The process of java class initialization and object instantiation.

1. When is the class initialized?

• The class where the main() method is located must be initialized first
• The first time an object of this class is new, this class will be initialized
• If the subclass is initialized, the parent class must be initialized first

---

2. The class initialization process?
Initialization is actually to execute the <clinit> method. A class has only one <clinit> method.
The <clinit> method is the initialization statement of the static member variable and the statement in the static code block.

---

3. The object instantiation process?
The instantiation of an object actually executes the <init> method.
A class can have multiple <init> methods. An <init> method corresponds to a constructor.
The order of the statements in the <init> method is as follows.

1. The init of the parent class corresponds to super(), even if it is not written explicitly.
2. Initialization statements of non-static member variables and statements in non-static code blocks
3. Statement in the constructor