12 应用举例

用类封装手机的基本属性和功能，要求手机既可以使用移动公司的SIM卡也可以使用联通公司SIM卡（可以使用任何公司提供的SIM卡）

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

public class SIMOfChinaUnicom extends SIM {
     String number;
     public void setNumber(String n){
         number=n;
     }
     public String giveNumber(){
         return number;
     }
     public String giveCorpName(){
         return "中国联通";
    }
}

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

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());
    }
}

public class Application {
    public static void main(String[] args) {
        MobileTelephone telephone=new MobileTelephone();
        SIM sim=new SIMOfChinaMobile();
        sim.setNumber("13856432");
        telephone.useSIM(sim);
        telephone.showMess();
        sim =new SIMOfChinaUnicom();
        sim.setNumber("1309765437");
        telephone.useSIM(sim);
        telephone.showMess();
        }

}

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