[KOSTA] Spring 기반 Cloud 11일차 - OOP 실습(Class Diagram 분석하기)

🎲 class diagram과 주어진 BankSystem.java 를 이용해 입출금 프로그램 구현하기

📃 풀이

BankSystem.java

package kosta.bank;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class BankSystem {
	private MyBank myBank;		//MyBank 
	
	public BankSystem(){	
		myBank = new MyBank();
		showMenu();
	}
	
	public void showMenu(){		//show method 만들기
		String  menu = null;			
		String id = null;
		String name = null;
		long balance = 0;
		
		do{
		
			System.out.println("****메뉴를 입력하세요****");
			System.out.println("1. 고객등록");
			System.out.println("2. 고객보기(1명)");
			System.out.println("3. 고객전체보기");
			System.out.println("4. 고객예금출금");
			System.out.println("5. 고객예금입금");
			System.out.println("***끝내기***");
			System.out.println("***************");
			System.out.print(">>");			
			
			menu = readFromKeyboard();			
		
			if(menu.equals("1")){				//고객등록
				
				System.out.print("ID를 입력하세요: ");
				id = readFromKeyboard();
				
				System.out.print("이름을 입력하세요: ");
				name = readFromKeyboard();
				
				System.out.print("잔고를 입력하세요: ");
				balance = Long.parseLong(readFromKeyboard());
				
				myBank.addCustomer(id, name, balance);
				
			}
			else if(menu.equals("2")){
				System.out.print("고객ID를 입력하세요: ");
				id = readFromKeyboard();
				Customer cust = myBank.getCustomer(id);
				System.out.println(cust.getId() +":" + cust.getName() + ": "
						+ cust.getAccount().getBalance());	
			
			}
			else if(menu.equals("3")){
				
				Customer[] allCust = myBank.getAllCustomers();
				
				for(int i=0;i<allCust.length;i++){
					System.out.println(allCust[i].getId() + ": " +
													allCust[i].getName() + " :" +
													allCust[i].getAccount().getBalance());
				}
				
			}
			else if(menu.equals("4")){
				
				System.out.print("고객의 ID를 입력하세요.: ");
				id = readFromKeyboard();
				
				Customer cust = myBank.getCustomer(id);
				
				if(cust == null){
					System.out.println("등록된 고객이 아닙니다.");
				
				}else{
					System.out.print("출금액을 입력하세요: ");
					balance = Long.parseLong(readFromKeyboard());
					
					if(cust.getAccount().withdraw(balance)){
						System.out.println("정상적으로 출금되었습니다.");
						System.out.println("출금후 잔고는 :" + cust.getAccount().getBalance());
					}else{
						System.out.println("잔고가 부족합니다.");
					}
				}
				
			}
			else if(menu.equals("5")) {
				
				System.out.print("고객의 ID를 입력하세요. : ");
				id = readFromKeyboard();
				
				Customer cust = myBank.getCustomer(id);
				
				if(cust == null) {
					System.out.println("등록된 고객이 아닙니다.");
				}else {
					System.out.print("입금액을 입력하세요 : ");
					balance = Long.parseLong(readFromKeyboard());
					
					cust.getAccount().deposit(balance); 
					System.out.println("정상적으로 입금되었습니다.");
					System.out.println("입금후 잔고는 : " + cust.getAccount().getBalance());
					
				}
			}
			
			
		}while(!menu.equals("q"));
	}
	


	public String readFromKeyboard(){
		String input = null;
		try{
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			input = br.readLine();
		}catch(Exception e){
			System.out.println(e.getMessage());
		}
		return input;
	}
	
	public static void main(String[] args) {
		BankSystem bank = new BankSystem();

	}

}

Account.java

package kosta.bank;

public class Account {
	private String id;
	private long balance;
	
	public Account() {
		
	}
	
	
	public Account(String id, long balance) {
		this.id = id;
		this.balance = balance;
	}
	
	public void deposit(long amt) {
		
		balance += amt;
		
	}
	
	public boolean withdraw(long amt) {
		if(balance < amt) {
			return false;
		}
		
		balance -= amt;
		return true;
		
		
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public long getBalance() {
		return balance;
	}

	public void setBalance(long balance) {
		this.balance = balance;
	}
	
	
	

}

Customer.java

package kosta.bank;

public class Customer {
	private String id;
	private String name;
	private Account account;
	
	public Customer() {
		
	}
	
	public Customer(String id, String name, long balance) {
		this.id = id;
		this.name = name;
		this.account = new Account(id, balance);
	}

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Account getAccount() {
		return account;
	}

	public void setAccount(Account account) {
		this.account = account;
	}
	
	
}

MyBank.java

package kosta.bank;

public class MyBank {
	private Customer customers[];
	private int customersNum;
	
	
	public MyBank() {
		customers = new Customer[10];
	}
	
	public void addCustomer(String id, String name, long balance) {
		
		customers[customersNum++] = new Customer(id, name, balance);
	}
	
	public Customer getCustomer(String id) {
		Customer cust = null;
		
		for(int i = 0 ; i < customersNum; i++) {
			if(customers[i].getId().equals(id)) {
				cust = customers[i];
				break;
			}
		}
		
		return cust;
		
	}
	
	public Customer[] getAllCustomers() {
		Customer newCustomers[] = new Customer[customersNum];
		
//		for(int i = 0; i < customersNum; i++) {
//			newCustomers[i] = customers[i];
//		}
		
		System.arraycopy(customers, 0, newCustomers, 0, customersNum);
		
		return newCustomers;
		
		
	}
}