overriding

Whenever i override a method of a base class, other than my implementation of this method, i seem to have 3 choices. 1) Call base.Method(), and then provide my implementation. 2) Provide my implementation and then call base.Method() 3) Just provide my implementation. Recently while using a library i have realized few bugs that were introduced because of not implementing the method as expected by the library. I am not sure if that is bad on part of library, or something wrong in my understanding. I will take one example. public class ViewManager { public virtual void Customize(){

How can I go about making a child class override a privileged method of a base class? If its not possible, is there another way to achieve what I am trying to accomplish in the simple code example below? I cannot convert the baseclass function parseXML() to public because it requires access to private variables function BaseClass() { var map = {}; // I cannot make this function public BECAUSE it accesses & changes private variables this.parseXML = function( key, value ) { alert("BaseClass::parseXML()"); map[key] = value; } } function ChildClass() { BaseClass.call(this); this.parseXML =

I created an app that supports both phone and tablet version so i use the android-support-v4.jar library. My activity extends the ListFragment and I tried to override the onCreateOptionsMenu(Menu menu, MenuInflater inflater), as in the following link: http://developer.android.com/resources/samples/Support4Demos/src/com/example/android/supportv4/app/FragmentMenuSupport.html I previously called setHasOptionsMenu. Unfortunately, it seems that I cannot override onCreateOptionsMenu(). This is the error message: The method onCreateOptionsMenu(Menu menu, MenuInflater inflater) of type MyFragment must

Possible Duplicate: When do you use Java’s @Override annotation and why? Is there any reason to annotate a method with @Override other than to have the compiler check that the superclass has that method? As you describe, @Override creates a compile-time check that a method is being overridden. This is very useful to make sure you do not have a silly signature issue when trying to override. For example, I have seen the following error: public class Foo { private String id; public boolean equals(Foo f) { return id.equals(f.id);} } This class compiles as written, but adding the @Override tag to

Why do I get the error below? How to workaround it? I assumed that since A and B compile to (interface,class) pairs, it's a matter of choosing the right static method call to implement when compiling C. I would expect the priority to be according to order. scala> trait A { def hi = println("A") } defined trait A scala> trait B { def hi = println("B") } defined trait B scala> class C extends B with A <console>:6: error: error overriding method hi in trait B of type => Unit; method hi in trait A of type => Unit needs `override' modifier class C extends B with A scala> trait A { override def hi =