在庫分析プログラムを考える

概要

在庫分析プログラムを作る。クラス継承の応用。

/*ものを表すItemクラス*/
class Item {

    private int count = 0;// 在庫数量
    private int price = 0;// 単価

    public int getCount() {
        return count;
    }

    public int getPrice() {
        return price;
    }

    public void setCount(int count) {
        this.count = count;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public int getAmount() {
        return price * count;
    }
}

class Book extends Item {
    Book(String input) {
        String[] data = input.split(",");
        setPrice(Integer.parseInt(data[3]));
        setCount(Integer.parseInt(data[4]));
    }

    public boolean isMany() {
        return getCount() >= 100;
    }
}

class DVD extends Item {
    DVD(String input) {
        String[] data = input.split(",");
        setPrice(Integer.parseInt(data[2]));
        setCount(Integer.parseInt(data[3]));
    }
}

public class ZaikoAnalyzer {
    public static void main(String[] args) {
        String[] lines = { "Book, カムイ伝,       白土三平,    500,  10",
                           "DVD,  インターステラー,           3000,  10",
                           "Book, バタアシ金魚,    望月峯太郎,  500, 200" };
        analyze(lines);
    }

    public static void analyze(String[] lines) {
        int countOFBooks = 0;
        int countOFManyBookTitle = 0;
        int countOFDVDs = 0;
        int amount = 0;

        for (String line : lines) {
            if (line.startsWith("Book")) {
                Book book = new Book(line);
                countOFBooks += book.getCount();
                if (book.isMany()) {
                    countOFManyBookTitle++;
                }
                amount += book.getAmount();
            } else {
                DVD dvd = new DVD(line);
                countOFDVDs += dvd.getCount();
                amount += dvd.getAmount();
            }
        }
        System.out.println("本の総数＝" + countOFBooks);
        System.out.println("DVDの総数＝" + countOFDVDs);
        System.out.println("100冊以上在庫のある本のタイトル数＝" + countOFManyBookTitle);
        System.out.println("総金額＝" + amount);
    }
}