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Language	Kotlin
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fun Any?.toString(): String {
    if (this == null) return "null"
    // 空检测之后，“this”会自动转换为非空类型，所以下面的 toString()
    // 解析为 Any 类的成员函数
    return toString()
}
fun main(arg:Array<String>){
    var t = null
    println(t.toString())
}
 
 
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Snippet Metadata
Owner	w3xue
Created	2 years ago
Modified	2 years ago
Visibility	Public