Mars Teacher Java4android Interface instance

1. Create a printer interface

Interface printer{    publicvoid  open ();      Public void print (String s);      Public void close ();}

2. Create a Printerfactory class

 Public classprinterfactory{ Public StaticPrinter GetPrinter (intflag) {Printer Printer=NULL; if(flag = = 0) {Printer=NewHpprinter (); }Else if(Flag = = 1) {Printer=NewCanonprinter (); }Else if(Flag = = 2) {Printer=NewXxxprinter (); }        returnprinter; }}

3. Create a Hpprinter class

class Implements printer{    publicvoid  open () {        System.out.println ("Hpprinter Open") ;    }          Public void print (String s) {        System.out.println ("Hpprinter Print--->" + s);    }          Public void Close () {        System.out.println ("Hpprinter close");}    }

4. Create a Canonprinter class

classCanonprinterImplementsprinter{Private voidClean () {System.out.println ("Canonprinter Clean"); }         Public voidClose () { This. Clean (); System.out.println ("Canonprinter Close"); }         Public voidOpen () {System.out.println ("Canonprinter Open"); }         Public voidprint (String s) {System.out.println ("Canonprinter Print--->" +s); }}

5. Create a Xxxprinter class

 Public class Implements printer{    publicvoid  open () {        System.out.println ("Xxxprinter Open"  );    }          Public void print (String s) {        System.out.println ("Xxxprinter Print--->" + s);    }          Public void Close () {        System.out.println ("Xxxprinter close");}    }

6. Create the test class

 Public class test{    publicstaticvoid  main (String args[]) {        int Flag = 2;                 = printerfactory.getprinter (flag);                Printer.open ();        Printer.print ("test");        Printer.close ();    }}

Mars Teacher Java4android Interface instance