Brother Lian Blockchain technology training sharing the object-oriented summary of Go language

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Type $name struct{

PROPERTY01 int

property02 int

}

The methods and interfaces inside the Golang are based on the type created by this type of struct here, which can actually be understood as:

Class $name {

public int property01;

public int property02;

}

A type is a class.

So we're talking about a type of method that implements an interface.

A type is a collection of properties, an interface is a collection of methods

function definition: Func $funcName () () {}

Definition of the method: Func () $funcName () () {}

Func (member variable type) funname (local variable type, local variable type) (return value type) {}

Member variables are defined by type.

The argument list for a function is a local variable that needs to be passed.

The type signature of the Golang method:

1. Indicate which type to add the method to;

2. Specify whether the variable calling this method is a value type or a pointer type, and the variable calling this method must be signed by Type here to decide whether to use a value type or a pointer type, Golang can automatically convert, but you must ensure that the variable can be correctly converted to the corresponding value or pointer. For example, a variable of an interface type cannot be converted to a pointer to a struct.

Inherited:

When the type of a field (anonymous field) of type B is another type A, all the fields owned by type A are implicitly introduced to the currently defined type B. This implements the inheritance. A variable of type B can call all properties and methods of a. In other words, a inherits B.

When defining inheritance, a subclass typically contains an anonymous field with a type that is the parent class. An anonymous field is used to implement inheritance.

Package Main

Import (

"FMT"

)

Type Animal struct {

Name string

Age int

}

Func (Ani *animal) getage () int {

return ANI. Age

}

Type Dog struct {

Animal//animal Anonymous Field

}

Func Main () {

Dog: = dog{animal{"Dog", 10}}

Fmt. Println (dog. Age)

Fmt. Println (dog. Getage ())

}

Override of Method

If a type B implements the method in type a as its property. Then the value of this type B calls the method of its own type B, rather than the method of the property type A.

The code is as follows:

Package Main

Import (

"FMT"

)

Type Animal struct {

Name string

Age int

}

Func (Ani *animal) getage () int {

return ANI. Age

}

Type Dog struct {

Animal//animal Anonymous Field

}

Func (Ani Dog) getage () int {

return ANI. Age + 1

}

Func Main () {

Dog: = dog{animal{"Dog", 10}}

Fmt. Println (dog. Age)

Fmt. Println (dog. Getage ())

}

Interface

1 interface

1) Define the interface type

Defines an interface in which an unassigned method can be implemented.

Type Animal Interface {

Getage () int

}

1) Implementing the interface type

If a type implements all methods of an interface. This interface is implemented by this type.

Type Animal Interface {

Getage () int

}

Type Dog struct {

Name string

Age int

}

Implement the Getage () square rule to implement the animal interface

Func (Ani Dog) getage () int {

return ANI. Age

}

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