Solverminds Solutions and Technologies 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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Q1. Ask about project,springboot
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Q2. What is jira and uses
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Basically aptitude test is completely based on core java concepts

Q1. What is java What are the features of java What is try and catch block What is mean by static What is the difference between arraylist and hashet
Ans. 
Java is a high-level, object-oriented programming language used for developing applications.
• Java features include platform independence, automatic memory management, and exception handling.

• Try and catch blocks are used for handling exceptions in Java.

• Static is a keyword used to create class-level variables and methods.

• ArrayList is a dynamic array that can grow and shrink in size, while HashSet is a collection that does
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Q1. What are steps of involved in jdbc?
Ans. 
JDBC involves steps like loading driver, establishing connection, creating statement, executing query and handling results.
• Load the JDBC driver using Class.forName() method

• Establish a connection to the database using DriverManager.getConnection() method

• Create a statement object using the connection.createStatement() method

• Execute the query using statement.executeQuery() method

• Handle the results using ResultSet object
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Q1. Question related to multithreading, jsp ,servlet and jdbc
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Q2. Brush up basic java programming
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This is the second round and i was eliminated from this round

Q1. What is runtime polymorphism, and can you provide a code example to illustrate it?
Ans. 
Runtime polymorphism allows a subclass to provide a specific implementation of a method that is already provided by its parent class.
• Runtime polymorphism is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass.

• The method to be overridden must have the same name, return type, and parameters in both the superclass and subclass.

• When an o...read more
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Q2. Streams in java
Ans. 
Streams in Java provide a way to process collections of objects in a functional style.
• Streams are sequences of elements that support various operations like filter, map, reduce, etc.

• They can be created from collections, arrays, or generate elements dynamically.

• Streams can be sequential or parallel, allowing for efficient processing of large datasets.

• Example: List<String> names = Arrays.asList("Alice", "Bob", "Cha...read more
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Q3. How do we create threads in Java, and how do we invoke them?
Ans. 
Threads in Java are created by extending the Thread class or implementing the Runnable interface, and invoked using the start() method.
• Threads can be created by extending the Thread class and overriding the run() method.

• Threads can also be created by implementing the Runnable interface and passing an instance of the class to a Thread object.

• Threads are invoked by calling the start() method on the Thread object.
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Q4. What is a Rest Template and how is it used?
Ans. 
Rest Template is a class in Spring that simplifies making HTTP requests and handling responses.
• Rest Template is part of the Spring framework in Java.

• It can be used to make HTTP requests to RESTful web services.

• It simplifies the process of making HTTP calls and handling responses.

• Rest Template can handle GET, POST, PUT, DELETE, etc. requests.

• Example: RestTemplate restTemplate = new RestTemplate();
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