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Java 配列、ArrayListの重複をなくす

Last updated at Posted at 2023-08-22
配列の中にある重複をなくし、Hashsetに保存
HashSet<String> set = new HashSet<>(Arrays.asList(arrays));

配列の中にある重複なしの要素のカウントする
int arrayCount = new HashSet<>(Arrays.asList(arrays)).size();

ArrayListの中にある重複をなくし、Hashsetに保存
HashSet<String> set = new HashSet<>(arrayList);

ArrayListの中にある重複なしの要素のカウントする
int arrayListCount = new HashSet<>(arrayList).size();
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