import java.util.*;
abstract  class  PhoneCard
{double balance;
 abstract boolean performDial();  //定义一个抽象方法performDial()，返回值是布尔类型
 double getBalance()
 {return balance;
 }
}
abstract class None_Number_PhoneCard extends PhoneCard
{String phoneSetType;
 String getSetType()
 {return phoneSetType;
 }
}
abstract  class  Number_PhoneCard extends PhoneCard
{long cardNumber;
 int password;
 String connectNumber;
 boolean connected;
 boolean performConnection(long cn,int pw)
 {if(cn == cardNumber && pw == password)
  {connected = true;
   return true;
  }
  else
   return false;
 }
}
class  IC_Card extends None_Number_PhoneCard
{boolean performDial()
 {if(balance>=0.5)
  {balance=balance-0.5;
   return true;
  }
  else
  {System.out.println("余额不足!请充值...");
   return false;
  }//重写方法，如果余额>=0.5,则在余额中减去0.5，否则显示余额不足。
 }
}
class  D201_Card extends Number_PhoneCard
{double  additoryFee;
 boolean performDial()
 {additoryFee=2.0;
  if(balance>=0.5+additoryFee)
  {balance=balance-(0.5+additoryFee);
   return true;
  }
  else
  {System.out.println("余额不足!请充值...");
   return false;
  }/*重写方法，如果余额>=(0.5 + additoryFee ),则在余额中减去(0.5 + additoryFee)，否则显示余额不足。*/
 }
}
public class TestExtends
{public static void main(String args[])
 {IC_Card ic_Card = new IC_Card();
  ic_Card.balance = 50.0;
  System.out.println("IC_Card 的余额："+ic_Card.getBalance());
  if(ic_Card.performDial())
  System.out.println("拨打电话后的余额"+ ic_Card.balance);
  D201_Card d201_Card=new D201_Card();
  d201_Card.balance=100.0;
  System.out.println("D201_Card 的余额："+d201_Card.getBalance());
  if(d201_Card.performDial())
  System.out.println("拨打电话后的余额："+d201_Card.balance);  
 }
}