Kotlin 中的 !! 和 ?. 之间的主要区别是什么？
Kotlin 

Kotlin 中的 !! 和 ?. 之间的主要区别是什么？

在 Kotlin 中，!! 和 ?. 是处理可为空类型的不同方法，都与 null 安全相关。
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标签

DrawStyle 2
lateinit VS lazy 1
Kotlin 2.0 1
AOSP 1
UriRelativeFilter 1
UriRelativeFilterGroup 2
Unresolved reference 1
ApplicationStartInfo 1
DETECT_SCREEN_RECORDING 1
GradientBorder 1
ClickableText 1
Private Space 1
Android 15 9
Widget 1
Deeplink 1
Flow 1
Ripple Effect 1
MediaStore 1
MediaPlayer 1
MediaMetadataRetriever 1
callbackFlow 1
ExpandableText 1
collectLatest 1
collect 1
copy VS deepcopy 1
Closure 1
drawWithCache 1
drawBehind 1
drawWithContent 1
Jsoup 1
Comparable VS Comparator 1
Comparable & Comparator 0
!! 和 ?. 1
INSTALL_FAILED_TEST_ONLY 1
TextToolbar 1
RTL 0
AndroidView 1
ComposeView 1
Additional settings in the app 1
ScreenBrightness 1
Jetpack Glance 4
BoxWithConstraints 1
LocalClipboardManager 1
ClipboardManager 1
onNewIntent 1
LocalInspectionMode 1
window.attributes 1
findActivity() 1
INSTALL_FAILED_SHARED_USER_INCOMPATIBLE 1
printStackTrace() 1
Nothing 1
Unit 1
Any 1
IllegalArgumentException 1
dp to px 1
sealed interface 1
sealed class 1
SnapshotMutationPolicy 1
mutableStateOf 1
minSdk 0
targetSdk 0
compileSdk 1
rememberSaveable 1
remember 1
values() 1
entries 1
UUID 1
const val 1
val 1
DisposableEffect 1
DefaultLifecycleObserver 1
运算符重载 1
operator overloading 1
ModalBottomSheetLayout 1
Snackbar 1
Canvas 3
DrawScope 1
config Bearer token 1
Postman 0
AnnotatedString 1
VisualTransformation 1
TextField 1
activity-alias 1
Room 1
Android Jetpack 1
@PreviewParameter 1
@ 0
@Preview 1
ActivityResultRegistry 1
onActivityResult deprecated 1
onActivityResult 0
Androidx 1
跑马灯 1
Marquee 1
YYYY-MM-dd 1
kotlin.Result 2
NoSuchElementException 0
Kotlin Exception 2
Android Exception 10
Pixel 7 1
Pixel 1
EmojiCompat 1
Emoji 1
Shadow Text Effect 1
S 0
gradle vs gradlew 1
Gradlew 1
Gradle 4
Termius 1
Xshell 1
Aliyun 1
自适应图标 1
Adaptive Icon 1
Compose BOM 1
CompositionLocal 2
Trailing Comma 1
Trailing Lambda 1
Android Studio 1
AGP 1
IllegalCharsetNameException 1
Text Overflow 1
plurals 1
Android 13 1
转载 1
ConstraintLayout 1
Exception 3
keystore 1
keytool 1
disassembler 1
JDK Tools 1
APK Signature Scheme 1
kotlin-stdlib-jdk8 1
Kotlin Gradle Plugin 1
G 0
JSON 2
post 1
curl 4
JS 1
JavaScript 1
Interface 1
Git 3
ADB 4
Compose Desktop 1
Analytics 1
Firebase 2
CNZZ 1
CVE-2021-44228 1
Log4j 1
MySQL 1
Text 6
Jetpack Compose 41
Python3 1
Python2 1
Python 4
Compose 4
Compose Multiplatform 2
Terminal 1
Shell 1
Java 10 1
var 1
Java 12
QUERY_ALL_PACKAGES 2
Android R 1
Android 11 1
Android 83
epel-release 1
Epel 1
Linux 2
Kotlin 36

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分类
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Python
Compose Multiplatform
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Linux
Kotlin
默认分类
标签
DrawStyle
lateinit VS lazy
Kotlin 2.0
AOSP
UriRelativeFilter
UriRelativeFilterGroup
Unresolved reference
ApplicationStartInfo
DETECT_SCREEN_RECORDING
GradientBorder
ClickableText
Private Space
Android 15
Widget
Deeplink
Flow
Ripple Effect
MediaStore
MediaPlayer
MediaMetadataRetriever
callbackFlow
ExpandableText
collectLatest
collect
copy VS deepcopy
Closure
drawWithCache
drawBehind
drawWithContent
Jsoup
Comparable VS Comparator
Comparable & Comparator
!! 和 ?.
INSTALL_FAILED_TEST_ONLY
TextToolbar
RTL
AndroidView
ComposeView
Additional settings in the app
ScreenBrightness
Jetpack Glance
BoxWithConstraints
LocalClipboardManager
ClipboardManager
onNewIntent
LocalInspectionMode
window.attributes
findActivity()
INSTALL_FAILED_SHARED_USER_INCOMPATIBLE
printStackTrace()
Nothing
Unit
Any
IllegalArgumentException
dp to px
sealed interface
sealed class
SnapshotMutationPolicy
mutableStateOf
minSdk
targetSdk
compileSdk
rememberSaveable
remember
values()
entries
UUID
const val
val
DisposableEffect
DefaultLifecycleObserver
运算符重载
operator overloading
ModalBottomSheetLayout
Snackbar
Canvas
DrawScope
config Bearer token
Postman
AnnotatedString
VisualTransformation
TextField
activity-alias
Room
Android Jetpack
@PreviewParameter
@
@Preview
ActivityResultRegistry
onActivityResult deprecated
onActivityResult
Androidx
跑马灯
Marquee
YYYY-MM-dd
kotlin.Result
NoSuchElementException
Kotlin Exception
Android Exception
Pixel 7
Pixel
EmojiCompat
Emoji
Shadow Text Effect
S
gradle vs gradlew
Gradlew
Gradle
Termius
Xshell
Aliyun
自适应图标
Adaptive Icon
Compose BOM
CompositionLocal
Trailing Comma
Trailing Lambda
Android Studio
AGP
IllegalCharsetNameException
Text Overflow
plurals
Android 13
转载
ConstraintLayout
Exception
keystore
keytool
disassembler
JDK Tools
APK Signature Scheme
kotlin-stdlib-jdk8
Kotlin Gradle Plugin
G
JSON
post
curl
JS
JavaScript
Interface
Git
ADB
Compose Desktop
Analytics
Firebase
CNZZ
CVE-2021-44228
Log4j
MySQL
Text
Jetpack Compose
Python3
Python2
Python
Compose
Compose Multiplatform
Terminal
Shell
Java 10
var
Java
QUERY_ALL_PACKAGES
Android R
Android 11
Android
epel-release
Epel
Linux
Kotlin