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Interview Questions and Answers for 'Yodle' - 3 question(s) found - Order By Newest

Frequently asked to fresh graduates and less experienced developers. Among the first few questions in many interviews.
  Q1. What are the difference between composition and inheritance in Java?Core Java
Ans. Composition - has-a relationship between objects.
Inheritance - is-a relationship between classes.

Composition - Composing object holds a reference to composed objects and hence relationship is loosely bound.
Inheritance - Derived object carries the base class definition in itself and hence its tightly bound.

Composition - Used in Dependency Injection
Inheritance - Used in Runtime Polymorphism

Composition - Single class objects can be composed within multiple classes.
Inheritance - Single class can only inherit 1 Class.

Composition - Its the relationship between objects.
Inheritance - Its the relationship between classes.

  Sample Code for inheritance

  Sample Code for composition

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   Like         Discuss         Correct / Improve     java   java concepts   inheritance  object oriented programming (oops)  oops concepts   composition  object oriented programming (oops)  oops concepts   inheritance  object oriented programming (oops)  inheritance vs composition  object oriented programming (oops)  oops concepts     Asked in 29 Companies      basic        frequent

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Related Questions

  Difference between Composition and Inheritance ?
 Which of the following Java feature promotes access protection or Hiding ?

a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
  Which of the following is tightly bound ? Inheritance or Composition ?
  Can we compose the Parent Class object like this ?
 Does use of Final class enforces composition over Inheritance in Java ?
 Which of the following Java features facilitates Dependency Injection - Inheritance or Composition ?
 How are the concept of Association related to Composition and Inheritance ?
 Is dependency injection possible if we don't have inheritance / Composition ?
 What is composition ?


Frequently asked at Manhattan Associates ( Based on 2 feedback )
  Q2. What is a Lambda Expression ? What's its use ?Core Java
Ans. Its an anonymous method without any declaration.

Lambda Expression are useful to write shorthand Code and hence saves the effort of writing lengthy Code.

It promotes Developer productivity, Better Readable and Reliable code.

  Sample Code for lambda

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   Like         Discuss         Correct / Improve     java   java8   lambda expression   architecture     Asked in 58 Companies      expert        frequent

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Related Questions

  Difference between final and effectively final ? Why is effectively final even required ?
  Difference between Predicate, Supplier and Consumer ?
 What are the problems one could face while working with serverless technologies like AWS Lambda ?
 How does AWS Lambda handle failure during event processing?
 Can you explain the integration between API Gateway and Lambda if we wish to develop services using these tools.
 What would you do if you see an error thrown by a lambda function as "Access Denied" while doing something with S3 ?
 What are the advantages and disadvantages of using Lambda over EC2 ?
 What are the different trigger types in AWS Lambda ?
  What does the following lambda expression means ?


  Q3. What is database Normalization ?Database
Ans. https://en.wikipedia.org/wiki/Database_normalization

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   Like         Discuss         Correct / Improve     normalization  database     Asked in 35 Companies      intermediate        frequent


Related Questions

 Difference between Normalization and Denormalization ?
 Which of the two Normalization / Denormalization facilitate better performance ? Which of the two facilitate better space management ?



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