[JAVA] Find the number of days in a month with Kotlin

import java.util.*

fun main(args: Array<String>) {
    val calendar = Calendar.getInstance()
    val year = 2020
    val month = 2
    calendar.set(year, month - 1, 1) //Note that the month is specified starting from 0
    val maxDay = calendar.getActualMaximum(Calendar.DAY_OF_MONTH)
    print("${year}Year${month}The moon${maxDay}There is a day")
}

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