Changepond Technologies Java Developer Interview Questions and Answers

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. What is Spring beans
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Q2. What is Spring boot
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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?
Ans. 
Yes, you can create a Spring Boot application without Spring Initializr by setting up dependencies manually.
• Create a Maven or Gradle project structure manually.

• Add Spring Boot dependencies in the pom.xml (for Maven) or build.gradle (for Gradle).

• Create a main application class annotated with @SpringBootApplication.

• Configure application properties in application.properties or application.yml.

• Run the application using 'mv...read more
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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?
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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...read more
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Q1. What are steps of involved in jdbc?
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