Nested Clases

public class Nestclasses {

a obj=new a();
public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println("hellwo in main class");
    a.main(args);
}

static class a{

   Outer onnn=new Outer();
   Outer.innner oon=onnn.new innner();  

    public static void main(String[] args){
        int i=1;
        String ch="ha";
        System.out.println("hellwo in nested class"+i+ch);
    }

}

}

class Outer{ void method3(){ double b=52565.55; } class innner{ innner(){ System.out.println("values:sdfsdfs"); } } }

/*Q:-Here I innner Class Constructor but its not call why i make a instance of that innner class at the beginning of the Nestclasses */