Java class Execution order issues

Frequently encountered face questions, one class inherits another class and then asks what the result of the output is. Personal feel is the test class output problem (pro-Test)

First: A single class execution order

Package Test;

public class Person {

static{
System.out.println ("Static block of the parent class");
}

Person () {
System.out.println ("Construction method of the parent class");
}

{
SYSTEM.OUT.PRINTLN ("Non-static code block of the parent class");
}



public static void Main (string[] args) {
System.out.println ("main function of the parent class main");
Person p = new person ();
}

}

Print:

Static block of parent class
Main function of parent class main
Non-static block of code for the parent class
How to construct a parent class

The output is: static block of parent class----the parent class's main function main--> the non-static block of the parent class--the constructor of the parent class

Second: Subclass inherits parent class, creates subclass object, order of code Execution (pro-Test)

Package Test;

public class Sontest extends person {
static{
System.out.println ("Static code block for subclasses");
}
{
SYSTEM.OUT.PRINTLN ("Non-static block of code for subclasses");
}
Sontest () {
System.out.println ("constructor of the subclass");
}
public static void Main (string[] args) {
System.out.println ("Main function of the subclass main");
Sontest s = new Sontest ();
}
}

Print:

Static block of parent class
Static code blocks for subclasses
The main function of the subclass main
Non-static block of code for the parent class
How to construct a parent class
Non-static blocks of code for subclasses
Constructors for subclasses

The output is the static code block of the parent class----The static code block of the subclass--the main function of the subclass--main--> The parent class non-static code block--the constructor of the parent class--The non-static code block of the subclass--the constructor of the child class

Java class Execution order issues