kotlin if-statement 我正在尝试制作一个简单的登录页面Kotlin程序。这里的概念是,该页面将从注册页面获取额外的意图,并使用它们验证用户是否使用相同的注册用户名和密码登录,然后将用户带到应用程序的主页。问题是,当用户确实输入了正确的输入时,意图就不会执行(或者更确切地说是if门)。 起初,我认为当我从寄存器页获...
The statement contains an expression 50 + 25 that returns an integer value 75. So, expressions are part of the statements.In Kotlin, if can be used as an expression. While using if as an expression, the else branch is mandatory to avoid compiler error.In addition, we can assign the ...
if-statementvariableskotlinoptimization 7 我有这行代码:if (x * y * z > maxProduct) maxProduct = x * y * z 我的问题是每次使用 x * y * z 时都需要重复两遍。我知道我可以在 if 语句之前创建一个变量,像这样: val product = x * y * z if (product > maxProduct) maxProduct = pr...
Compare Swiftif letStatement and KotlinletandrunFunctions Here is how we can use the Swiftif letstatement. ifletx=y.val{}else{} Syntax for theletandrunfunctions: valx = y?.let {// enter if y is not null.}?:run {// enter if y is null.} ...
Here’s an example of using an if statement in Kotlin: var wattage = 0 var lightbulbIsOn = true if (lightbulbIsOn) { wattage = wattage + 12 } Kotlin Listing 3.12 - Using if as a statement rather than an expression A few interesting things to note here: Unlike conditional expressions,...
语句，必须放在第一行（除注解外），多个文件层次间使用点号分隔： package foo.bar 此外，Kotlin 的 ...
In Kotlin, You can useifas an expression instead of a statement. For example, you can assign the result of anif-elseexpression to a variable. Let’s rewrite theif-elseexample of finding the maximum of two numbers that we saw in the previous section as an expression - ...
kotlin-我的if语句和运算符有问题 这是我的目标:用户单击减号按钮,金额减少一,并且有一个if语句不允许金额低于0。 这是我的代码: var number = 0 view.text_amount.visibility = View.GONE view.plus_btn.setOnClickListener { if (number == 5) {...
kotlin中if语句的返回类型这意味着键可以是空字符串 如果countryName那么，这是一个领域 ...
Kotlin - if...else ExpressionPrevious Quiz Next Kotlin if...else expressions works like an if...else expression in any other Modern Computer Programming. So let's start with our traditional if...else statement available in Kotlin.Syntax