Rocket Software Java Developer 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. 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. Basic Java, Oops concept, Spring boot, DSA
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Q2. Mostly common question. Based on java.
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Q1. 1.access modifier 2.type casting 3.super and this keyword 4. Thread and process 5. Wrapper class 6.drop an delete 7.join 8. Trigger 9.project questions
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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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Q1. Core Java related Questions
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Q2. SQL Databases related Questions
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Q1. Client side interview core Java, SQL, Spring Boot, hibernate
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Q1. What is Spring beans
Ans. 
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
Ans. 
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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