The Factory Pattern is a creational design pattern that provides an interface for creating objects, 
but delegates the decision of which class to instantiate to subclasses.
 It promotes loose coupling between the client code and the created objects by abstracting the object creation process. 
The Factory Pattern is particularly useful when you have a group of related objects that need to be created based on certain criteria or configuration.
 
 
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();

    }

}
 
public class ComputerFactory {


 public static Computer getComputer(String type, String ram, String hdd, String cpu){
 if("PC".equalsIgnoreCase(type))
 return new PC(ram, hdd, cpu);
 else if("Server".equalsIgnoreCase(type))
 return new Server(ram, hdd, cpu);


 return null;

    }

}
 
 
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;

    }



}
 
 
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;

    }



}
 
 
public class TestFactory {


 public static void main(String[] args) {
 Computer pc = ComputerFactory.getComputer("pc","2 GB","500 GB","2.4 GHz");
 Computer server = ComputerFactory.getComputer("server","16 GB","1 TB","2.9 GHz");
 System.out.println("Factory PC Config::"+pc);
 System.out.println("Factory Server Config::"+server);

    }



}
 
 
Factory PC Config::RAM= 2 GB, HDD=500 GB, CPU=2.4 GHz
Factory Server Config::RAM= 16 GB, HDD=1 TB, CPU=2.9 GHz