如何强制派生类调用超级方法？（就像Android一样）

Question

我想知道，当创建新Activity类然后覆盖该onCreate()方法时，在eclipse中我总是会自动添加：super.onCreate()。这是怎么发生的？在抽象类或父类中是否有Java关键字会强制这样做？

我不知道不调用父类是否违法，但是我记得在某些方法中，我没有这样做就引发了异常。这也是Java内置的吗？您可以使用某些关键字来做到这一点吗？或如何完成？

Answer 1

这是Activity#onCreate()-几乎所有评论的来源（原始-
参见〜800行
）：

/**
 * Called when the activity is starting.  This is where most initialization
 * should go: calling {@link #setContentView(int)} to inflate the
 * activity's UI, using {@link #findViewById} to programmatically interact
 * with widgets in the UI, calling
 * {@link #managedQuery(android.net.Uri , String[], String, String[], String)} to retrieve
 * cursors for data being displayed, etc.
 *
 * <p>You can call {@link #finish} from within this function, in
 * which case onDestroy() will be immediately called without any of the rest
 * of the activity lifecycle ({@link #onStart}, {@link #onResume},
 * {@link #onPause}, etc) executing.
 *
 * <p><em>Derived classes must call through to the super class's
 * implementation of this method.  If they do not, an exception will be
 * thrown.</em></p>
 *
 * @param savedInstanceState If the activity is being re-initialized after
 *     previously being shut down then this Bundle contains the data it most
 *     recently supplied in {@link #onSaveInstanceState}.  <b><i>Note: Otherwise it is null.</i></b>
 *
 * @see #onStart
 * @see #onSaveInstanceState
 * @see #onRestoreInstanceState
 * @see #onPostCreate
 */
protected void onCreate(Bundle savedInstanceState) {
    mVisibleFromClient = !mWindow.getWindowStyle().getBoolean(
            com.android.internal.R.styleable.Window_windowNoDisplay, false);
    mCalled = true;
}

因此，我的猜测是ADT Eclipse插件会自动super.onCreate()为您添加该调用。不过，这完全是猜测。