Java basics-1. Basic syntax, java-1 basic syntax

Java basics-1. Basic syntax, java-1 basic syntax
1 variable assignment and method call 1.1 assign values to private member variables

Source: private variables cannot be directly modified. Extended Methods

 

 

1.2 call Methods

 

1.3 Supplement 1: transition object-Interface

 

 

2. Call Sequence

Class loading, object creation, method calling

Static à object (constructor à general method) à local variable

 

3. code block, 3.1 Priority

 

 

3.2 three types of code blocks

 

3.2.1 construct a code block

Construct a code block: Initialize all objects in a unified manner.

2: Role

1: Initialize the object. The object runs as soon as it is created and takes precedence over the constructor.

2: differences from Constructors

1: The difference between the Construction Code block and the construction function. The construction code block initializes all objects in a unified manner, and the construction function initializes the corresponding objects.

2: Construct a code block: It extracts public information from all constructor methods.

 

 

3.2.2 static code block

1. The static code block cannot exist in any method.

2 static code blocks cannot directly access static instance variables and static instance methods. They must be accessed through instance objects of the class.

 

 

 

 

 

 

 

 

 

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