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Interview Questions and Answers - Order By Rating

Q421. What is object slicing ?

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Q422. What is something faulty about java ?

Core Java

Ans. Not purely object oriented Language.

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Q423. Can we have more than two constructors in a class ?

Core Java

Ans. Yes, through constructor overloading

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Q424. If we have a return statement inside the finally block, Then what will happen ?

Core Java

Ans. Returning from inside a finally block will cause exceptions to be lost. A return statement inside a finally block will cause any exception that might be thrown in the try block to be discarded.

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Q425. What is the concept of hibernate versioning ?

Hibernate

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Q426. What is cluster ?

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Q427. What do you think is the best advantage of using Dojo over other front end frameworks ?

Dojo

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Q428. Which of the following front end frameworks , Angular , React, Vue , Ext JS and Dojo; you like the most and why ?

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Q429. What are the challenges you have faced while working on Dojo ?

Dojo

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Q430. Sort an Employee Object based on Name or Age

Database

Ans. Use Comparable or Comparator interface

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Q431. how hashmap work? Write a program that uses map interface ?

Core Java

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Q432. If you are asked to test an application without any documentation, What type of testing will you do ?

Testing

Ans. White Box Testing
Unit Testing
Ad Hoc Testing

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Q433. Can we have two interfaces having method with same name and arguments?

Core Java

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Q434. What is xssf and hssf ?

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Q435. Can we load environment variables into Properties in Java ? How ?

Core Java

Ans. Yes

new Properties().putAll(System.getenv());

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Q436. Difference between System.getEnv and System.getProperties ?

Core Java

Ans. System.getEnv gets the environment variables where System.getProperties gets Java properties.

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Q437. Difference between HashMap and Dictionary in Java ?

Core Java

Ans. HashMap implements the Map interface while the Dictionary does not.

HashMap was introduced after HashTable and Dictionary.

Dictionary is currently obsolete in java.

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Q438. Difference between TreeMap and SortedMap ?

Core Java

Ans. sortedMap is an interface ,while TreeMap is an implementation of sortMap.

We can not create an instance of sortedMap but we can create an instance of treeMap

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Q439. Difference between ArrayList and HashSet ?

Core Java

Ans. ArrayList is a list , i.e an implementation of List interface whereas HashSet is a Set and an implementation of Set interface.

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Q440. difference between ArrayList and array ?

Core Java

Ans. ArrayList is a variable length collection class whereas arrays are fixed length primitive structure.

We can use generics with arraylist but not with arrays.

We can store primitive data types within arrays but can't with ArrayList. In ArrayList that needs to be converted to Wrapper objects.

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Q441. Difference between ArrayList and Vector ?

Core Java

Ans. Vector is Synchronized one where as Arraylist is not Synchronized.

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Q442. How can we run a java program through command line ?

Core Java

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Q443. What is the difference between final and static in java ?

Core Java

Ans. final keyword is used to restrict the user from modifying the variable, extending the class and overriding a method

static keyword is used for memory management which can be used for variable, class, method where in it belongs to the class not to the instance of object

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Q444. What is the difference between final and constant in java ?

Amazon Web Services (AWS)

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Q445. What is the difference between Encapsulation and encryption ?

Networking

Ans. Encapsulation is the process of wrapping the data with another layer to be transported across the network with the source and destination details on just like the analogy of wrapping letter in envelope with the source and destination details on the envelope. Encryption on the other hand is the process of hashing text or transforming the data in a form that is not readable except you have access to the key use to decrypt it.

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Q446. Does garbage collection call dispose ?

Core Java

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Q447. Does garbage collection happens in String pool ?

Core Java

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Q448. Does garbage collection affects performance of the application ?

Core Java

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Q449. Difference between composition and aggregation in java ?

Core Java

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Q450. Why is String a class in Java ?

Core Java

Ans. 1. Creating a class helps in specifying operations on the Strings like length , sub string , concatenation etc.

2. It acts as a Wrapper class for "Array of Characters" and hence facilitates it's usage in collections, assignment to null.

3. Immutability of String objects facilitates in reuse , security and caching.

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