1)Compare two string using Java 8 features without comparator and comparable 2) Given an array to print non duplicate in the array 3) Solid principles 4) Stereo type annotations 5) how to make list immutable 6) junit questions 7 ) custom annotations 8 ) Java 8 features 9) Trigger in database 10) jboss memory 11) try with resource 12) Hashmap working 13) synchronised vs concurrent hashmap diff

Question

Accepted Answer

The interview questions cover a range of topics related to Java development, including Java 8 features, data structures, annotations, and database triggers.

Use Java 8 features like streams and lambda expressions to compare two strings without using comparator or comparable.
To print non-duplicate elements in an array, use a HashSet to store unique elements and then iterate through the array to check for duplicates.
Solid principles refer to a set of design principles for object-oriented programming, including Single Responsibility Principle, Open/Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, and Dependency Inversion Principle.
Stereo type annotations in Java are used to provide metadata about the class or method, such as @Component, @Service, @Repository, etc.
To make a list immutable in Java, use Collections.unmodifiableList() method to create an immutable view of the list.
JUnit is a popular testing framework for Java applications, used for writing and running unit tests.
Custom annotations in Java allow developers to define their own annotations for use in their code.
Java 8 features include lambda expressions, streams, functional interfaces, default methods in interfaces, etc.
Triggers in a database are special stored procedures that are automatically executed in response to certain events on a particular table or view.
JBoss memory management involves monitoring and optimizing memory usage in JBoss application server.
Try-with-resources is a Java feature introduced in Java 7 that automatically closes resources like streams, files, etc. after they are no longer needed.
HashMap in Java is a data structure that stores key-value pairs and uses hashing to efficiently retrieve values based on keys.
Synchronized HashMap is a thread-safe version of HashMap where all operations are synchronized, while ConcurrentHashMap is a thread-safe implementation of a hash table that allows concurrent access without blocking.

Top HCLTech Java Developer interview questions & answers

Popular interview questions of Java Developer

Top HR questions asked in HCLTech Java Developer