Initialization sequence

[Asif Iqbal]

hi all!

Can anyone one explain me initailization sequence i.e. for

static variable
static block
static method
constructors
instance variable
instance block
instance method

and same for super class if we instansiate a subclass's object.
What can we use as Constroctor's body?

thanks

[Sid Murrey]

package test;
import java.io.PrintStream;
 
class Major {
static { System.out.println("Superclass Static block");}
static PrintStream sps = System.out.append("Superclass Static field initialization\n");
PrintStream ps = System.out.append("Superclass field initialization\n");
{ System.out.println("Superclass Instance block"); }
public Major() { System.out.println("Superclass constructor"); }
}
 
public class Minor extends Major {
static { System.out.println("Subclass Static block"); }
static PrintStream sps = System.out.append("Subclass Static field initialization\n");
PrintStream ps = System.out.append("Subclass field initialization\n");
{ System.out.println("Subclass Instance block"); }
public Minor() { System.out.println("Subclass constructor"); }

public static void main(String[] args) {
new Minor();
}
}

When run, the following output is produced:

Superclass Static block
Superclass Static field initialization
Subclass Static block
Subclass Static field initialization
Superclass field initialization
Superclass Instance block
Superclass constructor
Subclass field initialization
Subclass Instance block
Subclass constructor

Local variables in static and non-static methods are of course only initialized when the method is called.
The order of execution of static blocks and static variable initialization is depending on the code, as far as I know!
[ July 23, 2008: Message edited by: Sid Murrey ]

[Joe Harry]

The best way if for you to simply try it for yourself!

[Raphael Rabadan]

Hello,

there is a interesting topic about it on the 2nd page, take a look at it: http://www.coderanch.com/t/269520/java-programmer-SCJP/certification/initialization-sequence