Infosys Technology Analyst Interview Questions, Process, and Tips

DBMS stands for Database Management System. It is a software that manages databases, allowing users to store, retrieve, and manipulate data efficiently.

• DBMS helps in creating, updating, and managing databases.

• It provides a structured way to store and organize data.

• DBMS ensures data integrity and security.

• Examples of DBMS include MySQL, Oracle, and Microsoft SQL Server.

A mutating error occurs when a program attempts to modify a data structure while iterating over it.

• Occurs when a program tries to modify a collection (e.g. array, list) while iterating through it

• Can lead to unexpected behavior or errors in the program

• Common in languages like Python, where modifying a list while iterating over it can cause a mutating error

HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

• HashMap is part of the Java Collections framework.

• It uses hashing to store and retrieve elements efficiently.

• Each key in a HashMap must be unique.

• Example: HashMap map = new HashMap<>();

Data structures are different in terms of their implementation, efficiency, and usage in solving specific problems.

• Different data structures have different ways of organizing and storing data, such as arrays, linked lists, trees, and graphs.

• Each data structure has its own set of operations that can be performed efficiently, such as searching, inserting, deleting, and sorting.

• Choosing the right data structure is crucial...read more

Filter employee objects from a list using Java streams.

• Use stream() method to convert the list to a stream.

• Use filter() method to specify the condition for filtering employee objects.

• Use collect() method to collect the filtered employee objects into a new list.

Java program to sort a list of strings

• Use Collections.sort() method to sort the list of strings

• Create a list of strings and add elements to it

• Call Collections.sort() method on the list to sort it