Kotlin类的通用界限

Question

以下泛型不编译.这里的语义错在哪里？

函数调用

start(MainActivity.javaClass) // <== Doesn't compile

方法定义

// Definition
public fun <T : Activity> start(activityClass: Class<T>) {
    startActivity(Intent(this, activityClass))
}

编译错误

Error:(43, 9) Type parameter bound for T in fun <T : android.app.Activity> 
start(activityClass: java.lang.Class<T>): kotlin.Unit is not satisfied:  
inferred type com.mobsandgeeks.hellokotlin.MainActivity.
<class-object-for-MainActivity> is not a subtype of android.app.Activity

Answer 1

javaClass已被弃用。使用这个代替：

val i = Intent(this@Activity, Activity::class.java)
startActivity(i)