メモ
val test = ArrayList<Int>()
test.add(1)
test.add(2)
test.add(3)
test.reversed() as ArrayList<Int>
→ 3.2.1
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メモ
val test = ArrayList<Int>()
test.add(1)
test.add(2)
test.add(3)
test.reversed() as ArrayList<Int>
→ 3.2.1
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