Kotlin高阶函数及函数作为参数传递（2）

Kotlin高阶函数及函数作为参数传递（2）

在 https://blog.csdn.net/zhangphil/article/details/157394295 基础上改进。

import kotlin.random.Random

fun main() {
    val a = 1
    val b = 2
    sumFun(a, b, { it ->
        println("$a+$b=$it")
    })

    println("---")

    var n = 2025
    val s = "zhang"

    myTaskStart(n, s, { nn, ss, result ->
        println("myTaskStart $nn $ss $result")
    })

    n = 2026

    myTaskCancel(n, { nn, result ->
        println("myTaskCancel $nn $result")
    })
}

fun sumFun(a: Int, b: Int, func: (result: Int) -> Unit) {
    val sum = a + b
    func.invoke(sum)
}


private fun myTaskStart(n: Int, s: String, func: (num: Int, ss: String?, result: Boolean) -> Unit) {
    apiTask(n, s, object : ApiCallback {
        override fun apiExec(n: Int, s: String?, result: Boolean) {
            func.invoke(n, s, result)
        }
    })
}

private fun myTaskCancel(n: Int, func: (num: Int, result: Boolean) -> Unit) {
    apiTask(n, null, object : ApiCallback {
        override fun apiExec(n: Int, s: String?, result: Boolean) {
            func.invoke(n, result)
        }
    })
}

/**
 * 假设这里是api内部的耗时任务执行体
 */
fun apiTask(n: Int, s: String? = null, callback: ApiCallback) {
    val r = Random.nextBoolean()
    println("api task run n=$n s=$s")
    Thread.sleep(1000)

    callback.apiExec(n, s, r)
}

interface ApiCallback {
    fun apiExec(n: Int, s: String? = null, result: Boolean) {

    }
}

运行输出：

1+2=3

---

api task run n=2025 s=zhang

myTaskStart 2025 zhang true

api task run n=2026 s=null

myTaskCancel 2026 false

Process finished with exit code 0