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

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Q181. Which source code management do you use and what do you dislike the most about it ?

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Q182. JWT internal working

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Q183. Which interface is used for hashset implementation ?

Core Java

Ans. HashSet implements Set interface.

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Q184. Difference between injection and auto wiring.

Spring

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Q185. why string pool concept for only String but not for StringBuffer ?

Core Java

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Q186. why string pool concept for only String but not for StringBuffer ?

Core Java

Ans. As String is immutable so by maintaining pool area we can refer the object to same area if they are with same content. But when it comes to string buffer or builder then due to mutable property if we do so then all the objects referring to that area will from now has new content.. So as to avoid this pool is present only in string.

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Q187. Explain your project details.

General

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Q188. SQL Questions.

Database

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Q189. Linked List related questions.

Data Structure

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Q190. What is runtime Polymorphism ?

Design

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Q191. Can you give me a use case where you utilized serialization in your project code?

Core Java

Ans. we use serialization when we send response to client in JSON format.(the process of converting model object into json is nothing but serialization

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Q192. Difference between Query param and path param ?

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Q193. Write SQL query to join 2 tables ?

SQL

Ans. Select * from table1 join Select * from table2

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Q194. Can you tell us a use case of reflection in java that you have applied ?

Design

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Q195. Give specific situation about when to go for constructor based injection and setter based injection in spring.

Spring

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Q196. Write program to recursively iterate through map ?

Core Java

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Q197. When singleton can break and how to resolve it

Design

Ans. Deserialization. In serialization, we can save the object of a byte stream into a file or send over a network. Suppose if you serialize the Singleton class, and then again de-serialize that object, it will create a new instance, hence deserialization will break the Singleton pattern.

To overcome this issue, we need to override readResolve() method in the Singleton class and return the same Singleton instance.

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Q198. Difference between interface and inheritance

Core Java

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Q199. Combine and join integer and string list to single list and sort.

Core Java

Ans. Object[] combined = new Object[first.length second.length];
System.arraycopy(first, 0, combined, 0, first.length);
System.arraycopy(second, 0, combined, first.length, second.length);

-- OR --

Object[] combined = Stream.concat(Arrays.stream(first), Arrays.stream(second)).toArray();

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Q200. Details of networking apis supported by java.

Ans. retrofit 2, volly and OkHttp

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Q201. What are the 22 possible values of x where x== -x (true) ?

Core Java

Ans. byte x = 0;
short x = 0;
char x = 0;
int x = 0;
int x = Integer.MIN_VALUE;
float x = 0.0f;
float x = -0.0f;
long x = 0;
long x = Long.MIN_VALUE;
double x = 0.0;
double x = -0.0;
Byte x = 0;
Short x = 0;
Character x = 0;
Integer x = 0;
Integer x = Integer.MIN_VALUE;
Float x = 0.0f;
Float x = -0.0f;
Long x = 0L;
Long x = Long.MIN_VALUE;
Double x = 0.0;
Double x = -0.0;

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Q202. What are the limitations of Java ?

General

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Q203. Can we have more than two constructors in a class ?

Core Java

Ans. Yes, through constructor overloading

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Q204. 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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Q205. What is the concept of hibernate versioning ?

Hibernate

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Q206. What is cluster ?

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Q207. Sort an Employee Object based on Name or Age

Database

Ans. Use Comparable or Comparator interface

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Q208. Can we load environment variables into Properties in Java ? How ?

Core Java

Ans. Yes

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

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Q209. 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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Q210. 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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