1. Polymorphism
2. Inheritance
3. Encapsulation
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Showing posts with label Oops. Show all posts
Showing posts with label Oops. Show all posts
What is a Class ?
Class:
It defines characteristics of a thing and its behavior. It is blueprint based on which objects are created.
Example: Employee (which will have all the details about the employee like name, id, salary, etc and the methods which describes his behavior like calcSalary(),displaydetails(),etc.
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What is an Object ?
Is an instance of a class. It will be exactly the same as a class but can be assigned values and used whereas a class can’t be used without creating objects.
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What is Inheritance ?
A feature in which the base class’s characteristics and behavior are derived to the child class also.
What is Multilevel Inheritance ?
classes inherits from parent classes in multiple level, ie Child inherits from Parent and grandchild classes inherit from Child , like that.
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What is Hybrid Inheritance ?
A class inherits from more than one type of Inheritances mentioned above.
Ex:
It inherits from multiple and also multilevel
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What is Polymorphism ?
A feature using which more than one definition is given to a single method or operator.
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What is Association ?
Association defines a relationship between classes of objects which allows one object to cause another to perform an action on its behalf.
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What is Composition ?
Composition is a way to combine simple objects or data types into more complex ones.
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What is Aggregation ?
Aggregation is a form of composition where one looks at the system as a whole rather than as parts.
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What are the different ways a method can be overloaded ?
1. With different number of arguments
2. With different datatypes of arguments
3. With different order of arguments
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What is the error that is thrown while a method is written without a return type. ?
Tuesday, August 4, 2009
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