Java Internal classes

1. Static Nesting Classes

 PackageCom.wangfeng;Importjava.util.ArrayList; Public classOuter { Public Static classinner{PrivateString name;  PublicInner (String name) { This. Name =name; }         PublicString GetName () {returnname; }         Public voidsetName (String name) { This. Name =name; }            }         Public BooleanAddMembers (Inner member) { This. Members.add (member); return true; }         Public voidprintmembers () { for(Inner Member: This. Members)        {System.out.println (Member.getname ()); }    }        PrivateArraylist<inner> Members =NewArraylist<>();  PublicArraylist<inner>getMembers () {returnMembers ; }     Public voidSetmembers (arraylist<inner>Members ) {         This. Members =Members ; }}

The main thing is that the inner class has static in front

If such a class is externally visible, it can be initialized in the following way:

Outer.Inner in = new Outer.Inner ("wangfeng2");

2. Inner class

Import Java.util.arraylist;public class Outer {public class inner{private string Name;public Inner (string name) { THIS.name = name;} Public String GetName () {return name;} public void SetName (String name) {this.name = name;}} public Boolean addmembers (Inner member) {This.members.add (member); return true;} public void Printmembers () {for (Inner member:this.members) {System.out.println (Member.getname ());}} Private arraylist<inner> members = new arraylist<> ();p ublic arraylist<inner> getMembers () {return Members;} public void Setmembers (Arraylist<inner> members) {this.members = members;}}

　

The main thing is that the inner class has no static

If such a class is externally visible, it can be initialized in the following way:

Outer.Inner in = out . New Inner ("wangfeng2");

3. Local inner class (that is, the class defined in the method)

Public interface People {string getName (); void SetName (string name);}

　　

public class Hello {public static void main (string[] args) {people p = peoplefactory ();p. SetName ("ADFASD"); System.out.println (P.getname ());} public static People Peoplefactory () {class man implements people{string Name;public String GetName () {return name;} public void SetName (String name) {this.name = name;}} return new Man ();}}

　

4. Anonymous inner class

public class Hello {public static void main (string[] args) {people p = peoplefactoryanonymous ();p. SetName ("ADFASD"); System.out.println (P.getname ());} public static People Peoplefactory () {class man implements people{string Name;public String GetName () {return name;} public void SetName (String name) {this.name = name;}} return new Man (); public static People peoplefactoryanonymous () {return new people () {string Name;public string GetName () {return name;} public void SetName (String name) {this.name = name;}};}}

　　

　

Java Internal classes