A code block is constructed in the child parent class in the code static block. Code block constructor member variable instance variable execution order

It's not easy to get it straight when it starts to touch. to create a subclass or polymorphic condition:/* When creating subclasses: 1. Parent class static code block 2. Subclass static code block 3. The parent class constructs a block/instance variable (a member of a variable created by new)//WHO executes before executing the constructor 4. Parent class Constructors//parent class constructors have methods , the parent class method is not executed if the method subclass has a method that executes the subclass. //If the subclass has a parent class that does not have an error!//parent class Private The method executes the parent class method5. Subclass constructs block/instance variable//WHO executes the constructor 6 after execution. Subclass Constructor 7. Subclass Normal Method//Call member variable, look at the value of the subclass, no longer look at the value of the parent Class 8. The child class member variable//does not call the value of the parent Class 9. Normal method Output result

Class a{      int m=1;    {System.out.println ("111");}　　　　　　　　1-->111    A () {        speak ();//4--> directly executes the subclass method 5    }    c c = new C (); 2-->    {System.out.println ("222");}    void Speak () {        System.out.println ("a");}    }　　　　　　　　　　Class c{    C () {        System.out.println ("C");//3-->c                                //7-->c    }}class B extends a{    int m = 5; 10-->    {System.out.println ("333");}    B () {        System.out.println ("B");//8-->b    }    c c = new C (); 6-->    void Speak () {        System.out.println (m);//5-->0                              //9-->                              //11-->5    }    {System.out.println ("444");}    public static void Main (string[] args) {        b b = new B ();        B.speak ();    }}

The comments are followed by the execution order and output results.

A code block is constructed in the child parent class in the code static block. Code block constructor member variable instance variable execution order