static block

about static block
I write two class like this:
one is:

package test.prejspload;

public class StaticBlock
{
    public StaticBlock(){
   
    }

    static{
        System.out.println("this is static block");
    }

    public static void main(String[] args){
        System.out.println("this is main");
    }
}

another is :

package test;

import test.prejspload.StaticBlock;

public class StaticBlock2{
    public static void main(String[] args){
        StaticBlock b1 = new StaticBlock(); // mask or not
        System.out.println("static block 2");
       
        try {
            Class staticClass = Class.forName("test.prejspload.StaticBlock");
            } catch (ClassNotFoundException e) {
            e.printStackTrace();
            }

    }
}

if mask the red line, StaticBlock2's result is :
static block 2
this is static block

if do not mask the red line, StaticBlock2's result is :
this is static block
static block 2

now, we can see that main block would be executed when initialize it's class.
at first, i think, maybe when 'import', static block has been exec,
actually, it's not.
just when initialize.