OodlesTechnologies Java Developer Interview Questions and Answers

Q1. Oops concept asked
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Q2. Springboot annotations
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Q1. Project details simply
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Q2. Springboot related
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Q1. Easy about salary
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Q2. Details about asked
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There was pattern question in any programming language and you have make the pattern dynamic.

Q1. 1 question on merge sort, 1 question on SQL queries, oops concepts in depth with real-life examples, core java concepts in depth, collection framework.
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Q2. Merge 2 sorted arrays,
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Merge 2 sorted arrays into a single sorted array.
• Create a new array with the combined length of the two input arrays

• Use two pointers to iterate through the two arrays and compare elements to merge them into the new array

• Handle cases where one array is longer than the other
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Q3. Find the top salary of a department
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Q4. 4 pillars of oops
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Encapsulation, Inheritance, Polymorphism, Abstraction are the 4 pillars of OOPs
• Encapsulation: Bundling data and methods that operate on the data into a single unit. Example: Class in Java

• Inheritance: Ability of a class to inherit properties and behavior from another class. Example: Parent and Child classes

• Polymorphism: Ability to present the same interface for different data types. Example: Method overloading and overr...read more
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Code review to find bugs

Q1. State the features of interface Spring boot annotations Microservice communication table index
Ans. 
Interface features include abstraction, multiple inheritance, and contract enforcement.
• Abstraction: Interfaces allow for the definition of methods without implementation, providing a blueprint for classes to follow.

• Multiple Inheritance: Java interfaces support multiple inheritance, allowing a class to implement multiple interfaces.

• Contract Enforcement: Interfaces define a contract that implementing classes must adhere
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Q1. Basic Java, Oops concept, Spring boot, DSA
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Q2. Mostly common question. Based on java.
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Q1. SAP related questions
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Q1. High level Managerial round
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Java basic problems , Array , Collections, String , Java 8 , Spring Boot,String MVC

Q1. Tell me about your Project ?
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Q2. Write a code which count the number of String (words) occurrence in sentence ?
Ans. 
Count the occurrence of each word in a sentence using Java code.
• Split the sentence into an array of words using split() method.

• Create a HashMap to store each word and its count.

• Iterate through the array and update the count in the HashMap.

• Print the word and its count at the end.
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