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Java Mapをループさせる方法(forEach / 拡張for文)

Last updated at Posted at 2019-12-09

JavaでMapをループさせる方法をメモ

Map<String, String> map = new HashMap<>();
// mapのkey,valueのset処理は省略

// forEachのパターン
map.forEach((k, v) -> {
    System.out.println(k);
    System.out.println(v);
});

// 拡張for文のパターン
for(Map.Entry<String, String> entry : map.entrySet()){
    System.out.println(entry.getKey());
    System.out.println(entry.getValue());
}

forEachの方がすっきりして見やすいかも。

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