a few beginners questions ....

Hello, I am new to the java envoierment. I have several questions regarding
this language:

1. How about using class initializer ? When it is run ? If i include a class
from package, will it be also an initializer run for every class in that
package ?
2. I have problem with this code :

// FILE primer.java

import static narzedzia.LiczbyPierwsze ;

public class primer {

    public static void main(String[] args) {
        LiczbyPierwsze.main();
     // TODO, add your application code
     System.out.println("Hello World!");
    }
}

// FILE LiczbyPierwsze

package narzedzia;

public class LiczbyPierwsze {

protected final static long length = 21;

protected final static long sito [] = new long [1<<length];

public static void main(String[] args){
    int i;
    for (i=0;i<length;i++){
     System.out.println(sito[i] + "\n ");
     }
 }

public final static long czyPierwsza(long x ){
 return 0;
 }

public final static long naCzynnikiPierwsze(long x){
 return 0;
 }

}

//
When compiling this I've got: " cannot find symbol main".

3. Is the static public main() method a class initializer ? If so, suppose
we have code like that :

class Dummy{

static int i=3;
public static main(){
i=7;

}

public static get_i{
System.out.println(i);

}

}

and than if someone call Dummy.get(i) out of that class what would be the
output of the program. Yes i know i can run it myself, but could someone
explain me the result ? Is the line
static int i=3; regerded as a part of initializer ?