Java-SIM卡

Application类

public class Application {public static void main(String[] args) {MobileTelephone telephone=new MobileTelephone();SIM sim=new SIMOfChinaMobile();sim.setNumber("1388765432");telephone.useSIM(sim);telephone.showMess();sim=new SIMOfChinaUnicom();sim.setNumber("13097656437");telephone.useSIM(sim);telephone.showMess();}}

 

MobileTelephone类

public class MobileTelephone { SIM card; public void useSIM(SIM card){  this.card=card; } public void showMess(){  System.out.println("使用的卡是:"+card.giveCorpName()+"提供的");  System.out.println("手机号码是:"+card.giveNumber()); }}

 

 

SIM类

public abstract class SIM { public abstract void setNumber(String n); public abstract String giveNumber(); public abstract String giveCorpName();}

 

SIMOfChinaMobile类

 

public class SIMOfChinaMobile extends SIM { String number; public String giveCorpName() {  return "中国移动"; } public String giveNumber() {  return number; } public void setNumber(String n) {  number=n; }}

 

 

SIMOfChinaUnicom类