Can have mutable fields state?

If an object's fields can change state, the object is considered mutable. If an object's fields can't change state (once the object has been created), it's considered immutable.

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What is an example of immutability?

In some cases, an object is considered immutable even if some internally used attributes change, but the object's state appears unchanging from an external point of view. For example, an object that uses memoization to cache the results of expensive computations could still be considered an immutable object. What is the difference between mutable and immutable data types? To summarise the difference, mutable objects can change their state or contents and immutable objects can't change their state or content. Immutable Objects : These are of in-built types like int, float, bool, string, unicode, tuple. In simple words, an immutable object can't be changed after it is created.

Why is StringBuffer mutable in Java?

Answer: The String class is considered as immutable, so that once it is created a String object cannot be changed. If there is a necessity to make alot of modifications to Strings of characters then StringBuffer should be used. In respect to this, what does a mutable member of a class mean *? Explanation: Mutable members are those which can be updated even if it a member of a constant object. You can change their value even from a constant member function of that class.

What is meant by pure virtual function?

A pure virtual function or pure virtual method is a virtual function that is required to be implemented by a derived class if the derived class is not abstract. Classes containing pure virtual methods are termed ""abstract"" and they cannot be instantiated directly.