类中的GlobalScope.launch（coroutineContext）vs launch（）扩展了CoroutineScope

Question

As codes shown below,

1. Will two launchWithXXX functions run in MainScope ? Are they creating the same coroutine environment for running both jobs?
2. Will both functions be canceled when dispose() is called?

class A : CoroutineScope by MainScope() {

    fun launchWithGlobalScope() {
        GlobalScope.launch(coroutineContext) {
            // Run jobs
        }
    }

    fun launchWithClassScope() {
        launch {
            // Run jobs too
        }
    }

    fun dispose() {
        cancel()
    }
}

Answer 1

Answer for 1: No. MainScope defines a scope for doing something with UI components. So it runs in the UI thread of your platform. GlobalScope is a scope with an own thread pool and runs the coroutine with one of those threads.

Answer for 2: cancel does only stop the MainScope in your example and all coroutines created with this scope.