先来看看面试官的描述:“如何在Integer类型的ArrayList中同时添加String、Character、Boolean等类型的数据呢?”看到这里,你是不是想到下面的代码?...这种方式是最常用的,在各类框架的配置文件中可以看到,如:Spring、SpringMVC、Mybatis等等。...其中,参数par...
println(str.first()) //输出:1 println(str.first {it == '5'}) //输出:5 println(str.first {it == 'a'}) //输出: Exception in thread "main" java.util.NoSuchElementException: Char sequence contains no character matching the predicate. at com.example.demoapp.DemoCheckKt.main(DemoCheck....
println(str.first())//输出:1println(str.first {it =='5'})//输出:5println(str.first {it =='a'})//输出:Exceptioninthread"main"java.util.NoSuchElementException: Char sequence contains no character matching the predicate. at com.example.demoapp.DemoCheckKt.main(DemoCheck.kt:19) at com....
//设置标题的文字 @Title(R.string.child_title) class ChildActivity : BaseVMActivity<ActivityChildBinding, ChildViewModel>() 如果标题栏文字要根据接口显示不同的文字,也有接口设置 class ChildActivity : BaseVMActivity<ActivityChildBinding, ChildViewModel>() { @OnClickFirstDrawable(R.drawable.more) fun...
length } fun main(args: Array<String>) { fun printLength(obj: Any) { println("'$obj' string length is ${getStringLength(obj) ?: "... err, not a string"} ") } printLength("Incomprehensibilities") printLength(1000) printLength(listOf(Any())) } 或者 代码语言:javascript 代码运行...
*/println("String Length: "+ firstName.length) } 输出: String Length:9String Length:9 比较Kotlin 中的String 让我们举一个例子来比较 Kotlin 中的两个字符串。有两种比较字符串的方法,使用equals()方法或使用compareTo()方法。 /** * created by Chaitanya for Beginnersbook.com ...
println(s.first()) println(s.last()) } The example shows how to get the first and last characters of a string. It uses indexing operations and alternative string methods. println(s[0]) println(s[s.length-1]) The indexes start from zero; therefore, the first character has zero index....
即ArrayList<Integer>() 和ArrayList<Character>() 是不能区分的。 Kotlin与Java 中的数组 与Java 不同,Kotlin 中的数组是非型变的,即 Kotlin 不允许我们把一个 Array<String> 赋值给一个 Array<Any>。 Java 平台上,持有原生数据类型的数组避免了装箱/拆箱操作的开销。 在Kotlin中,对于每种原生类型的数组都有...
[0] is the first element. [1] is the second element, [2] is the third element, etc.String LengthA String in Kotlin is an object, which contain properties and functions that can perform certain operations on strings, by writing a dot character (.) after the specific string variable. ...
String.capitalize() returns a copy of this string having its first letter upper-cased. String.capitalize() returns the original string, if it's empty or already starts with an upper-case. Example : To capitalize first character of each word in the given