求：编写一个java应用程序

import javaio;

abstract class PhoneCard
{
int balance = 3000;

int getbalance()
{
return balance;
}

abstract void Call() throws IOException;
}

abstract class None_Number_PhoneCard extends PhoneCard
{
String type = "无号码电话卡";

String gettype()
{
return type;
}
}

class magCard extends None_Number_PhoneCard
{
String area;

void Call() throws IOException
{
BufferedReader buf = new BufferedReader(new InputStreamReader(Systemin));
String s;
long start, end;
int cost;

while (true)
{
if (60 <= thisgetbalance())
{
Systemoutprint("请输入你要呼叫的号码(挂机请直接按回车键）:");
s = bufreadLine();

if (sequals(""))
{
break;
}

Systemoutprint("接通中，请稍后");
for (int i = 0; i <= 6; i++)
{
for (int j = 1; j <= 100000000; j++)
{
if (j % 10000000 == 0)
Systemoutprint('');
}
for (int j = 1; j <= 10; j++)
{
Systemoutprint('\b');
}
Systemoutprint(" ");
for (int j = 1; j <= 10; j++)
{
Systemoutprint('\b');
}
}
for (int i = 1; i <= 14; i++)
{
Systemoutprint('\b');
}

Systemoutprint("电话接通，开始计时（按回车键结束本次通话）:");
start = SystemcurrentTimeMillis();
s = bufreadLine();
end = SystemcurrentTimeMillis();
Systemoutprintln("本次通话时间：" + (end - start) / 60000 + "分" + (((end - start) / 1000) % 60) + "秒");
cost = (int)((end - start + 59999) / 60000) 60;
Systemoutprintln("本次通话费用：" + cost / 100 + "" + cost % 100);
thisbalance -= cost;
Systemoutprintln("当前卡内余额：" + thisbalance / 100 + "" + thisbalance % 100);
Systemoutprintln("\n");
}
else
{
Systemoutprintln("当前余额不足，请换卡……");
break;
}

}
}
}

public class test8
{
public static void main(String[] args)
{
magCard a = new magCard();

Systemoutprintln("");
Systemoutprintln("你正使用的是" + atype);
Systemoutprintln("本卡仅限于区号" + aarea + "范围内使用");
Systemoutprintln("当前卡内余额：" + agetbalance() / 100 + "" + agetbalance() % 100);
Systemoutprintln("");

try
{
aCall();
}
catch (IOException e)
{
eprintStackTrace();
}
}
}

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