Different instance variables show same value when using get method

Question

I have this piece of code:

class Test {
 public static void main (String[] args){
  Base b1, b2;
  b1= new Base(1);
  b2= new Base(2);

  System.out.println(b1.getX());
  System.out.println(b2.getX());
 }
}


public class Base {
 static int x;
 public Base(){
  x=7;
 }

 public Base( int bM) {
  x=bM;
 }


 public int getX() {
  return x;
 }
}

I was told that this program will return the values 2 and 2 but I cannot understand why. According to what I know it should show 1 and 2. Can someone explain or give a link to an explanation? Thank you.

The clue is in the word static. This should help you out: download.oracle.com/javase/tutorial/java/javaOO/classvars.html — Samir Talwar
– Samir Talwar, Commented Aug 27, 2011 at 18:39
I should probably add that using statics like that is not considered good programming practice by most developers. — Samir Talwar
– Samir Talwar, Commented Aug 27, 2011 at 18:40

Ammar · Accepted Answer · 2011-08-27 18:51:11Z

4

You have declared x as a static member. A static member is shared by all instances of the same class.

static int x;

This is why the output is 2 and 2 If you want that every instance of the class Base has its own value of the member x, you must remove the static keyword.

answered Aug 27, 2011 at 18:51

Ammar

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Comments

Rostislav Matl · Accepted Answer · 2011-08-27 19:15:27Z

1

Static means that it belongs to class, not instance, i.e. it shared by all instances of the class.

answered Aug 27, 2011 at 19:15

Rostislav Matl

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