回答編集履歴
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修正
test
CHANGED
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@@ -1,68 +1,3 @@
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1
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jimbeさんが回答して頂いたもので、完成していました。
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2
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3
3
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ありがとうございました。
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4
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'''
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5
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import java.util.*;
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6
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class AList {
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7
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int id;
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8
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String title;
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9
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AList(int id, String title) {
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this.id = id;
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this.title = title;
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}
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@Override
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public String toString() {
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return new StringBuilder("AList")
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.append("[id=").append(id)
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.append(",title=").append(title)
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.append("]").toString();
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}
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}
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class Card {
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int card_id;
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String card_title;
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int List_id;
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Card(int card_id, String card_title, int List_id) {
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this.card_id = card_id;
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this.card_title = card_title;
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this.List_id = List_id;
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}
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@Override
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public String toString() {
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return new StringBuilder("card")
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.append("[card_id=").append(card_id)
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.append(",card_title=").append(card_title)
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.append(",List_id=").append(List_id)
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.append("]").toString();
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}
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}
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public class Main {
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public static void main(String[] args) {
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AList[] alists = { new AList(3,"tokyo"), new AList(5,"kyoto") };
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Card[] cards = { new Card(1,"study",3), new Card(2,"Reading",5), new Card(3,"Speaking",5) };
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System.out.println(Arrays.toString(alists));
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System.out.println(Arrays.toString(cards));
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System.out.println();
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49
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Map<AList,Card[]> map = new HashMap<AList,Card[]>();
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for(AList alist : alists) {
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List<Card> list = new ArrayList<>();
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for(Card card : cards) {
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if(alist.id == card.List_id) list.add(card);
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}
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map.put(alist, list.toArray(new Card[list.size()]));
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}
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System.out.print("{");
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boolean first = true;
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for(Map.Entry<AList,Card[]> entry : map.entrySet()) {
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if(first) first = false; else System.out.print(",");
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System.out.print(entry.getKey() + "," + Arrays.toString(entry.getValue()));
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}
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System.out.println("}");
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}
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}
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68
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'''
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