Introduction to factory Model

A simple calculator example to describe the factory Mode

Operator public interface

Package com. ISS. factory;


Public interface operator {
Public int getresult (int x, int y );


}

Add. Java

Package com. ISS. factory;


Public class add implements operator {


@ Override
Public int getresult (int x, int y ){
// Todo auto-generated method stub
Return X + Y;
}


}

Minus. Java

Package com. ISS. factory;


Public class minus implements operator {


@ Override
Public int getresult (int x, int y ){
// Todo auto-generated method stub
Return x-y;
}


}

Mul. Java

Package com. ISS. factory;


Public class Mul implements operator {


@ Override
Public int getresult (int x, int y ){
// Todo auto-generated method stub
Return x * Y;
}


}

Divide. Java

Package com. ISS. factory;


Public class divide implements operator {


@ Override
Public int getresult (int x, int y ){
// Todo auto-generated method stub
Return x/y;
}


}

Operatorfactory. Class

Package com. ISS. factory;


Public class operatorfactory {
Private Static Operator = NULL;


Public static operator getoperator (string OP ){


If (OP = "+ "){
Operator = new add ();
} Else if (OP = "-"){
Operator = new minus ();
} Else if (OP = "*"){
Operator = new MUL ();
} Else if (OP = "/"){
Operator = new divide ();
} Else {
Return NULL;
}


Return operator;


}


}

Test. Java

Package com. ISS. factory;


Public class test {
Public static void main (string [] ARGs ){
Operator = operatorfactory. getoperator ("+ ");
System. Out. println (operator. getresult (10, 20 ));
}


}

Conclusion: The factory model mainly utilizes the object-oriented polymorphism feature. The program has multiple options during actual running!