avoiding if statements

Question

I was thinking about object oriented design today, and I was wondering if you should avoid if statements. My thought is that in any case where you require an if statement you ca

Answer 1

Assume we have conditional values.

public void testMe(int i){

if(i=1){
somevalue=value1;
}


if(i=2){
 somevalue=value2;
}

if(i=3){
somevalue=value3;
}

}

//**$$$$$you can replace the boring IF blocks with Map.$$$$$**

// ============================================================

Same method would look like this:
--------------------------------
public void testMe(int i){

Map map = new HashMap();

map.put(1,value1);
map.put(2,value2);
map.put(3,value3);

}
This will avoid the complicated if conditions.

You can use simliar solution when using factory patterns for loading classes.

public void loadAnimalsKingdom(String animalKingdomType)
    if(animalKingdomType="bird"){
    Bird b = new Bird();
    }
    if(animalKingdomType="animal"){
    Animal a= new Animal();
    }
    if(animalKingdomType="reptile"){
    Reptile r= new Reptile();
    }
  }

Now using map :

   public void loadAnimalsKingdom(String animalKingdomType)
    {
       Map  map = new HashMap();

       map.put("bird","com.animalworld.Bird.Class");
       map.put("animal","com.animalworld.Animal.Class");
       map.put("reptile","com.animalworld.Reptile.Class");

       map.get(animalKingdomType);

***Use class loader to load the classes on demand once you extract the required class from the map.***
}

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