java-关于static成员变量在jvm类加载时的执行过程

public class A{
    public static void main(String[] args) throws ClassNotFoundException {
        System.out.println(D.b);   //3
    }
}


class D{
    public  static int b=2;
    public static D d=new D();

    public D() {
        b++;
        System.out.println("构造执行了");
    }
}

public class A{
    public static void main(String[] args) throws ClassNotFoundException {
        System.out.println(D.b);     //2
    }
}


class D{
    public static D d=new D();
    public  static int b=2;

    public D() {
        b++;
        System.out.println("构造执行了");
    }
}

public class A{
    public static void main(String[] args) throws ClassNotFoundException {
        //System.out.println(D.a);  //对于调用final修饰静态常量，不会触发类的初始化操作，跟实例化没关系，因此static代码块不会执行
        System.out.println(D.b);  //没有final修饰的静态变量，会触发类的初始化操作，跟实例化没关系，因此static代码块会执行
    }
}



class D{
    public final static int a=1;
    public  static int b=2;

    public D() {
        System.out.println("构造执行了");
    }

    static {
        System.out.println("ddddddddddddd");
    }
    public static void d1(){
        System.out.println("d11111111111");
    }

    public final static void d2(){
        System.out.println("d2222222222222");
    }

}