Softenger Java Developer Interview Questions and Answers

Q1. How hashmap works internally
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Q1. Based on the resume
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Q1. Scenario based questions
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Q1. Package discussion
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Q1. Explain OOPs concepts.
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OOPs concepts are fundamental principles of object-oriented programming that help in designing and implementing software solutions.
• Encapsulation: Bundling data and methods together in a class.

• Inheritance: Creating new classes by inheriting properties and behaviors from existing classes.

• Polymorphism: Ability of an object to take on many forms.

• Abstraction: Hiding complex implementation details and providing a simplified ...read more
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Q2. Write a program to count occurance the letter in a string.
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This program counts the occurrence of each letter in a given string.
• Use a HashMap to store the count of each letter.

• Iterate through the characters of the string and update the count in the HashMap.

• Finally, print the count of each letter.
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Q3. Write a SQL query to find third highest salary from employee table.
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SQL query to find third highest salary from employee table.
• Use the ORDER BY clause to sort the salaries in descending order

• Use the LIMIT clause to limit the result to the third row

• Use a subquery to exclude the highest and second highest salaries
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Q4. Difference between Array and arraylist.
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Array is a fixed-size data structure while ArrayList is a dynamic-size data structure in Java.
• Array has a fixed length, while ArrayList can grow dynamically.

• Array can store both primitive types and objects, while ArrayList can only store objects.

• Array uses square brackets [] for declaration, while ArrayList uses angle brackets <>.

• Array provides direct access to elements using index, while ArrayList provides methods for...read more
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Q5. Explain working of Arraylist.
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ArrayList is a dynamic array that can grow or shrink in size. It stores objects and provides methods for adding, removing, and accessing elements.
• ArrayList is part of the Java Collections Framework.

• It is implemented as a resizable array.

• Elements can be added using the add() method.

• Elements can be accessed using the get() method.

• Elements can be removed using the remove() method.

• The size() method returns the number of el...read more
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Q6. What is the default size of an arraylist.
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The default size of an ArrayList is 10.
• The default initial capacity of an ArrayList is 10.

• If the number of elements exceeds the initial capacity, the ArrayList automatically increases its size.

• The capacity of an ArrayList can be increased manually using the ensureCapacity() method.
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Q7. Some questions from my resume about my previous experience.
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Q8. The interviewer was stupid and in my opinion they are just wasting your precious time. After the interview they don't provide any updates about the interview.
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Q1. Inheritance,polymorphism,local storage,abstraction, features of java,Jit,wrapper class
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Q2. Object oriented programming system
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Q3. Structured query language
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Q4. Database in sql
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A database in SQL is a structured collection of data that is stored and accessed using SQL queries.
• SQL stands for Structured Query Language, used to interact with databases.

• Tables are used to store data in a database, with rows representing individual records and columns representing attributes.

• Queries can be used to retrieve, insert, update, and delete data from a database.

• Primary keys uniquely identify each record in...read more
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Q5. Awt,jre,json,storage
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Q1. About Java, J2ee, Mysql, Spring-core, Spring-mvc, Spring-boot
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Q2. About java, j2EE, My-sql, Spring-core, Spring-mvc, Spring-boot
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Basic core Java mcqs and aptitude questions

Q1. Questions on core Java,spring MVC,spring boot , hibernate and msql
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