Option Menu in Android

menu.xml :

< ?xml version="1.0" encoding="utf-8"?> 
< menu  xmlns:android="http://schemas.android.com/apk/res/android"> 
 < item android:id="@+id/item1" android:title="Option 1"
                                   android:icon="@android:drawable/ic_menu_compass"/> 
 < item android:id="@+id/item2" android:title="Option 2"
                                   android:icon="@android:drawable/ic_menu_week"/> 
 < item android:id="@+id/item3" android:title="Option 3" 
                                   android:icon="@android:drawable/ic_menu_call"/> 
 < item android:id="@+id/item4" android:title="Option 4"
                                   android:icon="@android:drawable/ic_menu_zoom"/> 
< /menu> 

Click on the menu button to open this menu
in java class :

public class OptionMenuActivity 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) {
    // TODO Auto-generated method stub
      MenuInflater inflater=getMenuInflater();
      inflater.inflate(R.layout.menu,menu);
      return super.onCreateOptionsMenu(menu);
}
  @Override
public boolean onOptionsItemSelected(MenuItem item) {
    // TODO Auto-generated method stub
      if(item.getItemId()==R.id.item1)
      {
          Log.d("option","Option 1 was clicked");
      }
      if(item.getItemId()==R.id.item2)
      {
          System.out.println("item2 selected");
      }
      if(item.getItemId()==R.id.item3)
      {
          System.out.println("item3 selected");
      }
      if(item.getItemId()==R.id.item4)
      {
          System.out.println("item4 selected");
      }
    return super.onOptionsItemSelected(item);
}
}