百聞 不如一打 [백문이 불여일타]

백번 묻는것 보다 한번 쳐보는게 낫다

Java/Java log

2020-10-22 Java log - App.java

qbj700 2020. 10. 22. 21:02

- 게시물 최대 개수 제한 해제

- 객체 초기화 로직을 init으로 분리, 디폴트 테스트 게시물 32개로 지정

- 생성자 메서드 문법으로 init 함수 제거

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package com.sbs.example.easytextboard;
 
import java.util.Scanner;
 
public class App {
 
    private Article[] articles;
    private int lastArticleId;
    private int articlesSize;
 
    public App() {
        articles = new Article[32];
        lastArticleId = 0;
        articlesSize = 0;
 
        for (int i = 0; i < 32; i++) {
            add("제목" + (i + 1), "내용" + (i + 1));
        }
 
    }
 
    // 현재 게시물 갯수
    private int articlesSize() {
        return articlesSize;
    }
 
    // 게시물에 배열 번호 부여
    private Article getArticle(int id) {
        int index = getIndexById(id);
 
        if (index == -1) {
            return null;
        }
        return articles[index];
    }
 
    // 입력된 id가 articles[].id 와 일치하는지 여부 확인
    private int getIndexById(int id) {
        for (int i = 0; i < articlesSize(); i++) {
            if (articles[i].id == id) {
                return i;
            }
        }
        return -1;
    }
 
    // 게시물 삭제 함수
    private void remove(int id) {
        int index = getIndexById(id);
 
        if (index == -1) {
            return;
        }
        for (int i = index + 1; i < articlesSize(); i++) {
            articles[i - 1= articles[i];
        }
        articlesSize--;
    }
 
    // 게시물 생성 함수
    private int add(String title, String body) {
        if (isArticlesFull()) {
            System.out.printf("== 배열 사이즈 증가 (%d => %d) ==\n", articles.length, articles.length * 2);
 
            Article[] newArticles = new Article[articles.length * 2];
 
            for (int i = 0; i < articles.length; i++) {
                newArticles[i] = articles[i];
            }
            articles = newArticles;
        }
 
        Article article = new Article();
 
        article.id = lastArticleId + 1;
        article.title = title;
        article.body = body;
 
        articles[articlesSize] = article;
 
        articlesSize++;
        lastArticleId = article.id;
 
        return article.id;
    }
 
    // 게시물 수정 함수
    private void modify(int inputedId, String title, String body) {
        Article article = getArticle(inputedId);
        article.title = title;
        article.body = body;
    }
 
    // 게시물이 꽉 찻는지 확인하는 함수
    private boolean isArticlesFull() {
        return articlesSize == articles.length;
    }
 
    public void run() {
        Scanner sc = new Scanner(System.in);
 
        while (true) {
 
            System.out.printf("명령어 입력 :");
            String command = sc.nextLine();
 
            if (command.equals("article add")) {
                System.out.println("== 게시물 등록 ==");
 
                System.out.printf("제목 :");
                String title = sc.nextLine();
                System.out.printf("내용 :");
                String body = sc.nextLine();
 
                System.out.println("== 게시물 등록 결과 ==");
                System.out.printf("제목 :%s\n", title);
                System.out.printf("내용 :%s\n", body);
 
                int id = add(title, body);
 
                System.out.printf("%d번 게시물이 생성되었습니다.\n", id);
            } else if (command.equals("article list")) {
                System.out.println("== 게시물 리스트 ==");
 
                if (articlesSize() == 0) {
                    System.out.println("게시물이 존재하지 않습니다.");
                    continue;
                }
                System.out.println("번호 / 제목");
                for (int i = articlesSize() - 1; i >= 0; i--) {
                    Article article = articles[i];
                    System.out.printf("%d / %s\n", article.id, article.title);
                }
 
            } else if (command.startsWith("article detail ")) {
                int inputedId = Integer.parseInt(command.split(" ")[2]);
                System.out.println("== 게시물 상세 ==");
 
                Article article = getArticle(inputedId);
 
                if (article == null) {
                    System.out.printf("%d번 게시물은 존재하지 않습니다.\n", inputedId);
                    continue;
                }
 
                System.out.printf("번호 : %d\n", article.id);
                System.out.printf("제목 : %s\n", article.title);
                System.out.printf("내용 : %s\n", article.body);
 
            } else if (command.startsWith("article delete ")) {
                int inputedId = Integer.parseInt(command.split(" ")[2]);
                System.out.println("== 게시물 삭제 ==");
 
                Article article = getArticle(inputedId);
 
                if (article == null) {
                    System.out.printf("%d번 게시물은 존재하지 않습니다.\n", inputedId);
                    continue;
                }
                remove(inputedId);
                System.out.printf("%d번 게시물이 삭제되었습니다.\n", inputedId);
 
            } else if (command.startsWith("article modify ")) {
                int inputedId = Integer.parseInt(command.split(" ")[2]);
                System.out.println("== 게시물 수정 ==");
 
                Article article = getArticle(inputedId);
 
                if (article == null) {
                    System.out.printf("%d번 게시물은 존재하지 않습니다.\n", inputedId);
                    continue;
                } else {
                    System.out.printf("수정할 제목 :");
                    String title = sc.nextLine();
                    System.out.printf("수정할 내용 :");
                    String body = sc.nextLine();
 
                    modify(inputedId, title, body);
 
                    System.out.printf("%d번 게시물이 수정되었습니다.\n", inputedId);
                }
 
            } else if (command.startsWith("article search ")) {
                String articleSearch = command.split(" ")[2];
                System.out.println("== 게시물 검색 ==");
 
                System.out.println("번호 / 제목");
                for (int i = 0; i < articlesSize; i++) {
                    if (articles[i].title.contains(articleSearch)) {
                        System.out.printf("%d / %s\n", i + 1, articles[i].title);
                    }
                }
 
            } else if (command.equals("system exit")) {
                System.out.println("== 프로그램 종료 ==");
                break;
            } else {
                System.out.println("== 존재하지 않는 명령어 입니다  ==");
            }
        }
        sc.close();
    }
}
cs
 
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