Java: Initialiasing objects inside or outside the constructor? [duplicate]

Question

I am interested in understanding whether there is any difference between initialising an object inside or outside the constructor

public class HTMLTable {
int value1;
Scanner user_input;

  public HTMLTable () {
    user_input = new Scanner(System.in);
    value = user_input.next();
  }
}

Instead of:

public class HTMLTable {
int value1;
Scanner user_input = new Scanner(System.in);

  public HTMLTable () {
    value = user_input.next();
  }
}

Can someone explain?

And stackoverflow.com/questions/3918578/…

Steve Chambers
– Steve Chambers

2013-03-11 10:57:47 +00:00
Commented Mar 11, 2013 at 10:57 — Steve Chambers
– Steve Chambers, Commented Mar 11, 2013 at 10:57

sp00m · Accepted Answer · 2013-03-11 11:00:10Z

5

There's no difference: the compiler will move any outside initialization within the constructor.

See Java for a Nutshell, section 3.2.4: Field Defaults and Initializers.

edited Mar 11, 2013 at 11:00

answered Mar 11, 2013 at 10:55

sp00m

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Comments

Alexei Kaigorodov · Accepted Answer · 2013-03-11 10:57:32Z

2

There is no difference. Compiler would move initialization code (like in 2nd example) into constructor body anyway. Chose this or that variant depending on readability of the code.

answered Mar 11, 2013 at 10:57

Alexei Kaigorodov

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