Silver Touch Technologies Java Developer Interview Questions and Answers

Q1. Explain OOPs concepts.
Ans. 
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
Answered by AI
Add your answer
Q2. Write a program to count occurance the letter in a string.
Ans. 
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.
Answered by AI
Add your answer
Q3. Write a SQL query to find third highest salary from employee table.
Ans. 
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
Answered by AI
Add your answer
Q4. Difference between Array and arraylist.
Ans. 
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
Answered by AI
Add your answer
Q5. Explain working of Arraylist.
Ans. 
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
Answered by AI
Add your answer
Q6. What is the default size of an arraylist.
Ans. 
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.
Answered by AI
Add your answer
Q7. Some questions from my resume about my previous experience.
Add your answer
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.
Add your answer

1 hr withs ome basic english grammer

Q1. What is servlet life cycle
Ans. 
Servlet life cycle refers to the sequence of events that occur during the lifespan of a servlet.
• Servlet is loaded into memory when the server starts

• init() method is called to initialize the servlet

• service() method is called to handle client requests

• destroy() method is called when the servlet is removed from memory

• Servlet can be reloaded if the server is restarted
Answered by AI
Add your answer
Q2. What is try with resources
Ans. 
Try with resources is a feature introduced in Java 7 to automatically close resources after use.
• It simplifies the code by eliminating the need for a finally block to close the resource

• The resource must implement the AutoCloseable interface

• Multiple resources can be declared in a single try-with-resources statement

• Example: try(FileInputStream fis = new FileInputStream("file.txt")) { //code }
Answered by AI
Add your answer

Q1. They asked some core Java Concepts,String,Java 8,SpringBoot Architecture,Stream API code
Add your answer

Collection , logical

Q1. Opps ,spring boot
Add your answer
Q2. Explain opps concept, what is spring boot
Ans. 
OOPs concept is a programming paradigm based on the concept of objects, Spring Boot is a framework for building Java applications.
• OOPs concept stands for Object-Oriented Programming, which focuses on creating objects that interact with each other to solve problems.

• It involves concepts like inheritance, encapsulation, polymorphism, and abstraction.

• Spring Boot is a framework that simplifies the development of Java applic...read more
Answered by AI
Add your answer
Q3. What is controller and rest controller
Ans. 
Controller is a class that handles user requests and returns appropriate response. Rest controller is a specialized controller for RESTful web services.
• Controller is a class in MVC architecture that handles user requests and interacts with the model and view.

• Rest controller is a specialized controller in Spring framework for building RESTful web services.

• Rest controller uses annotations like @RestController and @Reques...read more
Answered by AI
Add your answer
Q4. Internal working of hashmap
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to find the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• HashMap allows null keys and values, but only one null ...read more
Answered by AI
Add your answer
Q5. Who is best jdbc or hibernate
Add your answer