Solverminds Solutions and Technologies Java Developer Intern Interview Questions and Answers

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
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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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Q1. What is Spring beans
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Spring beans are Java objects managed by the Spring IoC container.
• Spring beans are defined in the Spring configuration file using XML or annotations.

• They are instantiated, assembled, and managed by the Spring IoC container.

• Beans can be singleton, prototype, request, session, or custom scoped.

• Dependency injection is used to inject dependencies into Spring beans.
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Q2. What is Spring boot
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Spring Boot is a framework that simplifies the development of Java applications by providing pre-configured settings and tools.
• Spring Boot eliminates the need for manual configuration by providing defaults for most settings.

• It allows developers to quickly set up and run standalone Spring-based applications.

• Spring Boot includes embedded servers like Tomcat, Jetty, or Undertow for easy deployment.

• It promotes convention o...read more
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Q1. Spring Initializer
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Q2. I you do not use Spring Initializer is it possible to create a Spring boot application?
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Core java, multi-threading, Strings, Exception

Q1. Core java, jdbc, SQL, Collection
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Q1. Core Java, advance java, Multi threading, Exception, Collection, Sql
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Q1. Introduction, About Company, Previous Experience
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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?
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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