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Livecoding.tv Quiz of the Day: 17/10/2016

java-quiz-of-the-day-1

Answer:

1. Encapsulation

  • Encapsulation is a mechanism by which developer could hide implementation behind an interface.
  • Encapsulated code has two features:
    • Instance variables are kept protected (usually with the private modifier).
    • Getter and setter methods provide access to instance variables.
  • Kindly take a look at tutorial: Complete End to End working Encapsulation example
    • The public setName() and getName() methods are the access points of the instance variables.

2. Inheritance

  • Inheritance allows a class to be a subclass of a superclass, and thereby inherit public and protected variables and methods of the superclass.
  • Inheritance is a key concept that underlies polymorphism, overriding, overloading and casting.

3. Polymorphism

  • Polymorphism means “many forms.”
  • A reference variable is always of a single, unchangeable type, but it can refer to a subtype object.
  • A single object can be referred to by reference variables of many different types —as long as they are the same type or a supertype of the object.
  • Polymorphic method invocations apply only to overridden instance methods.

If you want to explore more, visit our Java edu & tutorials section! Below are some examples:


You can also follow some of the broadcasters who program in Java, like the ones below:

wurgutWurgut

manbearpig1ManBearPig1

Another cool way to find out interesting things about Java is to access our project page!

About author

About Author Dr. Michael Jurgen Garbade is the founder of LiveEdu.TV, Kyuda, Education Ecosystem. He is future Venture Capitalist, Future Politician and always on the lookout for the Next Big Challenge. Obtained Masters in business administration and physics, and a Ph.D. in finance with professional work experience in high-paced environments at Fortune 500 companies like Amazon and General Electric. Expertize: Python, PHP, Sencha Touch & C++, SEO, Finance, Strategy & E-commerce. He speaks English and German and has worked in the US, Europe, and Asia. At Education Ecosystem he is the CEO and runs business operations.
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