메소드 + 은행계좌 관리

// 메소드

public class Account {
private String accountNumber; //계좌번호
private String owner;   //계좌 소유주
private long balance;   //잔액

//생성자
public Account(String accountNumber, String owner) {
this.accountNumber = accountNumber;
this.owner = owner;
balance = 0L;
}

public Account() {
this.accountNumber = null;
this.owner = null;
balance = 0L;
}

//입금함
public void deposit(int money) {
balance += money;
}

//출금함
//반환값 : 정상(0), 실패(-1)
public int withdraw(int money) {
if(balance >= money) {
balance -= money;
return 0;
}
return -1;

}
//계좌정보 출력
public void print() {
System.out.println("계좌번호 : " + accountNumber);
System.out.println("고객명 : " + owner + "님");
System.out.println("잔액 : " + balance +"원");
}

public void setAccountNumber(String accountNumber) {  //셋터
this.accountNumber = accountNumber;
}
public void setOwner(String owner) {
this.owner = owner;
}

public String getAccountNumber() {  //겟터
return this.accountNumber;
}
public String getOwner() {
return this.owner;
}
}

//메인 함수

import java.util.Scanner;

public class Accounttest {

public static void main(String[] args) {
//필요한 변수
int balanceMoney = 0;
int withdrawMoney = 0;
int n;
Account account = new Account();


boolean loop_flag = true;
Scanner sc = new Scanner(System.in);



  do {
   System.out.println("");
   System.out.println("1)계좌번호 설정");
   System.out.println("2)고객명 설정");
   System.out.println("3)입금");
   System.out.println("4)출금");
   System.out.println("5)계좌정보 출력");
   System.out.println("6)종료");
   System.out.print("입력 : ");
   n = sc.nextInt();
 
   switch(n) {
    case 1 : {
    System.out.print("계좌번호 : ");
    String accountNo = sc.next();
    account.setAccountNumber(accountNo);
    break;
    }
    case 2 : {
    System.out.print("고객명 : ");
    String ownerName = sc.next();
    account.setOwner(ownerName);
    break;
    }
    case 3 : {
    System.out.print("입금액 : ");
    balanceMoney = sc.nextInt();
    account.deposit(balanceMoney);
    break;
    }
    case 4 :{
    System.out.print("출금액 : ");
    withdrawMoney = sc.nextInt();
    if(account.withdraw(withdrawMoney) == 0) {
System.out.println("출금성공");
}
else {
System.out.println("잔액부족");
}
    break;

    }
    case 5 : {
    account.print();
    break;
    }
    case 6 : {
    System.out.println("종료하였습니다.");
    loop_flag = false;
        break;
    }
    default : System.out.println("잘못입력 하셨습니다.");
   }
  } while (loop_flag == true);
  sc.close();
}
}