[ Kotlin ] Property Delegate

About Property Delegate

property delegate enable you get or set a property value
by DelegateObject.getValue or DelegateObject.setValue
in this way, Delegate object can be reused in similar places
Sources

1. fun main() {
2.     val hello = Hello()
3.     hello.name = "tom"
4.     println(hello.name)
5. }
7. class Hello {
9.     var name: String by Delegate()
10. }
12. class Delegate {
14.     private var value = ""
16.     operator fun getValue(thisRef: Any, property: KProperty<*>): String {
17.         return "${thisRef.javaClass.simpleName}::${property.name}=${value}"
18.     }
20.     operator fun setValue(thisRef: Any, property: KProperty<*>, value: String) {
21.         this.value = value
22.     }
23. }

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