When I make a new Android Application Project 
I see the automatic generate MainActivity.java file.
Why was the "OnCreate" protected
I remember this was private. I don't understand. why made this?
For example this:
public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
}
 
     
     
    