CODEWITHSUNDEEP
javaclass
House3272
House3272

Reputation: 1037

What does this declare?

public class Neat {

    public Neat asdf;
}

does this make an object of the class Neat? I'm currently trying to learn Linked Lists, if that helps.

I've no idea how to Google this, sorry.

Upvotes: 2

Views: 110

Answers (4)

Hardip Patel
Hardip Patel

Reputation: 85

public class Neat {

public Neat asdf; //Focus here

public static void main(String...string){
    Neat n = new Neat();
}
}

No,It does not create an object, its is just a variable having potential to have object of Neat class but

public class Neat {

public Neat asdf = new Neat(); //Focus here

public static void main(String...string){
    Neat n = new Neat();
}
}

It will make as many object of Neat and eventually result in StackOverFlow...

Upvotes: 0

Kon
Kon

Reputation: 10810

This is a class with a member variable that is of the same type as the class. This is perfectly legal in this case, however it can be dangerous. For example, if you change your code to merely instantiate the variable

public Neat asdf = new Neat();

Then create a Neat elsewhere, your program will crash with a StackOverflowError because each instance creates a new instance, which creates a new instance, and so on. As it stands, your program creates a reference variable, but not an instance, so no further instances are created.

Upvotes: 0

cmd
cmd

Reputation: 11841

This creates a class namedNeat that declares a member variable named asdf of type Neat. The member variable asdf is a reference to null.

This code, as is, does not create an instance of an object Neat

Upvotes: 3

Justin Lessard
Justin Lessard

Reputation: 11911

This declare a field of type Neat. So the Neat object will have a children Neat field.

 Neat n = new Neat();
 n.asdf = new Neat();

Upvotes: 0

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