java-design-pattern-abstract-factory/