ざっくりオブジェクト指向プログラミング解説：サンプルコード ＃４実践編①

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　こちらは別サイトの動画の『ざっくりオブジェクト指向プログラミング解説』で使用したサンプルコードを公開する記事になっています。
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1.1 Main　ー第２章ソースコードー

　オブジェクト指向要素のないMainクラス。

import Basket.BasicInformation;
import Basket.PurchasedGoods;

import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

public class Main {
   public final static String HR =  "===============================";
   public final static String HR2 = " ----------------------------- ";

   public static void main(String[] args) {
       //レシート印字用のデータ生成
       BasicInformation basicInformation = getBasicInformation();
       List<PurchasedGoods> goodsList = getGoodsList();

       //ここからがレシート処理
       //header
       System.out.println();
       System.out.println(lineFormatCenter(basicInformation.getStoreName()));
       System.out.println(basicInformation.getBranchName());
       System.out.println();
       System.out.println(HR);

       //contents
       String printStr = null;
       BigDecimal sum = new BigDecimal("0");
       for(PurchasedGoods goods : goodsList){
           sum = sum.add(goods.getPrice());
           printStr = lineFormatGoodsRow(goods.getGoodsName(), goods.getPrice());
           System.out.println(printStr);
       }
       System.out.println(HR2);
       printStr = lineFormatGoodsRow("合計", sum);
       System.out.println(printStr);

       System.out.println(HR2);
       basicInformation.getPaymentAmount().intValue();
       printStr = lineFormatGoodsRow("お預り", basicInformation.getPaymentAmount());
       System.out.println(printStr);

       BigDecimal change = basicInformation.getPaymentAmount().subtract(sum);
       printStr = lineFormatGoodsRow("お釣り", change);
       System.out.println(printStr);

       //footer
       System.out.println(HR);
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日　hh時mm分ss秒");
       System.out.println(sdf.format(basicInformation.getPurchaseTime()));

   }


   //テスト用のBasicInformationを生成する
   private static BasicInformation getBasicInformation(){
       Calendar c = Calendar.getInstance();
       c.set(2019,1,10,12,34,50);

       return new BasicInformation("イタコ食堂","恐山支店",c.getTime(),"2000");
   }

   //テスト用のPurchasedGoodsリストを生成する
   private static List<PurchasedGoods> getGoodsList(){
       ArrayList<PurchasedGoods> goodsList = new ArrayList<PurchasedGoods>();

       goodsList.add(new PurchasedGoods("あじの盛り塩焼き","500"));
       goodsList.add(new PurchasedGoods("水の子サラダ","250"));
       goodsList.add(new PurchasedGoods("お神酒","300"));

       return goodsList;
   }

   private static String lineFormatGoodsRow(String gName, BigDecimal gPrice){
       final int gNameLen = 20;
       final int gPriceLen = 6;

       int diffStrLen = 0;
       for(char c : gName.toCharArray()){
           if(String.valueOf(c).getBytes().length > 1){
               //全角の場合
               diffStrLen++;
           }
       }

       return String.format(" %-"+ (gNameLen - diffStrLen) +"s %" + gPriceLen + "d円 ",gName,gPrice.intValue());

   }

   private static String lineFormatCenter(String orgStr){
       final int strLen = 31;

       int diffStrLen = 0;
       for(char c : orgStr.toCharArray()){
           if(String.valueOf(c).getBytes().length > 1){
               //全角の場合
               diffStrLen++;
           }
       }

       int preSpCnt = (strLen - orgStr.length() - diffStrLen) / 2;
       //String displayStr = IntStream.range(0, preSpCnt).mapToObj(i -> " ").collect(Collectors.joining("", "", orgStr));
       StringBuffer displayStr = new StringBuffer();
       for(int i = 0 ; i < preSpCnt; i++) {
           displayStr.append(" ");
       }
       displayStr.append(orgStr);

       return String.format("%-"+ (strLen - diffStrLen) +"s",displayStr);
   }
}

1.2 BasicInformation　ー第２章ソースコードー

　店舗の基礎的な情報を保持するクラス。

package Basket;

import java.math.BigDecimal;
import java.util.Date;

public class BasicInformation {

   private String storeName = null;
   private String branchName = null;
   private Date purchaseTime = null;
   private BigDecimal paymentAmount = null;

   public BasicInformation(){
   }

   public BasicInformation(String storeName, String branchName, 
       Date purchaseTime, String paymentAmount){
       setStoreName(storeName);
       setBranchName(branchName);
       setPurchaseTime(purchaseTime);
       setPaymentAmount(paymentAmount);
   }

   public String getStoreName() {
       return storeName;
   }

   public void setStoreName(String storeName) {
       this.storeName = storeName;
   }

   public String getBranchName() {
       return branchName;
   }

   public void setBranchName(String branchName) {
       this.branchName = branchName;
   }

   public Date getPurchaseTime() {
       return purchaseTime;
   }

   public void setPurchaseTime(Date purchaseTime) {
       this.purchaseTime = purchaseTime;
   }

   public BigDecimal getPaymentAmount() {
       return paymentAmount;
   }

   public void setPaymentAmount(BigDecimal paymentAmount) {
       this.paymentAmount = paymentAmount;
   }

   public void setPaymentAmount(String paymentAmount) {
       this.paymentAmount = new BigDecimal(paymentAmount);
   }
}

1.3 PurchasedGoods　ー第２章ソースコードー

　購入商品の情報を保持するクラス。

package Basket;

import java.math.BigDecimal;

public class PurchasedGoods {
   private String goodsName = null;

   private BigDecimal price = null;

   public PurchasedGoods(String goodsName, String price){
       this.goodsName = goodsName;
       this.price = new BigDecimal(price);
   }

   public String getGoodsName() {
       return goodsName;
   }

   public BigDecimal getPrice() {
       return price;
   }

}

2.1 Main　ー第３章ソースコードー

　役割分担後のMain。

import Basket.BasicInformation;
import Basket.PurchasedGoods;
import receipt.nooop.ReceiptController;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.List;

public class Main {

   public static void main(String[] args) {

       BasicInformation basicInformation = getBasicInformation();
       List<PurchasedGoods> goodsList = getGoodsList();

       ReceiptController receiptController = new ReceiptController();
       receiptController.execute(basicInformation,goodsList);

   }

   //テスト用のBasicInformationを生成する
   private static BasicInformation getBasicInformation(){
       Calendar c = Calendar.getInstance();
       c.set(2019,1,10,12,34,50);

       return new BasicInformation("イタコ食堂","恐山支店",c.getTime(),"2000");
   }

   //テスト用のPurchasedGoodsリストを生成する
   private static List<PurchasedGoods> getGoodsList(){
       ArrayList<PurchasedGoods> goodsList = new ArrayList<PurchasedGoods>();

       goodsList.add(new PurchasedGoods("あじの盛り塩焼き","500"));
       goodsList.add(new PurchasedGoods("水の子サラダ","250"));
       goodsList.add(new PurchasedGoods("お神酒","300"));

       return goodsList;
   }

}

2.2 ReceiptController 　ー第３章ソースコードー

　役割分担で追加したクラス。

package receipt.nooop;

import Basket.BasicInformation;
import Basket.PurchasedGoods;

import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.List;

public class ReceiptController {
   public final static String HR =  "===============================";
   public final static String HR2 = " ----------------------------- ";

   public void execute(BasicInformation basicInformation, List<PurchasedGoods> purchasedGoodsList){
       //header
       createHeader(basicInformation);

       //contents
       createContents(basicInformation, purchasedGoodsList);

       //footer
       createFooter(basicInformation);
   }

   private void createHeader(BasicInformation basicInformation) {
       //header
       System.out.println();
       System.out.println(lineFormatCenter(basicInformation.getStoreName()));
       System.out.println(basicInformation.getBranchName());
       System.out.println();
       System.out.println(HR);
   }

   private void createContents(BasicInformation basicInformation, List<PurchasedGoods> purchasedGoodsList) {
       //contents
       String printStr = null;
       BigDecimal sum = new BigDecimal("0");
       for(PurchasedGoods goods : purchasedGoodsList){
           sum = sum.add(goods.getPrice());
           printStr = lineFormatGoodsRow(goods.getGoodsName(), goods.getPrice());
           System.out.println(printStr);
       }
       System.out.println(HR2);

       printStr = lineFormatGoodsRow("合計", sum);
       System.out.println(printStr);

       System.out.println(HR2);
       basicInformation.getPaymentAmount().intValue();
       printStr = lineFormatGoodsRow("お預り", basicInformation.getPaymentAmount());
       System.out.println(printStr);

       BigDecimal change = basicInformation.getPaymentAmount().subtract(sum);
       printStr = lineFormatGoodsRow("お釣り", change);
       System.out.println(printStr);

   }

   private void createFooter(BasicInformation basicInformation) {
       //footer
       System.out.println(HR);
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日　hh時mm分ss秒");
       System.out.println(sdf.format(basicInformation.getPurchaseTime()));
   }

   private String lineFormatGoodsRow(String gName, BigDecimal gPrice){
       final int gNameLen = 20;
       final int gPriceLen = 6;

       int diffStrLen = 0;
       for(char c : gName.toCharArray()){
           if(String.valueOf(c).getBytes().length > 1){
               //全角の場合
               diffStrLen++;
           }
       }

       return String.format(" %-"+ (gNameLen - diffStrLen) +"s %" + gPriceLen + "d円 ",gName,gPrice.intValue());

   }

   private String lineFormatCenter(String orgStr){
       final int strLen = 31;

       int diffStrLen = 0;
       for(char c : orgStr.toCharArray()){
           if(String.valueOf(c).getBytes().length > 1){
               //全角の場合
               diffStrLen++;
           }
       }

       int preSpCnt = (strLen - orgStr.length() - diffStrLen) / 2;
       //String displayStr = IntStream.range(0, preSpCnt).mapToObj(i -> " ").collect(Collectors.joining("", "", orgStr));
       StringBuffer displayStr = new StringBuffer();
       for(int i = 0 ; i < preSpCnt; i++) {
           displayStr.append(" ");
       }
       displayStr.append(orgStr);

       return String.format("%-"+ (strLen - diffStrLen) +"s",displayStr);
   }

}

2.3 BasicInformation　ー第３章ソースコードー

　変更無いため省略。
　「1.2 BasicInformation　ー第２章ソースコードー」を参照のこと。

2.4 PurchasedGoods　ー第３章ソースコードー

　変更無いため省略。
　「1.3 PurchasedGoods　ー第２章ソースコードー」を参照のこと。

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