OOPs INTERVIEW QUESTION & ANSWERS
| 56. |
What are methods? |
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- Methods are the building blocks of a class, in which they are linked together to share and process data to produce the result.
- Method is a block of code that contains a series of statements.
- A method represents a behavior of a class.
- Methods are declared in a class or a structure by specifying the access level, the return value, the name of the method, and the method parameters.
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| 57. |
What is an ArrayList? |
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The ArrayList object is a collection of items containing a single data type values. |
| 58. |
What are the significant features of an interface? |
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- An interface is declared by using the Interface keyword.
- An interface is used to apply multiple inheritance in code.
- An interface is a template that contains only the signature of methods.
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| 59. |
What are constructors and destructors? |
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- Constructors and destructors are special methods of every class.
- Each class has its own constructor and destructor and are called automatically when the instance of a class is created or destroyed.
- The constructor initializes all class members whenever you access the class and the destructor
destroys them when the objects are not required anymore.
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| 60. |
What is meant by data encapsulation? |
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Data encapsulation, also referred to as data hiding, is the mechanism whereby the implementation details of a class are kept hidden from the user. The user can only perform a restricted set of operations on the hidden members of the class by executing special functions called methods. |
