what can be static???

[Leandro Oliveira]

what can be static??? classes??? methods??? variables???what happens inside JVM when I have an class whith some static code, and then I create 2 objects with this class. If I try to access a static method which is not synchronized and try to access a non-static method Which is not synchronized using those 2 objects simultaneously. The jvm treats static and non-static methods equally??? The execution of method main, causes a thread. The most important thread. Which is not daemon. Is this true???

[Thomas Paul]

A method can be static. A variable can be static. Static variables are shared by all users of the class. Static methods are simply methods that can be executed without instantiating the class they are in.

[Mellihoney Michael]

a static variable can't be a reference variable, and a static method can be easily accessed without creating an instance of the class where that method lies.
[ December 14, 2002: Message edited by: Melliholic Michael ]

[Leandro Oliveira]

I'm very young with java. I wrote a code and it compiled:
import javax.swing.JButton;
public class test{
static int a=10;
static JButton button=new JButton("button");
}

in this case button is a static variable, which has a reference type! isn't it???

[Mellihoney Michael]

leandro oliveira,you are right, I made a mistake!
A final var can't be a reference variable!!!
Thanks for your reminding!

[Neil Laurance]

Originally posted by Melliholic Michael:
leandro oliveira,you are right, I made a mistake!
A final var can't be a reference variable!!!
Thanks for your reminding!

Um, not sure what you are saying here? Both final variables and static final variables are not limited to primitives only. For example:

public class Finals {
  public final static StringBuffer final1 = new StringBuffer("final1");
  public final String final2;
  public Finals(String string) {
    final2 = string;
  }
  public static void change() {
    final1.setCharAt(0, 'F');
  }
  public String toString() {
    return "final static was: "+final1+
           "\nfinal was: "+final2;
  }
  public static void main(String[] args) {
    Finals finals = new Finals("foo");
    Finals.change();
    System.out.println(finals);
  }
}

Returns:

final static was: Final1
final was: foo

Note how the contents of the final static StringBuffer can change, although the reference itself cannot. :roll: :roll: