How do you use NULL parameter construction methods in Java to automatically generate objects of different names, what is the difference between using non-static properties and static properties, and why? How to understand the static keyword

Non-static properties are used when NULL parameter constructs automatically generate objects

Code:

 PackageCom.swift;//automatic generation of objects using the parameterless construction method, the serial number is continuously self-increasing Public classPerson {Private intCount//If you are using a non-static property when defining a class, the result is the same, which is 1. Because this count life cycle is short, only inside the object     Public intID;  PublicString name;  Public intAge ;  PublicString City;  PublicPerson () {Super(); Count++;  This. id=count;  This. Name= "noname-" +count;  This. age=20;  This. city= "Shu" +count; }     PublicPerson (intID, String name,intage,string City) {         This. id=ID;  This. name=name;  This. age=Age ;  This. city=City ; }     Public intgetId () {returnID; }     Public voidSetId (intID) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     Public intGetage () {returnAge ; }     Public voidSetage (intAge ) {         This. Age =Age ; }     PublicString getcity () {returnCity ; }     Public voidsetcity (String city) { This. City =City ; }     PublicString GetInfo () {return"The person was id=" + ID + ", name=" + name + ", age=" + Age + ", city=" +City ; }    }

Results:

Use static properties when NULL parameter constructs automatically generate objects

Code:

 PackageCom.swift;//automatic generation of objects using the parameterless construction method, the serial number is continuously self-increasing Public classPerson {Private Static intCount//If you are using static properties when defining a class, you will get a different result. Count life cycle long, same as class     Public intID;  PublicString name;  Public intAge ;  PublicString City;  PublicPerson () {Super(); Count++;  This. id=count;  This. Name= "NoName" +count;  This. age=20;  This. city= "Shu"; }     PublicPerson (intID, String name,intage,string City) {         This. id=ID;  This. name=name;  This. age=Age ;  This. city=City ; }     Public intgetId () {returnID; }     Public voidSetId (intID) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     Public intGetage () {returnAge ; }     Public voidSetage (intAge ) {         This. Age =Age ; }     PublicString getcity () {returnCity ; }     Public voidsetcity (String city) { This. City =City ; }     PublicString GetInfo () {return"The person was id=" + ID + ", name=" + name + ", age=" + Age + ", city=" +City ; }    }

Results:

How do you use NULL parameter construction methods in Java to automatically generate objects of different names, what is the difference between using non-static properties and static properties, and why? How to understand the static keyword