Interview Questions and Answers for 'Ide' | Search Interview Question

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Q41. Is it a good practice to override static methods ?

Ans. Though it's useful but it's not as useful as overriding member or object methods. We cannot achieve polymorphic behavior with static methods by overriding their definition in derived class.

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Q42. Is synchronized a keyword , modifier, identifier? what is it ?

Core Java

Ans. synchronized is a keyword and a modifier. The synchronized keyword is used to indicate that a method can be accessed exclusively by one thread at a time.

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Q43. What is a difference between Identifier and keyword ?

Core Java

Ans. Keyword is a reserved word that has a pre defined meaning for the compiler and hence cannot be used as an identifier, for example - final, private , for etc.

Identifier is the name given by the programmer to a programming construct, for example - class and method names etc.

java Keywords cannot be used as an identifier in java.

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Q44. Can we use java keywords as identifiers ?

Core Java

Ans. No, keyword has pre defined meaning for compiler and hence cannot be used as identifiers.

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Q45. Can we use true and false as identifiers in java ? Are they keywords in Java ?

Core Java

Ans. true and false are literals in java. No we cannot use them as identifiers.

Sample Code for literal

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Q46. What is widening and narrowing conversion in Java ?

Core Java

Ans. Conversion means that the expression / literal / value of one type getting converted to other type.

Widening conversion is the conversion from Type A to Type B where B requires a wider space than A. For example - int to long, float to double, char to String etc. As the value moves to a wider space, there is no loss of information.

Narrowing conversion is the conversion from Type A to Type B where B requires a narrower space space than A. For example - int to long, float to double, char to String etc.As the value moves to a narrower space, there is a loss of information.

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Q47. Can you write the code for implementing the one to many (student -> courses) relationship in hibernate?

Hibernate

Ans. @OneToMany(cascade = CascadeType.ALL)
@JoinColumn(name = "student_id")
private Set countries;

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Q48. Can you explain software design principles cohesion and coupling with an example?

Design

^{This question was recently asked at 'Fidelity Information Services (FIS)'.This question is still unanswered. Can you please provide an answer.}

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Q49. What is Method overloading ?

Core Java

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Q50. Implement a sparse matrix Java class with a constructor, set and get method.

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Q51. Write code to sort an array.

Algorithm

Ans. https://www.geeksforgeeks.org/arrays-sort-in-java-with-examples/

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Q52. What sets you apart from other developers ?

or

What are the distinguished qualities you have ?

General

Ans. https://blog.timesunion.com/careers/the-10-most-important-personality-traits-for-career-success/633/

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Q53. What is the purpose of doing mvn eclipse:eclipse or man idea:idea

Maven

Ans. It is an instruction to maven to set up files ( class path , project ) within the IDE

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Q54. How can we request maven to set up class path within the IDE

Maven

Ans. We can do mvn eclipse:eclipse or mvn idea:idea depending on the type of IDE

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Q55. What are the different ways to create objects in Java ?

Core Java

Ans. 1. Using new operator
3. Using Class.forName or Reflection
4. Using clone
5. Using Deserialization

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Q56. What is cluster ?

^{This question was recently asked at 'idealake information technologies'.This question is still unanswered. Can you please provide an answer.}

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Q57. Give an example of a time when you recommended code changes in a code review that simplified the code ?

Code Review

Ans. If there is a situation to remove duplicates values from an arrayList. Developer implemented using legacy for-loop where I suggested to use Linked hash set to remove duplicates from the list.

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Q58. Interface vs Abstraction

Core Java

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