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

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Q1331. Is Runtime Polymorphism possible without Inheritance ?

Core Java

Ans. Yes, Runtime Polymprohism requires either Class inheritance or Interface implementation.

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Q1332. Is dependency injection possible if we don't have inheritance / Composition ?

Design

Ans. Without composition - No, as it's the core of dependency injection.

With Inheritance - Yes, through interface implementation.

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Q1333. Does Wrapper classes produces immutable objects ?

Core Java

Ans. Yes

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Q1334. Why shouldn't we use string concatenation extensively or in a loop ?

Core Java

Ans. Because String being an immutable object creates a new object upon each concatenation cycle. If there is any such need , we should use String Builder whose objects are mutable.

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Q1335. As root, if you have to assign the owner for the file and set only read permission for the owner, Write a unix command to do it.

Unix

Ans. chmod 477

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Q1336. Write a SQL to remove records with a duplicate field in a Table ?

Database

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Q1337. If a Map needs to be accessed simultaneously by multiple threads, which collection class should be used ?

Core Java

Ans. ConcurrentHashMap

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Q1338. Given a collection of Employee objects, how can we get the customers with name starting with 'A' using lambda expression.

Core Java

Ans. List emp = Arrays.asList("American", "Indian", "Finn");
emp.stream().filter(em -> em.startsWith("A")).forEach(System.out.println);

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Q1339. What is the difference between stream and parallel stream ?

Core Java

Ans. streams are used for sequential processing of data and parallel streams are used for parallel processing of data (only if the underlying processor is multicore).

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Q1340. Difference between stateless and stateful rest services ?

Rest

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Q1341. What are the advantage of Abstract classes over interfaces with respect to Java 7 ? and What changed in Java 8 to help facilitate that in Java 8 ?

Core Java

Ans. Abstract Classes provide default implementations of methods that are inherited by the classes that extend them, which was not the case for Interfaces. This changed in Java 8, where default implementations are provided for methods.

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Q1342. Explain Hibernate Validation ?

Hibernate

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Q1343. Which validation frameworks have you worked on ?

Frameworks

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Q1344. How different is the Search algorithm when we query Cassandra Tables and When we query Oracle Tables ?

Cassandra

Ans. Relational Database uses linear search if we don't query using indices. Performance for linear search is O(n). If indices have been used , relational database uses binary search. Performance for binary search is O(Log n).

Casandra uses hash search. Performance for Hash Search is O(1).

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Q1345. Difference between Normalization and Denormalization ?

Database

Ans. Normalization is the process of splitting one Table into multiple so as to avoid Data duplication whereas Denormalization is the process of reducing Tables that creates data duplication but would remove joins in the queries.

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Q1346. Which of the two Normalization / Denormalization facilitate better performance ? Which of the two facilitate better space management ?

Database

Ans. DeNormalization facilitate better performance. Normalization remove data duplication and hence facilitate better database space management.

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Q1347. Which of the following databases - Cassandra / Oracle - provides more flexibility about querying the database ?

Database

Ans. Oracle as it is not modeled for a particular query or set of queries.

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Q1348. What could be the driving force to have dependencies injected through class than through config file while using IOC or Dependency Injection ?

Design

Ans. Unit Testing

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Q1349. Which is the best NoSql Database for Performance ?

NoSql

Ans. Possible Answer - doument base - monogodb

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Q1350. Why do we use Thread Class as well as Runnable Interface for creating threads in Java ?

Core Java

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Q1351. Why can we have a static inner class but not a static Top level class in Java ?

Core Java

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Q1352. If a team member send you the code for review which you don't agree to but is just slightly off , Would you approve it or reject it ?

General

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Q1353. How do you keep yourself aupdated with the changes in technologies ?

General

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Q1354. Write a SQL to find 2nd Max value in a Table.

Database

Ans. SELECT MIN(FIELD) FROM (SELECT TOP 2 FIELD FROM TABLE ORDER BY FIELD DESC)

or

SELECT MAX(FIELD) FROM TABLE WHERE FIELD NOT IN (SELECT MAX(FIELD) FROM TABLE)

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Q1355. How would you describe your current or previous Boss ?

General

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Q1356. What do you do when told to do something that you don't agree with?

General

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Q1357. Can we use primitive types with Collection classes ?

Core Java

Ans. No, As collection classes involve use of Generics, they cannot accept primitive types.

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Q1358. Is immutability an advantage with Wrapper classes over primitive types ?

Core Java

Ans. There is no concept of de referencing with primitive types and hence they are implicitly immutable. Having wrapper classes as mutable offers disadvantages compared to primitive types. Wrapper classes being immutable offer similar advantage as primitive types.It actually overshadows the disadvantage wrapper class could have if they are immutable.

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Q1359. Do we have Integer constant pool of primitive int or Integer objects ?

Core Java

Ans. It's of Integer objects and not primitive int.

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Q1360. Write a SQL to find max salary by Dept

SQL

Ans. SELECT MAX(SALARY),DEPT FROM EMPLOYEE GROUP BY DEPT

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