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[ kotlin-stdlib ](../../index.html) / [ kotlin.properties ](../index.html) / [
ObservableProperty ](index.html) / [ <init> ](./-init-.html)

#  <init>

Common

JVM

JS

Native

1.0

` ObservableProperty  (  initialValue  :  Â  V  )  `

Implements the core logic of a property delegate for a read/write property
that calls callback functions when changed.

###  Parameters

` initialValue ` \- the initial value of the property.

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[ ](https://jetbrains.com)

Supported and developed byÂ [ JetBrains ](https://www.jetbrains.com/) .

Kotlinâ¢ isÂ protected under the  [ KotlinÂ Foundation
](https://kotlinlang.org/foundation/kotlin-foundation.html)  
andÂ licensed under the  [ Apache 2Â license
](https://github.com/JetBrains/kotlin-web-site/blob/master/LICENSE) .
[ ](https://kotlinlang.org) [ v1.9.23
](https://github.com/JetBrains/kotlin/releases/tag/v1.9.23)

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[ â Docs ](/docs/home.html)

[ kotlin-stdlib ](../../index.html) / [ kotlin.properties ](../index.html) / [
ObservableProperty ](index.html) / [ setValue ](./set-value.html)

#  setValue

Common

JVM

JS

Native

1.0

` open  fun  setValue  (  
Â Â Â Â  thisRef  :  Â  Any  ?  ,  
Â Â Â Â  property  :  Â [ KProperty
](../../kotlin.reflect/-k-property/index.html) < *  > ,  
Â Â Â Â  value  :  Â  V  )  `  
[ (source)
](https://github.com/JetBrains/kotlin/tree/0938b46726b9c6938df309098316ce741815bb55/libraries/stdlib/src/kotlin/properties/ObservableProperty.kt#L35)

Sets the value of the property for the given object.

###  Parameters

` thisRef ` \- the object for which the value is requested.

` property ` \- the metadata for the property.

` value ` \- the value to set.

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[ ](https://jetbrains.com)

Supported and developed byÂ [ JetBrains ](https://www.jetbrains.com/) .

Kotlinâ¢ isÂ protected under the  [ KotlinÂ Foundation
](https://kotlinlang.org/foundation/kotlin-foundation.html)  
andÂ licensed under the  [ Apache 2Â license
](https://github.com/JetBrains/kotlin-web-site/blob/master/LICENSE) .
[ ](https://kotlinlang.org) [ v1.9.23
](https://github.com/JetBrains/kotlin/releases/tag/v1.9.23)

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[ kotlin-stdlib ](../../index.html) / [ kotlin.properties ](../index.html) / [
Delegates ](index.html) / [ notNull ](./not-null.html)

#  notNull

Common

JVM

JS

Native

1.0

` fun  < T  Â  :  Â  Any  > notNull  (  )  :  [ ReadWriteProperty  ](../-read-
write-property/index.html) < Any  ?  ,  Â  T  > `  
[ (source)
](https://github.com/JetBrains/kotlin/tree/0938b46726b9c6938df309098316ce741815bb55/libraries/stdlib/src/kotlin/properties/Delegates.kt#L21)

Returns a property delegate for a read/write property with a non- ` null `
value that is initialized not during object construction time but at a later
time. Trying to read the property before the initial value has been assigned
results in an exception.

    
    
    import kotlin.properties.Delegates
    
    import kotlin.test.*
    
    fun main(args: Array<String>) {
    //sampleStart
    var max: Int by Delegates.notNull()
    
    // println(max) // will fail with IllegalStateException
    
    max = 10
    println(max) // 10
    //sampleEnd
    }

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[ ](https://jetbrains.com)

Supported and developed byÂ [ JetBrains ](https://www.jetbrains.com/) .

Kotlinâ¢ isÂ protected under the  [ KotlinÂ Foundation
](https://kotlinlang.org/foundation/kotlin-foundation.html)  
andÂ licensed under the  [ Apache 2Â license
](https://github.com/JetBrains/kotlin-web-site/blob/master/LICENSE) .
[ ](https://kotlinlang.org) [ v1.9.23
](https://github.com/JetBrains/kotlin/releases/tag/v1.9.23)

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[ kotlin-stdlib ](../../index.html) / [ kotlin.properties ](../index.html) / [
ObservableProperty ](index.html) / [ toString ](./to-string.html)

#  toString

Common

JVM

JS

Native

1.0

` open  fun  toString  (  )  :  String  `  
[ (source)
](https://github.com/JetBrains/kotlin/tree/0938b46726b9c6938df309098316ce741815bb55/libraries/stdlib/src/kotlin/properties/ObservableProperty.kt#L44)

Returns a string representation of the object.

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