java中的静态代码块、构造代码块、构造方法详解

package com.test;

public class HelloB extends HelloA {
  
  public HelloB() {
  }

  {
    System.out.println("I'm B class");
  }
  
  static {
    System.out.println("static B");
  }

  public static void main(String[] args) {
    new HelloB();
  }
}

class HelloA {
  
  public HelloA() {
  }

  {
    System.out.println("I'm A class");
  }
  
  static {
    System.out.println("static A");
  }
  
}

static A
static B
I'm A class
I'm B class