낡은 노트

SimpleDateFormat mSimpleDateFormat = new SimpleDateFormat ( "yyyy.MM.dd HH:mm:ss", Locale.KOREA );
Date currentTime = new Date ( );
String mTime = mSimpleDateFormat.format ( currentTime );
System.out.println ( mTime );

public class Account {

String accountNo;

String ownerName;

int balance;

void deposit(int amount){

balance += amount;

}

int withdraw(int amount) throws Exception{

if(balance < amount)

throw new Exception("잔액이 부족 합니다.");

balance -= amount;

return amount;

}

}

public class Account {

String accountNo;

String ownerName;

int balance;

void deposit(int amount){

balance += amount;

}

int withdraw(int amount) throws Exception{

if(balance < amount)

throw new Exception("잔액이 부족 합니다.");

balance -= amount;

return amount;

}

}

class CheckingAccount extends Account{

String cardNo;

int pay(String cardNo, int amount) throws Exception{

if(!cardNo.equals(this.cardNo) || (balance < amount))

throw new Exception("지불이 불가능합니다");

return withdraw(amount);

}

}

class Exam {

public static void main(String ar[]){

CheckingAccount obj = new CheckingAccount();

obj.accountNo = "111-111-111111";

obj.ownerName = "송동수";

obj.cardNo = "1111-2222-1111-2222";

obj.deposit(1000000);

try{

int paidAmount = obj.pay("1111-2222-1111-2222", 890000);

System.out.println("지불액 : "+paidAmount);

System.out.println("액 : "+obj.balance);

}catch(Exception e){

}

}

}
 

지불액 : 890000

액 : 110000  이렇게 말이다. 만약 잔액보다 많은 금액을 넣는다면 직불이 불가능하다고 뜬다,

class CheckingAccount extends Account{

String cardNo;

CheckingAccount(String accountNo, String ownerName, 

int balance, String cardNo){

this.accountNo = accountNo;

this.ownerName = ownerName;

this.balance = balance;

this.cardNo = cardNo;

}

int pay(String cardNo, int amount) throws Exception{

if(!cardNo.equals(this.cardNo) || (balance < amount))

throw new Exception("지불이 불가능합니다");

return withdraw(amount);

}

}

class Exam {

public static void main(String ar[]){

CheckingAccount obj = new CheckingAccount("111-111-111111",
 "송동수", 0 "1111-2222-1111-2222");

obj.deposit(1000000);

try{

int paidAmount = obj.pay("1111-2222-1111-2222", 890000);

System.out.println("지불액 : "+paidAmount);

System.out.println("액 : "+obj.balance);

}catch(Exception e){

String msg= e.getMessage();

System.out.println(msg);

}

}

}