so writing “val” or “var” in front of aparameter in a function, catch block of for-loop...
仅允许使用 String 或原始类型初始化 const val。data class Mutable(var mute:Int) const val CONST...
parameter in a function, catch block of for-loop is no longer allowed.有用 回复 mindjet 1863 发布于 2017-10-24 构造函数的参数加上 var 和val 是一种简洁的写法,意思是将该变量作为类的成员变量来使用: class Dump(val x: String) {} 相当于 public class Dump { public String x; public Dump...
@NotNullStringprefix,@NotNullStringpostfix){Intrinsics.checkParameterIsNotNull(collection,"collection");Intrinsics.checkParameterIsNotNull(separator,"separator");Intrinsics.checkParameterIsNotNull(prefix,"prefix");Intrinsics.checkParameterIsNotNull(postfix,"postfix");StringBuildersb=newStringBuilder(prefix);...
@NotNullprivateString name="I am var";@NotNullpublicfinal StringgetName(){return"I am get method";}publicfinalvoidsetName(@NotNull String value){Intrinsics.checkParameterIsNotNull(value,"value");this.name=value+"setValue";} 可以看出来,对应的get跟set方法都变了 ...
👇valfina1=1// 👇 参数是没有 val 的funmethod(final2:String){👇valfinal3="The parameter is "+final2} Kotlin 可以看到不同点主要有: final 变成了 val。 Kotlin 函数参数默认是 val 类型,所以参数前不需要写 val 关键字,Kotlin 里这样设计的原因是保证了参数不会被修改,而 Java 的参数可修改(...
publicstaticfinalvoidprintlnMsg(@NotNullObject...msg){Intrinsics.checkParameterIsNotNull(msg,"msg");Stringvar1=ArraysKt.joinToString$default(msg,(CharSequence)" ",(CharSequence)null,(CharSequence)null,0,(CharSequence)null,(Function1)null,62,(Object)null);booleanvar2=false;System.out.println(var1...
A function with oneIntparameter, andIntreturn type: funmyFunction(x:Int):Int{return(x+5)}funmain(){varresult=myFunction(3)println(result)}// 8 (3 + 5) Try it Yourself » Using two parameters: Example A function with twoIntparameters, andIntreturn type: ...
1//6.可变参数的类型是函数或lamuda表达式2fun fun6(vararg lambdas : (a : Int,b : Int) ->Int) : Int{3vartotal =04for(iin0until lambdas.size){5val lambda =lambdas[i]6total += lambda(i,10)7}8returntotal9}10fun add(a : Int,b : Int) = a +b11fun vararg_test6(){12val sum...
相比Java,Kotlin做最简单的事情,也比Java简单很多,不再像“万物皆对象”那样,为一个简单的Hello World程序也要创建一个类,把函数包进类定义中。Kotlin也不再称main为方法(method),而是函数(function)。 This particular function – the main function indicates the starting place for your program. This is call...