13-from scratch to JavaWeb-complete interpretation of member variables and local variables, 13-javaweb-

13-from scratch to JavaWeb-complete interpretation of member variables and local variables, 13-javaweb-

Tutorial video:

1. Variable Division

2. member variables and local variables

3. Scope and lifecycle of Variables

I. variable definition

Data type variable name = value;

Ii. Variable Classification

Variables can be divided into two types based on their defined locations:

1. member variables: variables directly defined in the class

2. Local variables: variables defined in methods or code blocks

 

Iii. Variable Initialization

Variables are initialized to open up space in the memory.

One member variable has a default value and the other has no default value.

Member variables can be used directly.

If you do not set an initial value for a local variable, an error is reported if you use it directly.

Iv. variable scope

The range that can be used after the variables are defined

V. Variable Lifecycle

Vi. Notes on variables

 

 

Follow the following code: "Xiaoqiang code"

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