ivy Java Developer Interview Questions and Answers

Q1. Spring IOC containers explain
Ans. 
Spring IOC containers are responsible for managing the instantiation of objects and their dependencies in a Spring application.
• IOC stands for Inversion of Control, which means that the control of object creation is inverted from the application code to the Spring framework.

• There are two main types of Spring IOC containers: BeanFactory and ApplicationContext.

• BeanFactory is the simplest container, providing basic support...read more
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Q2. Metaspace in java
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Metaspace is a part of the Java HotSpot VM memory where class metadata is stored.
• Metaspace replaces the permanent generation (PermGen) in Java 8 and later versions.

• It is used to store class metadata such as class names, method names, field names, annotations, etc.

• Metaspace is dynamically resized by the JVM based on the application's demand.

• You can monitor Metaspace usage using tools like JConsole or VisualVM.
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Q3. Difference between prdicate & consumer?
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Predicate is a functional interface that represents a boolean-valued function, while Consumer is a functional interface that represents an operation that accepts a single input argument and returns no result.
• Predicate is used for filtering elements based on a condition, while Consumer is used for performing actions on elements.

• Predicate has a test() method to evaluate a condition, while Consumer has an accept() method ...read more
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Java 8 stream based question

Q1. About project of previous company
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Q2. Check palindrome and odd of given number
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Q1. Goals for the future
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To become a senior Java developer and contribute to innovative projects in a collaborative team environment.
• Continue learning new technologies and best practices in Java development

• Work on challenging projects to enhance problem-solving skills

• Collaborate with team members to share knowledge and improve code quality
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Q2. How do you think you can impact our company
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I believe my strong Java skills and problem-solving abilities can positively impact the company by improving efficiency and developing innovative solutions.
• I have experience in developing efficient and scalable Java applications, which can help streamline processes within the company.

• I am skilled in identifying and solving complex technical issues, which can contribute to the overall success of projects.

• I am proactive ...read more
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Q1. Try, catch, finally...
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Q2. HTTP families (400,200,500)
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Q1. Java, sql ,springboot
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JAVA , OOPS C++ ,C and other

Q1. C , c++ , oops , Java are questions for the interview in but I language for comfortable in hindi
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Reverse string code and reverse array code

Q1. Basic of java, pillar of oops, collection, exception handling etc.
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Q2. What isinheritance
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Inheritance is a mechanism in object-oriented programming where a class inherits properties and behaviors from another class.
• Allows a class to inherit attributes and methods from another class

• Promotes code reusability and reduces redundancy

• Creates a parent-child relationship between classes

• Example: Class 'Car' can inherit from class 'Vehicle' and inherit properties like 'speed' and methods like 'drive()'
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Q3. What is encapsulation
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Encapsulation is the concept of bundling data and methods that operate on the data into a single unit, known as a class.
• Encapsulation helps in hiding the internal state of an object and restricting access to it.

• It allows for better control over the data by preventing direct modification from outside the class.

• Access to the data is provided through methods, which can enforce validation rules and ensure data integrity.

• Ex...read more
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Q4. What is polymorphism
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Polymorphism is the ability of a single function or method to operate on different types of data.
• Polymorphism allows objects of different classes to be treated as objects of a common superclass.

• There are two types of polymorphism: compile-time (method overloading) and runtime (method overriding).

• Example: Animal superclass with Dog and Cat subclasses. Both Dog and Cat can be treated as Animals.
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Q5. What is abstraction
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Abstraction is the concept of hiding complex implementation details and showing only the necessary features to the user.
• Abstraction allows developers to focus on what an object does rather than how it does it

• It helps in reducing complexity and improving code readability

• Example: In Java, abstract classes and interfaces are used to achieve abstraction
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Polymorphism ,table print ,reverse

Reasoning, english synonyms,math, opposite words

Oops ,collection, thread, Servlet ,JSP, databases

Find min ,max and second largest (avoid duplicates)using streams

Q1. Multiple inheritance , encapsulation, Collections-Hashmap,Set,list etc with coding questions, substrings,
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Q2. Checked and unchecked expections with example
Ans. 
Checked exceptions are checked at compile time, while unchecked exceptions are not.
• Checked exceptions must be either caught or declared in the method signature using 'throws'

• Unchecked exceptions do not need to be caught or declared

• Example of checked exception: IOException

• Example of unchecked exception: NullPointerException
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Q3. Spring boot annotations
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Q4. Java 8 features,stream api,lambda with coding
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