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10+ Iris Software Senior Engineer Interview Questions and Answers

Updated 17 Jun 2024

Q1. Java 8 vs 7 case studies. Stream vs collections case studies.

Ans.

Java 8 introduced streams which are more efficient than collections in certain cases.

  • Streams are useful for processing large amounts of data in parallel

  • Collections are better for small amounts of data or when modifying data

  • Java 8's stream API provides a functional programming approach to data processing

  • Java 7's collections API is more traditional and imperative

  • Example: Using streams to filter and map data from a database query

  • Example: Using collections to manipulate a small l...read more

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Q2. Add one to a given String of number

Ans.

Add one to a given String of number

  • Convert the string to integer, add one, and convert back to string

  • Handle edge cases like leading zeros

  • Consider using built-in functions like parseInt() and toString()

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Q3. How to add dynamic component in view

Ans.

To add a dynamic component in a view, use a framework or library that supports dynamic rendering and component creation.

  • Use a framework like React or Angular that allows for dynamic component creation

  • Create a component factory or use a component resolver to dynamically create and render components

  • Pass data or props to the dynamic component to customize its behavior

  • Update the view or component tree to include the dynamically created component

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Q4. All Concurrent Utility Classes and their uses.

Ans.

Concurrent Utility Classes provide support for concurrent programming in Java.

  • ConcurrentHashMap: Thread-safe implementation of Map interface.

  • CopyOnWriteArrayList: Thread-safe implementation of List interface.

  • CountDownLatch: Synchronization aid that allows one or more threads to wait until a set of operations being performed in other threads completes.

  • Semaphore: Controls the number of threads that can access a shared resource concurrently.

  • ExecutorService: Interface that provid...read more

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Q5. Core java using java 8 features

Ans.

Core Java features in Java 8 include lambda expressions, functional interfaces, streams, and default methods.

  • Lambda expressions allow you to pass functionality as an argument to a method.

  • Functional interfaces have a single abstract method and can be used with lambda expressions.

  • Streams provide a way to process collections of objects in a functional style.

  • Default methods allow interfaces to have methods with implementations.

  • Example: Using lambda expressions to iterate over a l...read more

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Q6. What are the feature of jdk 8

Ans.

JDK 8 features include lambda expressions, functional interfaces, streams, and default methods.

  • Lambda expressions allow you to write code in a more concise and readable way.

  • Functional interfaces enable the use of lambda expressions.

  • Streams provide a way to work with sequences of elements efficiently.

  • Default methods allow interfaces to have concrete methods.

  • Date and Time API improvements.

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Q7. Difference between deep and shallow copy

Ans.

Deep copy creates a new object and recursively copies all nested objects, while shallow copy creates a new object and copies the references to nested objects.

  • Deep copy duplicates all levels of the object hierarchy, ensuring that changes in the copied object do not affect the original object.

  • Shallow copy only duplicates the top-level object, so changes in the copied object may affect the original object.

  • Deep copy is more time and memory-consuming than shallow copy.

  • In Python, d...read more

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Q8. Ways to set values in form groups

Ans.

Ways to set values in form groups

  • Use setValue() method to set values in form groups

  • Use patchValue() method to set values in form groups

  • Use reset() method to set values in form groups

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Q9. Oops concepts in java

Ans.

Oops concepts in java refer to Object-Oriented Programming principles like Inheritance, Encapsulation, Polymorphism, and Abstraction.

  • Inheritance: Allows a class to inherit properties and behavior from another class.

  • Encapsulation: Bundling data and methods that operate on the data into a single unit.

  • Polymorphism: Ability of a method to do different things based on the object it is acting upon.

  • Abstraction: Hiding the implementation details and showing only the necessary feature...read more

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Q10. Internal working of hashmap

Ans.

HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.

  • HashMap internally uses an array of linked lists to store key-value pairs.

  • When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

  • If multiple keys hash to the same index, a linked list is used to handle collisions.

  • HashMap uses the hashCode() method of keys to calculate the hash value.

  • HashMap provides constant-t...read more

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