Cannot see Options Menu in Android

I am trying to create a menu demo, but I am unable to see the menu. The only thing I can see is the "TextView" view in the layout. Below is the code:

menu.xml in (res\menu)

<?xml version="1.0" encoding="utf-8"?>
<menu
  xmlns:android="http://schemas.android.com/apk/res/android">
    <group android:checkableBehavior="single">
    <item 
    android:title="@string/new_game" 
    android:id="@+id/new_game">
    </item>
    <item 
    android:title="@string/quit" 
    android:id="@+id/quit"
    >
    </item>
    </group>
</menu>

demomenu.java

package com.test.demomenu;

import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.Toast;


public class demomenu extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        //super.onCreateOptionsMenu(menu);
        MenuInflater inflater=getMenuInflater();
        inflater.inflate(R.menu.game_menu, menu);
        return true;
                
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        Toast.makeText(this, "This is the item", Toast.LENGTH_LONG).show();
        return true;
        
    }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

strings.xml

    <?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, demomenu!</string>
    <string name="app_name">Demo Menu</string>
    <string name="new_game">New Game</string>
    <string name="quit">Quit</string>
</resources>

When I run the project, I can only see the "TextView" and not the menu. I would appreciate it if someone can tell me what is wrong with the application.

I don't think you can have checkable items in an options menu. The documentation states:

Options menus: The icon menus do not support item check marks...

Try removing the group tag and see if the menu will display.