Interview prep
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| OOP Object Oriented Programming | show 🗑
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| show | Attributes and methods defining an Object
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| Object | show 🗑
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| show | Polymorphism
Inheritance
Abstraction
Encapsulation
+Aggreagation
+Composition
+Association
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| Polymorphism | show 🗑
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| show | allows a Child class to inherit properties from its parent class
extends keyword
Only properties with access modifier public and protected can be accessed in child class.
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| Abstraction | show 🗑
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| Encapsulation | show 🗑
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| Aggreagation | show 🗑
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| Composition | show 🗑
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| Association | show 🗑
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| show | compile time polymorphism
same name but different method signature or different number or type of parameters.
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| show | runtime polymorphism
method in a child class has the same name and signature as a method in the parent class.
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| show | If a child class inherits the property from multiple classes
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| show | No.
at runtime it becomes difficult for the compiler to decide which method to execute from the child class.
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| difference between polymorphism and inheritance? | show 🗑
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| does java support multiple inheritance of interface? | show 🗑
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| show | ambiguity where the compiler doesn't know which superclass method to execute
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| Interface | show 🗑
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| abstract class | show 🗑
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| show | Private: inside the class
Protected: same package, or diff pkg if the class extends the main class
Default: only accessible in the same package
Public: accessible from a diff pkg
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| final keyword | show 🗑
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| show | Only one thread at a time can access synchronized methods
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| show | Multiples objects of a class shares the same instance of a static variable.
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| show | can be accessed without creating the objects
can only access static variables and not local or global non-static variables
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| Static class | show 🗑
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| show | used to throw the exception manually
subclass of Throwable.
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| show | Java Development Kit: software development tools
Java Runtime Environment: Library and classes, env to execute Java applications
Java Virtual Machine: Runtime Instance
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