kotlin: yield()的用途例子：保证 job 任务能够得到执行

一，例子：

代码：

        //处理按钮点击事件
        binding.button1.setOnClickListener {
            runBlocking {
                val job = launch {
                    try {
                        println("try start")
                        delay(1000)
                        println("try end")
                    } finally {
                        println("finally start")
                        delay(1000)
                        println("finally end")
                    }
                }
                yield()
                job.cancelAndJoin()
            }
        }

运行结果:

二，对比取消yield的结果:

代码：注释掉了yield(),此时job得不到执行，所以运行结果为空,什么都没有打印出来

        //处理按钮点击事件
        binding.button2.setOnClickListener {
            runBlocking {
                val job = launch {
                    try {
                        println("try start")
                        delay(1000)
                        println("try end")
                    } finally {
                        println("finally start")
                        delay(1000)
                        println("finally end")
                    }
                }
                //yield()
                job.cancelAndJoin()
            }
        }