fun require(value: Boolean) fun require(value: Boolean, lazyMessage: () -> Any) fun <T : Any> requireNotNull(value: T?) fun <T : Any> requireNotNull(value: T?, lazyMessage: () -> Any) check check(boolean)用来检测对象的状态(属性),如果boolean为false,抛出异常IllegalStateException 示...
先使用checkNotNull(name, {"变量为空"})先决条件函数 , 判定name是否为空 , 如果为空 , 抛出带信息的IllegalStateException异常 信息 ; 代码语言:javascript 代码运行次数:0 运行 AI代码解释 funmain(){varname:String?=null// 捕获并处理异常try{checkNotNull(name,{"变量为空"})name!!.count();}catch(...
fun <T : Any> requireNotNull(value: T?, lazyMessage: () -> Any) check check(boolean)用来检测对象的状态(属性),如果boolean为false,抛出异常IllegalStateException 示例代码 12345678910111213 classEngine{varisStarted=falsefunspeedUp(){check(isStarted){"Engine is not started, cannot be speed up now"}...
fun require(value: Boolean, lazyMessage: () -> Any) fun <T : Any> requireNotNull(value: T?) fun <T : Any> requireNotNull(value: T?, lazyMessage: () -> Any) check check(boolean)用来检测对象的状态(属性),如果boolean为...
return checkNotNull(value) { "Required value was null." } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. require 函数 : 参数为 false , 抛出 IllegalArgumentException 异常 ; /** * 如果[value]为false,则抛出[IllegalArgumentException]。
KT-58472 Secondary constructor breaks MUST_BE_INITIALIZED check KT-58902 K2: Calls to overridden method with default parameter are not compiled KT-58549 K2: variable type is infered to non-existing interface KT-58613 K2: ConcurrentModificationException from FirSignatureEnhancement.performFirstRoundOfBoun...
此方法将路径作为输入并测试用户的权限。...让我们看下面的示例,该示例使用fs.access()检查给定目录是否存在: const fs = require('fs'); // directory to check if exists const...'does not exist' : 'exists'}`); }); 查看本指南,以了解有关在Node.js应用程序中读写文件的更多信息。 12.1K10 在...
// Check the current state of the lifecycle as the previous check is not guaranteed // to be done on the main thread. if(currentState === Lifecycle.State.DESTROYED)return@withContext // Instance of the running repeating coroutine varlaunchedJob: Job? =null ...
Validate inputs with the require() function Validate state with the check() function Avoid arrays in public signatures Avoid varargs Sealed classes and interfaces | Kotlin Documentation https://kotlinlang.org/docs/sealed-classes.html
To compile, we have to check if it’s not null: if(nullableVar){ nullableVar.length } Or, shorter: nullableVar?.length This way, if nullableVar is null, nothing happens. Otherwise, we can mark variable as not nullable, without a question mark after type: var nonNullableVar: String...