testabstract.java

有大量的java的实例

public class TestAbstract
{
public static void main(String args[])
{
	PhoneCard200 my200 = new PhoneCard200(50.0);
	IC_Card myIC = new IC_Card(50.0);
	System.out.println("200卡可以拨打 "+my200.TimeLeft()+" 次电话。");
	System.out.println("IC 卡可以拨打 "+myIC.TimeLeft()+" 次电话。");
}
}
abstract class PhoneCard
{
	double balance;
	abstract void performDial();
	double TimeLeft()
	{
		double current = balance;
		int times = 0;
		do
		{
			performDial();
			times++;
		}while(balance>=0);
		balance = current;
		return times-1;
	}
}
class PhoneCard200 extends PhoneCard
{
	static  long  nextCardNumber;
	static  final String  connectNumber = "200";
	static  double  additoryFee;
	long  cardNumber ;
	int  password;
	boolean connected;

	static
	{
		nextCardNumber = 2001800001;
		additoryFee = 0.1;
	}
	PhoneCard200(double ib)
	{
		cardNumber = nextCardNumber++;
		balance = ib;
	}
	void performDial()
	{
		balance -= 0.5+additoryFee;
	}
}
class IC_Card extends PhoneCard
{
	IC_Card(double ib)
	{
		balance = ib;
	}
	void performDial()
	{
		balance -= 0.9;
	}
}