UST Java Software Engineer Interview Questions and Answers for Experienced

Q1. What is Dependency Injection?
Ans. 
Dependency Injection is a design pattern in which components are given their dependencies rather than creating them internally.
• Allows for easier testing by providing mock dependencies

• Promotes loose coupling between components

• Improves code reusability and maintainability

• Examples: Constructor injection, Setter injection, Interface injection
Answered by AI
Add your answer
Q2. How to handle exception in java
Ans. 
In Java, exceptions can be handled using try-catch blocks to catch and handle specific exceptions.
• Use try-catch blocks to catch exceptions and handle them gracefully

• Use multiple catch blocks to handle different types of exceptions

• Use finally block to execute code regardless of whether an exception is thrown or not

• Throw custom exceptions using throw keyword
Answered by AI
Add your answer

Q1. In Java8, different between flatmap and map
Ans. 
map transforms each element in a stream, while flatMap transforms each element into multiple elements
• map applies a function to each element in a stream and returns a new stream of the results

• flatMap applies a function that returns a stream for each element in the original stream, then flattens the streams into a single stream

• Example: map - stream.map(x -> x * x), flatMap - stream.flatMap(str -> Arrays.stream(str.split(
Answered by AI
Add your answer
Q2. How to handle the ConcureentModificationException
Ans. 
ConcurrentModificationException occurs when a collection is modified while iterating over it.
• Use Iterator to iterate over the collection instead of foreach loop.

• If modification is necessary, use Iterator's remove() method instead of collection's remove() method.

• Consider using synchronized collections or ConcurrentHashMap to avoid ConcurrentModificationException.
Answered by AI
Add your answer

Q1. React questions
Add your answer
Q2. JavaScript questions
Add your answer

Q1. React questions
Add your answer
Q2. JavaScript questions
Add your answer

Q1. Company related questions
Add your answer
Q2. Questions based on previous experience
Add your answer

It was good it was good

Q1. What is oop concept in java
Ans. 
OOP (Object-Oriented Programming) is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP in Java involves creating classes and objects, encapsulation, inheritance, and polymorphism.

• Classes are blueprints for objects, defining their properties and behaviors.

• Encapsulation involves bundling data (attributes) and methods (functions) that operate on the data within a single unit.

• Inher...read more
Answered by AI
Add your answer
Q2. What is exception handling in java
Ans. 
Exception handling in Java is a mechanism to handle runtime errors and prevent program crashes.
• Exceptions are objects that are thrown at runtime when an error occurs.

• Try block is used to enclose the code that might throw an exception.

• Catch block is used to handle the exception and provide a specific response.

• Finally block is used to execute code regardless of whether an exception is thrown or not.

• Example: try { // code...read more
Answered by AI
Add your answer

All question related to core java

Q1. In how many ways can create an object
Ans. 
An object can be created in Java using new keyword, clone method, newInstance method, and deserialization.
• Using new keyword: ClassName obj = new ClassName();

• Using clone method: ClassName obj2 = (ClassName) obj1.clone();

• Using newInstance method: ClassName obj3 = (ClassName) Class.forName("ClassName").newInstance();

• Using deserialization: ObjectInputStream in = new ObjectInputStream(new FileInputStream("file.ser")); Class
Answered by AI
Add your answer

All the aptitude questions including verbal, non-verbal, technical and general aptitude.

Q1. DBMS, OOPS, Java
Add your answer

Q1. What is OOps concept
Ans. 
Object-oriented programming paradigm focusing on objects and classes for code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (object)

• Inheritance: Ability for a class to inherit properties and behavior from another class

• Polymorphism: Ability for objects to be treated as instances of their parent class or their own class

• Abstraction: Hiding complex impleme...read more
Answered by AI
Add your answer
Q2. What is java 8
Ans. 
Java 8 is a major release of the Java programming language with new features like lambda expressions, streams, and functional interfaces.
• Introduced lambda expressions for functional programming

• Added streams API for processing collections

• Included default methods in interfaces for backward compatibility

• Introduced new Date and Time API (java.time package)
Answered by AI
Add your answer

Q1. Asked about general questions
Add your answer

Basic questions related to 2d array and string manipulation. 20 aptitude questions and 20+ topic related questions where there. Main focus should be on the coding questions.

Q1. Questions related to the resume and overall basic theoretical questions.
Add your answer

Q1. Version control
Add your answer