Java random, various processing

--Simple random numbers

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

--Non-duplicate random number list

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

--List random number acquisition

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

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