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fun main(args: Array<String>) { val age = 23 val name = "w3xue" val bool = true doPrintln(age) // 整型 doPrintln(name) // 字符串 doPrintln(bool) // 布尔型 } fun <T> doPrintln(content: T) { when (content) { is Int -> println("整型数字为 $content") is String -> println("字符串转换为大写:${content.toUpperCase()}") else -> println("T 不是整型,也不是字符串") } }
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