Java 活动生命周期Android Studio

我最近研究了活动生命周期，对此我有一些疑问，以下是它们
这是密码。
表示android生命周期回调

onCreate

，

onRestoreSavedInstanceState

和

onSavedInstanceState

TextView textView;

// some transient state for the activity instance
String gameState;

@Override
public void onCreate(Bundle savedInstanceState) {
    // call the super class onCreate to complete the creation of activity like
    // the view hierarchy
    super.onCreate(savedInstanceState);

    // recovering the instance state
    if (savedInstanceState != null) {
        gameState = savedInstanceState.getString(GAME_STATE_KEY);
    }

    // set the user interface layout for this activity
    // the layout file is defined in the project res/layout/main_activity.xml file
    setContentView(R.layout.main_activity);

    // initialize member TextView so we can manipulate it later
    textView = (TextView) findViewById(R.id.text_view);
}

// This callback is called only when there is a saved instance that is previously saved by using
// onSaveInstanceState(). We restore some state in onCreate(), while we can optionally restore
// other state here, possibly usable after onStart() has completed.
// The savedInstanceState Bundle is same as the one used in onCreate().
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    textView.setText(savedInstanceState.getString(TEXT_VIEW_KEY));
}

// invoked when the activity may be temporarily destroyed, save the instance state here
@Override
public void onSaveInstanceState(Bundle outState) {
    outState.putString(GAME_STATE_KEY, gameState);
    outState.putString(TEXT_VIEW_KEY, textView.getText());

    // call superclass to save any view hierarchy
    super.onSaveInstanceState(outState);
}

在这里，在

OnSaveInstanceState（Bundle outState）

方法中，为什么超级调用在末尾，为什么函数原型不是这个

OnSaveInstanceState（@NonNull Bundle outState）

。
如果原型是

onSaveInstanceState（@NonNull Bundle outState）

，会发生什么