I'm reading a book about java. It just got to explaining how you create a class called "deck" which contains an array of cards as its instance variable(s). Here is the code snippit:

class Deck { 
Card[] cards; 
public Deck (int n) { 
cards = new Card[n]; 
} 
} 

why isn't the this. command used?

for example why isn't the code this:

class Deck { 
Card[[] cards; 
public Deck (int n) { 
this.cards = new Card[n];
}
}