CODEWITHSUNDEEP
javareferencethis
Jeremy
Jeremy

Reputation: 1364

Java this parameter

Quick question, I tried to find a satisfactory answer on my own.

Say I have 2 classes Object1 and Object2. Now I want Object2 to do use Object1's resources so I do this

Object1 obj1;
    public Object2(Object1 o){
        obj1 = o;
    }

and in Object1 I do this

new Object2(this);

Does this give each Object2 an Object1, or does it simply point to the Object1 as expected?

Upvotes: 0

Views: 155

Answers (3)

sethupathi.t
sethupathi.t

Reputation: 502

you can use IS-A relationship

Object2 extends Object1{ }

so now Object2 can use Object2 resources as well as Object1 resources. suppose you want vise versa, you can use HAS-A relationship

Object1 has Object2 reference like this

Object1{ Object2 obj2; }

Object2 has Object1 reference like this

Object2{ Object1 obj1; }

Upvotes: 0

SuperTron
SuperTron

Reputation: 4243

It will point to Object1 as expected. This is because Java stores object variables as "references"("pointers" if you like thinking in C) and, when you pass this reference by value, you are giving the function the objects reference.. There is a good basic tutorial on this functionality here. Hope this helps.

Upvotes: 1

Pablo Santa Cruz
Pablo Santa Cruz

Reputation: 181350

It simply uses a reference (points) to Object1. Whenever you change o in Object2 class, you will be changing original obj1 object also.

Upvotes: 1

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