The idea of Java oriented abstract programming

Sim.java

 Public Abstract class SIM {    publicabstractvoid  Setnumber (String n);      Public Abstract String Givenumber ();      Public Abstract String givecorpname ();}

Mobiletelephone.java

 Public class Mobiletelephone {   SIM card;     Public void Usesim (SIM card) {      this. card=card;   }      Public void showmess () {      System.out.println ("card used is:" +card.givecorpname () + "provided");      System.out.println ("mobile phone number is:" +Card.givenumber ());}   }

Simofchinamobile.java

 Public class extends SIM {    String number;      Public void Setnumber (String N) {        = n;    }      Public String Givenumber () {        return number ;    }       Public String Givecorpname () {        return "China Mobile";    }}

Simofchinaunicom.java

 Public class extends SIM {    String number;      Public void Setnumber (String N) {        = n;    }      Public String Givenumber () {        return number ;    }      Public String Givecorpname () {        return "China Unicom";    }}

Application.java

 Public class Application {   publicstaticvoid  main (String args[]) {      new  Mobiletelephone ();      Sim Sim=new  simofchinamobile ();      Sim.setnumber ("13887656432");      Telephone.usesim (SIM);      Telephone.showmess ();      Sim=new  simofchinaunicom ();      Sim.setnumber ("13097656437");      Telephone.usesim (SIM);      Telephone.showmess ();   }}

The idea of Java oriented abstract programming