Doubt about chapter 3, self test question 3 (K&B7)

[Sourish Vaghulade]

public class Network {
	Network(int x, Network n) {
		id = x;
		p = this;
		if (n != null)
			p = n;
	}

	int id;
	Network p;

	public static void main(String[] args) {
		Network n1 = new Network(1, null);
		n1.go(n1);
	}

	void go(Network n1) {
		Network n2 = new Network(2, n1);
		Network n3 = new Network(3, n2);
		System.out.println(n3.p.p.id);
	}
}

What does 'this' on line 4 mean??  

[Roel De Nijs]

Hi Sourish Vaghulade,

First of all, a warm welcome to CodeRanch!

Sourish Vaghulade wrote:What does 'this' on line 4 mean??  

Have a look at this topic! It explains the same mock question and exactly the same question as yours is asked in this topic. So definitely worth reading!

Hope it helps!
Kind regards,
Roel