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【java】javaの連想配列の2次元配列 キーを指定しないデータ構造 こんな感じのデータ [{名前=高橋, 国語=78}, {名前=吉田, 国語=50}]

Last updated at Posted at 2022-06-10

コード

import java.util.*;
    public class Main {
    public static void main(String[] args) throws Exception {
        List<Map<String, Object>> nameMap = new ArrayList<>();
        //
        Map<String, Object> scoresMap_suzuki = new LinkedHashMap<String, Object>();
        scoresMap_suzuki.put("name", "高橋");
        scoresMap_suzuki.put("japanese", 78);
        scoresMap_suzuki.put("math", 90);
        //
        Map<String, Object> scoresMap_satoh = new LinkedHashMap<String, Object>();
        scoresMap_satoh.put("name", "吉田");
        scoresMap_satoh.put("japanese", 50);
        scoresMap_satoh.put("math", 40);
        //
        nameMap.add(scoresMap_suzuki);
        nameMap.add(scoresMap_satoh);
        System.out.println(nameMap);
        nameMap.forEach(s -> System.out.println(s.get("name"))); // forEachメソッド
    }
}

結果

[{name=高橋, japanese=78, math=90}, {name=吉田, japanese=50, math=40}]
高橋
吉田

もっと短くコードをかける方法を知ってたら、教えてね

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