Java code block and constructor execution sequence

The code block here refers to the code block enclosed by {}, which is independent of the method body, including static code blocks and non-static code blocks. For example:

 

Class {

Static int x = 0; // static attribute

Int y = 1; // non-static attribute

Static {

// Static code block

}

 

{

// Non-static code block

}

 

Public (){

// Constructor

}

 

Public static void main (string [] ARGs ){

A class1; // load the class

A = new A (); // instantiate and create an object

}

}

 

The execution sequence can be summarized as follows:

 

1. Static attributes and static statement blocks are all completed during class loading, and non-static objects are executed during object creation.

2. the initialization sequence of a single class is as follows:
Allocate and assign values to static attributes-> execute static code blocks-> allocate memory for non-static attributes and assign values-> execute non-static code blocks-> constructor.

3. the initialization sequence of the inherited classes is as follows:
Parent static-> parent static block-> child static block-> parent non static block-> parent structure-> child non static-> sub-non-static blocks-> sub-structures.

 

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