package my.demo
class DemoClass {
}
class Contact(val id:Int,var email: String = "[email protected]")
{
val category:String = "work"
fun info()
{
println("id:$id email: $email")
}
}
data class User(val name:String,val id:Int)
fun main()
{
// val contact = Contact(1,"[email protected]")
// println(contact)
// val user = User("aa",11)
// println(user)
// val secondUser = User("Alex",1)
// println("user == secondUser: ${user == secondUser}")
// println(user.copy("Max"))
// var nullable:String? = "You can keep a null here"
// nullable = null
// println(nullable)
println(describeString("abc"))
}
fun describeString(maybeString:String?):String
{
if(!maybeString.isNullOrEmpty())
{
return "String of length ${maybeString.length}"
}else{
return "Empty or null string"
}
}
Kotlin类
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转载自blog.csdn.net/zhuziying99/article/details/132020511
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