CODEWITHSUNDEEP
javaoop
Amit
Amit

Reputation: 177

Changing an object from an object inside of it

If an object is inside of an object how do I manipulate the object it is inside of

Simple example of what I mean written below

How do I be able to make the mouse manipulate the cage variables (decrease cage strength). 

public class Cage{
     public Cage(){
          cageStrength = 1;
          Mouse foo = new Mouse ();
          foo.eat();
     }
    public void changeCageStrength(){
        cageStrength--;
    }
}

}

public class Mouse{

     if(condition){
          eatPartOfCage();
      }
}
public void eatPartOfCage(){
     decrease cage strength;
}

Upvotes: 0

Views: 61

Answers (1)

Elliott Frisch
Elliott Frisch

Reputation: 201409

You would need to establish a relationship beyond the fact that Mouse foo is a variable in a constructor of Cage. For example,

public class Cage {
    private Mouse foo;
    private int cageStrength;
    public Cage() {
        cageStrength = 1;
        foo = new Mouse(this);
    }
    public void changeCageStrength() {
        cageStrength--;
    }
}

And then your Mouse foo can invoke Cage.changeCageStrength() in eat() like

public class Mouse {
    private Cage cage;
    public Mouse(Cage cage) {
        this.cage = cage;
    }
    public void eat() {
        cage.changeCageStrength();
    }
}

Upvotes: 3

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