Kotlin中Lambda的使用于理解：匿名函数 == Lambda 表达式

fun main(args: Array<String>) {//匿名函数 == Lambda 表达式val addResultMethod = { number1: Int, number2: Int ->"两数相加之和：${number1 + number2}"}//addResultMethod:(Int, Int)->Stringprintln(addResultMethod(55, 22))//匿名函数 入参Int,    返回 Any类型//lambda表达式的参数Int,  lambda表达式的结果Any类型val weekResultMethod = { number: Int ->when (number) {1 -> "星期一"2 -> "星期二"3 -> "星期三"4 -> "星期四"5 -> "星期五"6 -> "星期六"7 -> "星期日"else -> -1}}//weekResultMethod:(Int)->Anyprintln(weekResultMethod(4))/*----------------------------------------------------*/val serverResponse = { responseMsg: String, responseCode: Int ->println("最终拿到服务器响应的结果是：responseMsg:$responseMsg, responseCode:$responseCode")}doLogin("yuknight", "123456", serverResponse)/*----------------------------------------------------*/doLogin("yuknight", "123456") { responseMsg: String, responseCode: Int ->println("最终拿到服务器响应的结果是：responseMsg:$responseMsg, responseCode:$responseCode")}/*----------------------------------------------------*///lambda函数返回值为Stringval serverResponse1 = { responseMsg: String, responseCode: Int ->println("lambda函数返回值为String" +"最终拿到服务器响应的结果是：responseMsg:$responseMsg, responseCode:$responseCode")"lambda函数返回值为String 最终拿到服务器响应的结果是：responseMsg:$responseMsg, responseCode:$responseCode"
//        println("最终拿到服务器响应的结果是：responseMsg:$responseMsg, responseCode:$responseCode")}doLogin1("yuknight", "123456",serverResponse1)/*----------------------------------------------------*/val responseMsg = {msg: String, code:Int->println("返回结果：msg:$msg, code:$code")}loginApi("yuknight", "123456", responseMsg)/*----------------------------------------------------*/loginApi("yuknight", "123456"){msg: String, code:Int->println("返回结果：msg:$msg, code:$code")}}//函数中定义参数是函数的函数
const val DB_SAVE_USER_NAME = "yuknight"
const val DB_SAVE_USER_PWD = "123456"fun doLogin(userName: String, userPwd: String, serverResponse: (String, Int) -> Unit) {if (DB_SAVE_USER_NAME == userName && DB_SAVE_USER_PWD == userPwd) {val serverResponseResult = "恭喜，登录成功！"serverResponse(serverResponseResult, 200)} else {val serverResponseResult = "对不起，登录失败！"serverResponse(serverResponseResult, 404)}
}
/*----------------------------------------------------*/
fun doLogin1(userName: String, userPwd: String, serverResponse: (String, Int) -> String) {if (DB_SAVE_USER_NAME == userName && DB_SAVE_USER_PWD == userPwd) {val serverResponseResult = "恭喜，登录成功！"serverResponse(serverResponseResult, 200)} else {val serverResponseResult = "对不起，登录失败！"serverResponse(serverResponseResult, 404)}
}/*----------------------------------------------------*/
fun loginApi(userName: String, userPwd: String, responseResult: (String, Int) -> Unit) {if (userName == null || userPwd == null) {responseResult("用户名或者密码错误", 500)}if (userName.length>3 &&userPwd.length>3){if (wbeServiceLoginApi(userName, userPwd)){responseResult("login sucess", 200)}else{responseResult("login fail", 444)}}else {responseResult("用户名或者密码错误", 500)}
}private fun wbeServiceLoginApi(name:String, pwd:String):Boolean{//Kotlin中if是表达式， java中if是语句return name == DB_SAVE_USER_NAME && pwd == DB_SAVE_USER_PWD
}//java 中则需要使用匿名函数以及回调的方式实现
//interface ResponseResult{
//     void result(String msg, int code);
//}