classMyClass{lateinitvarname:StringfuninitializeName(name:String){this.name=name}fundisplayName(){if(::name.isInitialized){println("名字:$name")}else{println("名字尚未初始化!")}}}funmain(){valmyClass=MyClass()myClass.d
1. 赋值与比较符号 = 赋值符号 == 值比较符号 === 引用比较符号 2. 逻辑运算符符号 && 逻辑与 |...
运行 复制 This variable must either have a type annotation or be initialized 3. 显式类型声明 ( var 变量名 : 变量类型 (= 变量值) | var age : Byte = 27 | var time_stap : Long | var name : String = “Joe” ) 显示类型声明 : 1.格式 : var 变量名 : 变量类型 (= 变量值) ; 2....
会报kotlin.UninitializedPropertyAccessException: lateinit property test has not been initialized 除了使用lateinit外还可以使用by lazy {}效果是一样的: private val test by lazy { "haha" } private fun switchFragment(position: Int) { if (test == null) { LogUtil.e("@@@", "test is null") }...
非空对象要么在声明时就赋值,要么在方法调用前赋值;否则未经初始化就调用该对象的方法,Kotlin会像语法错误那样提示这里“Variable *** must be initialized”。至于可以为空的对象,可于声明之时在类型后面加个问号,如同上一篇文章声明可空字符串数组的代码“val poem2Array:Array<String?> = ***”,只声明一个可...
()_value=typedValue//并把这个实例对象保存在_value中initializer=nulltypedValue}}}overridefunisInitialized():Boolean=_value!==UNINITIALIZED_VALUEoverridefuntoString():String=if(isInitialized())value.toString()else"Lazy value not initialized yet."privatefunwriteReplace():Any=InitializedLazyImpl(value)}...
Intrinsics.checkNotNullParameter(var1,"<set-?>");this.sequence = var1; } }publicstaticvoidthrowUninitializedPropertyAccessException(String propertyName){ throwUninitializedProperty("lateinit property "+ propertyName +" has not been initialized"); ...
Initialized empty Git repository in <directory_you_choose/.git> 我们初始化了仓库。 让我们添加第一个文件--vi notes.txt。 填充notes.txt并保存一些内容。 执行git add .来添加所有相关文件。 然后:git commit -m "Journaler: First commit" 控制台输出将会是这样的: [master (root-commit) 5e98ea4]...
If you hold a reference to an instance of Lazy, isInitialized() allows you to check whether it has already been initialized (and you can obtain such instance with reflection from a delegated property). To check whether a lateinit property has been initialized, you can use property::isInitialize...
if (test == null) { LogUtil.e("@@@", "test is null") } else { LogUtil.e("@@@", "test is not null") check(test) } } 会报kotlin.UninitializedPropertyAccessException: lateinit property test has not been initialized 除了使用lateinit外还可以使用by lazy {}效果是一样的: ...