static block,non-static block, & constructor issue

[Mark Henryson]

public class Q20
{
  static int i;
  int j;
  
  static
  {
     System.out.print("("+i+")");
     i=3;
     System.out.print("("+i+")");
  }
 
  {
     System.out.print("("+i+","+j+")");
     j = 2;
     System.out.print("("+i+","+j+")");
  }
 
  Q20()
  {
     System.out.print("("+i+","+j+")");
  }
 
  public static void main(String args[])
  {
     System.out.print("("+i+")");
     Q20 q = new Q20();
     System.out.print("("+q.i+","+q.j+")");
  }
}         

In the above code:
First the static block will run: (0)(3)
Then the main method will run : (3)
Then the constructor will run : (3,0)

Then whether non-static block
will run or main method's q.i
and q.j will run???

Suppose if main methods q.i &
q.j runs first, then : (3,0)

Then non-static block : (3,0)(3,2)
--------------------------------------------------------------
so final answer for me:[B](0)(3)(3)(3,0)(3,0)(3,0)(3,2)

Even if the non-static block runs before the main methods q.i and q.j, the output should be: (0)(3)(3)(3,0)(3,0)(3,2)(3,2)

But the output of the pgm is (0)(3)(3)(3,0)(3,2)(3,2)(3,2) how???

[Jesus Angeles]

Originally posted by Mark Henryson:

public class Q20
{
  static int i;
  int j;
  
  static
  {
     System.out.print("("+i+")");
     i=3;
     System.out.print("("+i+")");
  }
 
  {   
     System.out.print("("+i+","+j+")");
     j = 2;
     System.out.print("("+i+","+j+")");
  }
 
  Q20()
  {
     System.out.print("("+i+","+j+")");
  }
 
  public static void main(String args[])
  {
     System.out.print("("+i+")");
     Q20 q = new Q20();
     System.out.print("("+q.i+","+q.j+")");
  }
}         

In the above code:
First the static block will run: (0)(3)
Then the main method will run : (3)
Then the constructor will run : (3,0)

Then whether non-static block
will run or main method's q.i
and q.j will run???

Suppose if main methods q.i &
q.j runs first, then : (3,0)

Then non-static block : (3,0)(3,2)
--------------------------------------------------------------
so final answer for me:[B](0)(3)(3)(3,0)(3,0)(3,0)(3,2)

Even if the non-static block runs before the main methods q.i and q.j, the output should be: (0)(3)(3)(3,0)(3,0)(3,2)(3,2)

But the output of the pgm is (0)(3)(3)(3,0)(3,2)(3,2)(3,2) how???

1>>>first, static block is executed giving:
(0)(3)
2>>>then, 'System.out.print("("+i+")");' giving:
(3)
3>>>then, the non-static initialization block
{
System.out.print("("+i+","+j+")");
j = 2;
System.out.print("("+i+","+j+")");
}
giving:
(3,0)(3,2)
4>>>then, the constructor method is executed: giving:
(3,2)
5>>>then 'System.out.print("("+q.i+","+q.j+")");' giving:
(3,2)

[Jesus Angeles]

when you try to use static stuff, then java makes sure it is there, the static things, without the object itself,... so it does the static initializations. after then, it executes your static requests.

the when you try to call the constructor, it first executes non-static blocks, then calls the constructor

[Hentay Duke]

This much clearer than testing with all those variables.

public class Q20 {  
static int i;  
int j;    
static  {     
System.out.println("static block");     
}   
{ 
System.out.println("non static block"); 
}   

public Q20()  {     
System.out.println("constructor");  
}   

public static void main(String args[])  {     
Q20 q = new Q20();     
System.out.println("sysout in main method");  
}
}