回答編集履歴
1
for の中身の修正方法を追加
test
CHANGED
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@@ -25,3 +25,149 @@
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```
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for の中で iListData を毎回上書きしているから、iList の最後のデータしか入りませんよ。
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**追記**
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for 文で単純代入するから上書きになるのです。
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+= でどんどん繋いでいけばよいでしょう。
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"\n" を挟んで連結することにしました。
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質問のコードは Item や inputuser が未定義なので、適当に補いました。
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```Java
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import java.io.*; // BufferedReader, InputStreamReader, IOException
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import java.util.*; // List, ArrayList
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class Main {
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public static void main(String[] args) throws IOException {
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Item iList01 = new Item("01", "desk", 5000);
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Item iList02 = new Item("02", "pen", 1000);
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ArrayList<Item> itemList = new ArrayList<>(); // ★ <Item>
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itemList.add(iList01);
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itemList.add(iList02);
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BufferedReader inputuser = new BufferedReader( // ★ inputuser
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new InputStreamReader(System.in));
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while (true) {
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System.out.println("1.一覧表示");
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String inputSelectMenuNo = inputuser.readLine();
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if (inputSelectMenuNo.equals("1")){
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ShowItems showitems = new ShowItems(itemList);
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showitems.ShowItem();
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}
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}
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}
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}
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class ShowItems {
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private List<Item> itemList;
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public ShowItems(ArrayList<Item> itemList ) {
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this.itemList = itemList;
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}
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public void ShowItem() {
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ProductsDisplay selectProductDisplay = new ProductsDisplay(itemList);
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String showDisplay = selectProductDisplay.productsDisplay();
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System.out.println(showDisplay);
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}
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}
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class ProductsDisplay {
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private List<Item> iList;
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public ProductsDisplay(List<Item> paramItemList){
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this.iList = paramItemList;
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}
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public String productsDisplay() {
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String iListData = "";
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for (Item i : this.iList) {
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iListData += i.getItemCode() + "," // ★ +=
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+ i.getItemName() + "," + i.getPrice() + "\n"; // ★ "\n"
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}
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return iListData;
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}
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}
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class Item { // ★ Item
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String code, name; int price;
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Item(String code, String name, int price) {
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this.code = code; this.name = name; this.price = price;
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}
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String getItemCode() { return code; }
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String getItemName() { return name; }
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int getPrice() { return price; }
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}
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```
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