testoverride.java

有大量的java的实例

public class TestOverride
{
public static void main(String args[])
{
	D200_Card my200 = new D200_Card(12345678,1234,50.0,"200");
	if(my200.performDial(12345678,1234))
		System.out.println("拨打电话后剩余金额为："+my200.getBalance());
	if(my200.performDial())
		System.out.println("拨打电话后剩余金额为："+my200.getBalance());
}
}
abstract  class  PhoneCard
{
	double balance;

	abstract boolean performDial();
	double getBalance()
	{
		return balance;
	}
}
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  D200_Card extends Number_PhoneCard
{
	double  additoryFee;
	
	D200_Card(long cn,int pw,double b,String c)
	{
		cardNumber = cn;
		password = pw;
		balance = b;
		connectNumber = c;
	}
	boolean performDial()
	{
		if(!connected)
			return false;
		if( balance > (0.5 + additoryFee ))
		{
			balance -= (0.5 + additoryFee);
			return true;
		}
		else
			return false;
	}
	boolean performDial(long cn,int pass)
	{
		if(performConnection(cn,pass))
			return performDial();
		else
			return false;
	}
	double getBalance()
	{
		if(connected)
			return balance;
		else
			return -1;
	}
}