CODEWITHSUNDEEP
javathis
harel perry
harel perry

Reputation: 49

Is it possible to assign a new object into 'this'?

I have some calculation made in the constructor of a class and now let assume I want to change one of the variable field in this class, which will affect the calculation that have been made before.

For each time I will call any set method I will need to run again the calculation (or copy the code twice (which is bad coding..))

I think the code will look better if I could do like as shown below, I just want to know what is the reason it can't be done?

class Entity
{
    private int x,y,z;
    public Entity(int x,int y,int z)
    {
      Calculating();
    }
    private void Calculating()
    {
      // ... 
    }
    public void Set_X(int x)
    {
      this = new Entity(x,this.y,this.z)
    }
}

Upvotes: 0

Views: 88

Answers (1)

Jochen Reinhardt
Jochen Reinhardt

Reputation: 843

You cannot assign a new object to this. This always references the current object.

Why don't you just set X and invoke the Calculting() method from Set_X? This will change the current object's state.

If you do not want to change the current object, e.g. because of other references to it, you will have to create a new instance and return it from Set_X.

Upvotes: 4

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