Java Object-oriented programming (III)--this

Look at a piece of code: (Demo112.java), first understand why you want to use this.

/*the necessity of this*/ Public classdemo112{ Public Static voidMain (String []args) {Dog dog1=NewDog (2, "rhubarb"); Person P1=NewPerson (dog1,23, "just son"); Person P2=NewPerson (dog1,24, "Dragons");            P1.showinfo ();    P1.dog.showInfo (); }}//Define a humanclassperson{//member Variables    intAge ;    String name; Dog Dog; // Reference type 

// Human tectonic functions     Public Person (dog dog,int  age,string name) {        //This writing is poorly readable and does not know which of the two age refers to the parameter list, which refers to the member variable.          // age=age;         // Name=name;

//introduce this to point to the current object.          This. age=age;//this.age Specifies the member variable age         This. name=name;//this.name Specifies the member variable name         This. dog=Dog; }    //Show person Name     Public voidShowinfo () {System.out.println ("Name is:" + This. Name); }}classdog{intAge ;    String name;  PublicDog (intage,string name) {         This. age=Age ;  This. name=name; }    //Show Dog name     Public voidShowinfo () {System.out.println ("Dog name" + This. Name); }}

The

shows from the case that introducing thsi is necessary. This is an object that is not part of a class, but it cannot be used outside of the class definition and can only be used in methods defined by the class . The Java virtual Opportunity assigns this to each object, representing the current object.