What is the difference between and interface and an
abstract class ?
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Answer Posted / porchelvi
ABTRACT CLASS
*************
• It can not be instantiated
• It allow us to specify all access modifier except
Private
• A class inheriting this must implement all of its
abstract method
• A class can inherit only one abstract class at a
time.
• Abstract class can add more functionality with out
destroying child classes that were using old version.
• We can declare the following
1. Fields
2. Constructors
3. Static Constructors
4. Static Functions
5. Concrete Functions
INTERFACE
*********
• It can not be instantiated
• It allows only public Access modifier
• A class implementing interface must provide body
for its entire member.
• A class can implement more than one interface at a
time.
• Adding of additional functionality will have an
effect on its child class due to the necessary
implementation of interface methods.
• We can not declare the following
1. Fields
2. Constructors
3. Static Constructors
4. Static Functions
5. Concrete Functions
| Is This Answer Correct ? | 11 Yes | 2 No |
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Question In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Question Submitted By :: Sunil Kumar I also faced this Question!! Rank Answer Posted By Re: In a class, there is a reference or pointer of an object of another class embedded, and the memory is either allocated or assigned to the new object created for this class. In the constructor, parameters are passed to initialize the data members and the embedded object reference to get inialized. What measures or design change should be advised for proper destruction and avioding memory leaks, getting pointers dangling for the embedded object memory allocation? Please suggest. Answer # 1 use copy constructors 0 Shanthila There is something to be taken care in destructor, in copy constructor, suppose the memory is assigned to the embedded member object pointer with the parameter passed value, but if some other objects of different class also are pointing to this memory, then if some one deletes the object then this class member pointer object will become dangling, or if the object is not deleted properly then there will be memory leak. Please suggest the design change required to handle or avoid this situation
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