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Java random, 処理いろいろ

Java

Last updated at 2019-07-11Posted at 2019-07-04

単純な乱数

new Random().nextXxx();
new Random().nextXxx(10);

重複なし乱数リスト

new Random().ints(0, Integer.MAX_VALUE)
    .distinct()
    .limit(10)
    .boxed()
    .collect(Collectors.toList())

リスト乱数取得

list.get(random.nextInt(list.size()));

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