TO THE NEW Full Stack Developer Interview Questions and Answers

Q1. Java 8 spring boot question
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Q2. Problem solving in java 8
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Q1. Based on the project you worked on
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Q2. Problem solving in java and ds
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Q1. Cycle sort based question
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Q2. Streams api, optional, lambda implementation
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Q3. Hashmap iteration ways
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There are multiple ways to iterate over a HashMap in Java.
• Using keySet() and values() methods

• Using entrySet() method

• Using forEach() method with lambda expression
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Q4. Method overriding based code question -> guess the output
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Method overriding in Java with code example
• Output will be 'Child class method' as the method in Child class overrides the method in Parent class

• Method overriding is a feature that allows a subclass to provide a specific implementation of a method that is already provided by its superclass

• The method in the subclass should have the same name, return type, and parameters as the method in the superclass
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Q5. Write API to save data
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API to save data in Java
• Use HTTP POST method to send data to the server

• Create a RESTful endpoint to handle the data saving

• Validate the input data before saving it to the database
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Q1. Angular basics regarding lifecycle hooks, rxjs, data bindingetc
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Q2. Coding to find the common characters comparing 3 strings
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Finding common characters in 3 strings using coding
• Create a function that takes in 3 strings as input

• Iterate through each character of the first string and check if it exists in the other 2 strings

• Store the common characters in an array and return it
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Q1. Fetch all the duplicate values from an array
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To fetch all duplicate values from an array of strings
• Iterate through the array and store each element in a HashSet

• If an element is already in the HashSet, it is a duplicate value

• Add the duplicate values to a separate list and return it
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Q2. Java 8 streams api
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Contiguous array in java

Q1. Microservices architecture
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Q2. Saga design pattern
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Q1. Display a list of items using Pagination concept in React using any online coding editor.
Ans. 
Display a list of items using Pagination concept in React
• Create a list of items to display

• Implement pagination logic to display a limited number of items per page

• Add navigation buttons to switch between pages
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Q2. Check if pair sum exists in the array (Two Sum)?
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Check if pair sum exists in the array using a hash map.
• Use a hash map to store the difference between the target sum and each element in the array.

• Iterate through the array and check if the current element exists in the hash map.

• Return true if a pair sum exists, otherwise return false.
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Q3. React LifeCycle?
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Q4. How do you improve the performance of a website?
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Improving website performance involves optimizing code, reducing server requests, using caching, and optimizing images.
• Optimize code by minifying CSS, JavaScript, and HTML

• Reduce server requests by combining files and using asynchronous loading

• Utilize caching techniques like browser caching and server-side caching

• Optimize images by resizing, compressing, and using modern image formats like WebP
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Q5. What is NextJS?
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NextJS is a React framework that allows for server-side rendering and static site generation.
• NextJS is built on top of React, providing features like server-side rendering and static site generation.

• It simplifies the process of building React applications by handling routing, code splitting, and more out of the box.

• NextJS also supports API routes for serverless functions and data fetching.

• It offers features like automa...read more
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Construct binary tree from expression

Q1. Microservices patterns
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Q2. Circuit breaker
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Topics covered DSA and Javascript