CODEWITHSUNDEEP
javareference
Bipin Paudel
Bipin Paudel

Reputation: 85

Difference between the two methods of reference variables

public class Player {
}

public class main {
    public static void main(String []args) {
      Player p1 ;
      Player p2 = new Player();
    }
}

In the following program, what is the difference between creating variable using Player p1 and Player p2 = new Player(); ???

I am confused at that part.

Thanks in advance

Upvotes: 0

Views: 40

Answers (3)

Gmnd-i
Gmnd-i

Reputation: 125

Player p2 = new Player(); this uses the constructor in the class "Player" to initialize the p2.

Player p1; This doesn't make new Player object.

http://msdn.microsoft.com/en-us/library/x9afc042.aspx read the Creating Objects session for more information

Upvotes: 1

user1897277
user1897277

Reputation: 495

P1 is just a reference, no object assigned (you can use it later stage).
P2 is a reference with object assigned through "new player()".

Upvotes: 1

Kumar Kailash
Kumar Kailash

Reputation: 1395

There are three parts in creating an object in a class.

Player p2=new Player(); 1.Declaration: The code set in bold are all variable declarations that associate a variable name with an object type. 2. Instantiation: The new keyword is a Java operator that creates the object. 3. Initialization: The new operator is followed by a call to a constructor, which initializes the new object.

when you say Player p1 ; just like in any other language, you just create a reference variable of type Player. Player p2=new Player();

here p2 is been declared, instantiated and initialized.

Note: the object for p2 is created when a new keyword is used and are always created in heap memory. Thus you can operate on its members through the .(Dot) operators.

Upvotes: 2

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