Order of Java static initializer, insance initializer and reference object's initializer

1. static initializer is run in the order from parent to child

2. instance initializers will be run the first thing after parent's instance initializers and code in constructor.

3. the refence class's static initializer will be called when the class is used. For example, the instance of it is created or the class's static method is called

 

 

public class Base {

    static {

       System.out.println("Base static");

    }

    {

       System.out.println("Base ");

    }

}

 

 

 

 

import com.test.Other;

 

public class Child extends Base{

    Other o ;

    static {

       System.out.println("Child static");

    }

    {

       System.out.println("Child ");

    }

   

    public static void main(String[] args) {

       System.out.println("Child main ");

       Other.printstatic();

       Child c = new Child();

       Other o = c.getOther();

       System.out.println(o.getI());

 

    }

    public Child(){

      

    }

    Other getOther(){

       System.out.println("Child getOther");

       o = new Other();

       return o;

    }

}

 

 

package com.test;

 

public class Other {

    static{

       System.out.println("Other static");

    }

    int i = 1;

    {

       System.out.println("Other");

    }

    public Other(){

       System.out.println("Other i="+i);

        i = 2;

        System.out.println("Other i="+i);

    }

    public int getI() {

       return i;

    }

    public void setI(int i) {

       this.i = i;

    }

    public static void printstatic() {

       System.out.println("Other printstatic");

    }

}

 

 

 

 

Output:

Base static

Child static

Child main

Other static

Other printstatic

Base

Child

Child getOther

Other

Other i=1

Other i=2

2