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

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Q121. Write a Program to draw a fish ?

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Q122. Should we do anything to avoid memory leaks in Java ?

Core Java

Ans. Java has a intrinsic way of checking leaks and reclaiming memory called garbage collection. Moreover Java doesn't support pointer arithmetics , so there is very low comparative chance of memory leaks, compared to C,C++

Though there may be tools that may audit code to make sure that we are not leaving much for the garbage collection to work but I have never heard anyone doing anything for memory leaks in Java.

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Q123. Have you ever worked on Google Cloud Platform ?

Google Cloud Platform

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Q124. differences between drop , delete and truncate

Database

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Q125. How to deploy spring boot application without restart in prod env

Spring Boot

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Q126. Hash map using/without using Java 8

Core Java

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Q127. Rest API crud operation using spring boot

Spring Boot

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Q128. What is difference between Echo and Print ?

Ans. echo and print statements both are similar there is a slight difference between those both are output statements echo has no return value while print has value 1 echo takes multiple parameters but print takes one argument

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Q129. How do you use cut command in unix ?

Unix

Ans. cut command is used to extract the given number of characters and columns from a file

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Q130. What is Throwable ?

Core Java

Ans. Throwable in java is a class that is the superclass of all exceptions and errors which may occurs in java program.It extends obcect class.

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Q131. How to delete a node from linked list if u do not have head and only have a pointer to the element which has to be removed ?

Data Structure

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Q132. What are the scenarios you consider in code reviews

General

Ans. https://www.evoketechnologies.com/blog/code-review-checklist-perform-effective-code-reviews/

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Q133. All the meaningful words that can be formed from a phone keypad

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Q134. What is the use of toString method ?

Core Java

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Q135. What is ado.net ?

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Q136. What is a composite primary key and foreign key ?

Database

Ans. The combination of values from multiple columns in the composite primary key must be unique for each row in the table.
A foreign key, on the other hand, is a field or set of fields in one table that refers to the primary key in another table. It establishes a relationship between two tables based on the values of the foreign key and the primary key.

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Q137. What is java machine control

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Q138. what is green threads

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Q139. what is dynamic method dispatch

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Q140. What is SNMP ?

Networking

Ans. SNMP or Simple Network Management protocol is an application layer protocol for exchanging management information between network devices.

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Q141. If you are given choice to either load object eagerly or lazily , which one would you use in case of singleton pattern ?

Design

Ans. I would choose Eager as the cost for 1 additional object is too minute for any such consideration.

Eager Loading results in Faster access ( Object available at load time) at the cost of additional space.

Lazy loading results in space saving ( Object available at first use ) at the cost of access speed.

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Q142. What can be done to protect the application from DDOS attack ?

Security

Ans. We can set the max number of requests from a given IP or an IP range

We can set the time out so that a single request cannot hold on to resources for too long.

We can identify patterns ( like too many requests from single IP for single page ) and then block such requests.

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Q143. how to switch to the parent webpage?

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Q144. What is the programming language used to build Jenkins?

Jenkins

Ans. There is a diverse set of programming languages used in Jenkins, including but not limited to: Java, JavaScript, Groovy, Golang, Ruby, Shell scripts

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Q145. Difference between merge and update in hibernate

Hibernate

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Q146. Explain switch and router

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Q147. What are the types of clouds in cloud computing ?

Cloud Computing

Ans. Private, Public, Hybrid, Community

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Q148. What is headless mode in Java ? Why is it used ?

Core Java

Ans. It’s a mode that can be used for creating Back end application without the front end UI.

The advantage is that it reduces the number of packages that needs to be loaded ( by ignoring ui packages )

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Q149. Write a code to detect the longest palindromic substring

Core Java

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Q150. Write a program to make a triangle of stars.

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