Question

I would expect subclass always call super() for some method.
How can I enforce or at least give a warning at compile time?

Thanks

Answer 1

I think that Chris White‘s answer is best in the general case. But chen ying’s comment “I know enforcing to call super is not good. But I did not own the super class. And SDK documentation requires to call super. for example link” suggests that it is not suitable in this particular instance.

I would thus suggest modifying Chris White’s answer to meet the particulars.

class ChenYingTestCase extends ServiceTestCase
{
       /**
        * Gets the current system context and stores it.
        * You can not extend this method.
        * If you want to achieve the effect of extending this method,
        * you must override chenYingSetupMethod.
        **/
       public final void setUp ( )
       {
             super.setUp ( ) ;
             chenYingSetup ( ) ;
       }

       /**
        * Does nothing (unless you extend it)
        *
        * Extend this method to do your 
        * own test initialization. If you do so, there is no need to call super.setUp() 
        * Hint:  calling super.setUp() is probably a bad idea.
        * as the first statement in your override.
        * Just put your test initialization here.
        * The real SetUp method will call super.setUp() and then this method.
        **/
       protected void chenYingSetUp ( )
       {
       }
}

Then if a subclass is under your control make it a subclass of ChenYingTestCase. If the subclass is not under you control, well you can’t really force it to call super().