Iris Software Interview Questions and Answers for Freshers

Two ways to write a sentence in mirror image form in Java: reverse string function and array conversion.

• Use the reverse() method of the String class to reverse the sentence

• Convert the sentence to a character array, then swap the first and last characters, second and second-to-last characters, and so on until the middle is reached

• Example: 'Hello World' becomes 'dlroW olleH'

Abstract classes, interfaces, and enums provide abstraction and modularity in Java.

• Abstract classes provide a partial implementation of a class and cannot be instantiated.

• Interfaces define a set of methods that a class must implement and can be used for multiple inheritance.

• Enums provide a set of named constants.

• All three are used for abstraction and modularity in Java.

• Abstract classes and interfaces are used for polymorphism and code reuse.

• Enums are used for defining a fixed...read more

Object-oriented software engineering is a framework for designing and developing software using objects.

• Object-oriented software engineering is a methodology for designing and developing software using objects.

• It involves creating classes and objects that encapsulate data and behavior.

• Frameworks are pre-built structures that provide a foundation for building software applications.

• Frameworks can include libraries, APIs, and other tools that simplify the development process.

• Exa...read more

ADBMS stands for Advanced Database Management System which is an extension of DBMS with additional features.

• ADBMS has advanced features like data mining, data warehousing, and online analytical processing.

• ADBMS is used for handling large and complex data sets.

• DBMS is a basic system for managing data and is used for small and simple data sets.

• DBMS does not have advanced features like ADBMS.

• Examples of ADBMS are Oracle, IBM DB2, and Microsoft SQL Server.

• Examples of DBMS are MyS...read more

Static is used in public static void main to allow the method to be called without creating an instance of the class.

• Static methods belong to the class and not to any instance of the class.

• The main method is the entry point of a Java program and needs to be called without creating an object of the class.

• The static keyword allows the main method to be called directly from the class, without creating an instance of the class.

• The main method signature is public static void main(...read more

Normalization is a process of organizing data in a database to reduce redundancy and dependency.

• Normalization is used to eliminate data redundancy and improve data integrity.

• It involves dividing a database into two or more tables and defining relationships between them.

• There are different levels of normalization, such as first normal form (1NF), second normal form (2NF), and so on.

• Normalization helps in efficient data retrieval and reduces the chances of data inconsistencies....read more

Java is an object-oriented language with features like inheritance, encapsulation, and polymorphism.

• Inheritance allows classes to inherit properties and methods from other classes.

• Encapsulation hides the implementation details of a class from other classes.

• Polymorphism allows objects to take on multiple forms or behaviors.

• Java also supports abstraction, interfaces, and exception handling.

• Example: class Car extends Vehicle, interface Drawable, try-catch block for exception han...read more

Aggregation functions are used to perform calculations on groups of data in a database.

• Aggregation functions include COUNT, SUM, AVG, MAX, and MIN.

• They are used with the GROUP BY clause to group data based on a specific column.

• COUNT function returns the number of rows in a table or the number of non-null values in a column.

• SUM function returns the sum of values in a column.

• AVG function returns the average of values in a column.

• MAX function returns the maximum value in a colum...read more