Yardi Systems Software QA Engineer Interview Questions and Answers

I am a software developer with experience in Java and Python.

• Proficient in Java and Python programming languages

• Experience in developing web applications using Spring framework

• Familiarity with database management systems such as MySQL and MongoDB

I have achieved success in developing and implementing various software solutions.

• Developed a web application that increased user engagement by 30%

• Implemented a new feature that reduced system downtime by 50%

• Created a mobile app that received 4.5-star rating on app stores

• Led a team of developers to successfully complete a project within a tight deadline

I work on a variety of projects ranging from web development to mobile app development.

• Web development using HTML, CSS, JavaScript, and various frameworks such as React and Angular

• Mobile app development for iOS and Android using Swift, Kotlin, and React Native

• Database design and management using SQL and NoSQL databases such as MySQL and MongoDB

• API development and integration using REST and GraphQL

• Machine learning proje...read more

A hardworker puts in more effort, while a smartworker works efficiently and effectively.

• A hardworker may spend more time on a task, while a smartworker finds ways to complete it faster.

• A hardworker may rely on brute force, while a smartworker uses their skills and knowledge to solve problems.

• A hardworker may struggle with prioritization, while a smartworker knows how to focus on the most important tasks.

• A hardworker ma...read more

Zuckerberg is in news due to Facebook's handling of user data and misinformation.

• Facebook's role in the 2016 US Presidential election

• Cambridge Analytica scandal

• Testimony before US Congress

• Ongoing debate on social media regulation

I am a software developer with experience in Java and Python.

• I have a Bachelor's degree in Computer Science.

• I have worked on various projects involving web development and data analysis.

• I am proficient in Java and Python programming languages.

• I am a quick learner and enjoy working in a team environment.

My favorite project is the e-commerce website I developed for a local business.

• I enjoyed working on the front-end design and user experience.

• I implemented a secure payment gateway and order tracking system.

• The website increased the business's online sales by 50%.

• I received positive feedback from the client and their customers.

Inheritance is a mechanism in object-oriented programming where a new class is created by inheriting properties of an existing class.

• Inheritance allows code reuse and promotes code organization.

• The existing class is called the parent or superclass, and the new class is called the child or subclass.

• The child class inherits all the properties and methods of the parent class and can also add its own unique properties and ...read more

finally is a keyword used in try-catch block, finalize is a method in Object class, and final is a keyword used for declaring constants.

• finally is used to execute a block of code after try-catch block

• finalize is called by garbage collector before destroying an object

• final is used to declare a constant variable or to make a class uninheritable

Private keyword restricts access to member functions within the class while final keyword prevents overriding of functions.

• Private keyword is used to hide the implementation details of a class from the user.

• Final keyword is used to prevent the user from overriding a function in a subclass.

• Using private and final keywords together can ensure that the implementation details of a class are not modified by the user.

An interface defines a set of methods that a class must implement.

• An interface is declared using the 'interface' keyword.

• All methods in an interface are public and abstract by default.

• A class can implement multiple interfaces.

• Interfaces can also extend other interfaces.

• Example: public interface MyInterface { void myMethod(); }

Abstract class is a class with some implementation while Interface is a contract with no implementation.

• Abstract class can have constructors while Interface cannot

• Abstract class can have non-abstract methods while Interface cannot

• A class can implement multiple interfaces but can only inherit from one abstract class

• Abstract class is used when there is a need for common functionality among related classes while Interface...read more

Inheritance types in Java

• Java supports single and multiple inheritance through classes and interfaces respectively

• Single inheritance is when a class extends only one parent class

• Multiple inheritance is when a class implements multiple interfaces

• Java also supports hierarchical inheritance where multiple classes extend a single parent class

• Java does not support multiple inheritance through classes to avoid the diamond pr

Order of catch blocks in a try block in Java

• Specific catch blocks should come before general catch blocks

• If general catch block comes before specific catch block, it will result in a compile-time error

• If multiple catch blocks are present, only the first matching catch block will be executed

Garbage collection is an automatic memory management process that frees up memory occupied by objects that are no longer in use.

• Garbage collection is used in programming languages like Java, C#, and Python.

• It helps prevent memory leaks and reduces the risk of crashes due to memory exhaustion.

• Garbage collection works by identifying objects that are no longer in use and freeing up the memory they occupy.

• There are differe...read more

Code for connecting a Java application to a database

• Import the JDBC driver for the specific database

• Create a connection object using the DriverManager class

• Create a statement object to execute SQL queries

• Execute the query and retrieve the results

• Close the connection and release resources

JSON stands for JavaScript Object Notation, a lightweight data interchange format.

• JSON is used to transmit data between a server and a web application, as an alternative to XML.

• It is easy to read and write for humans and easy to parse and generate for machines.

• JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C family of languages.

• Example: {"name"

Find the minimum and maximum values in an array in a single traversal.

• Initialize min and max variables with the first element of the array

• Iterate through the array and update min and max if a smaller or larger value is found

• Return the min and max values

The maximum number of squares on a chessboard is 64.

• The chessboard has 64 squares in total.

• The number of squares on a chessboard can be calculated using the formula n^2, where n is the number of rows or columns.

• In this case, n = 8 (8 rows and 8 columns), so the maximum number of squares is 8^2 = 64.

C++ is a programming language. Deep copy creates a new object and copies all values, while shallow copy creates a reference to the original object.

• C++ is a general-purpose programming language

• Deep copy creates a new object with its own copy of the data

• Shallow copy creates a reference to the original object

• Deep copy is safer but can be slower and consume more memory

• Shallow copy is faster but can lead to unexpected behav

Pre initialization refers to the process of initializing variables or objects before they are used in a program.

• Pre initialization helps avoid errors or unexpected behavior caused by using uninitialized variables.

• It is a good practice to pre initialize variables with default values.

• Pre initialization can be done using constructors, default values, or initialization blocks.

• Example: int count = 0; initializes the variabl

Reverse a linked list with and without using Recursion

• Iterative approach: Use three pointers to reverse the links between nodes

• Recursive approach: Recursively reverse the rest of the list and then fix the links

Polymorphism refers to the ability of an object to take on many forms. The diamond problem occurs in multiple inheritance.

• Polymorphism can be achieved through method overloading and method overriding.

• Method overloading allows multiple methods with the same name but different parameters.

• Method overriding occurs when a subclass provides a specific implementation of a method already defined in its superclass.

• The diamond p...read more

The program should differentiate between integers and characters when using the assignment operator (=).

• Check the data type of the variable before assigning a value.

• Use conditional statements to perform different actions based on the data type.

• For integers, assign the value directly. For characters, convert the character to its ASCII value and assign it.

Sort an array by moving all zeroes to the end.

• Iterate through the array and move all non-zero elements to the front.

• Count the number of zeroes encountered and append them at the end of the array.

• Use two pointers to swap elements and maintain the order.

The number of VTables created in a class hierarchy depends on the number of virtual functions and the number of derived classes.

• VTables are used in object-oriented programming languages to implement dynamic dispatch.

• Each class with at least one virtual function has its own VTable.

• Derived classes inherit the VTable of their base class and add their own entries for any additional virtual functions.

• The total number of VTa...read more

List is preferred when frequent insertion and deletion is required. Vector is preferred when random access is required.

• List is implemented as a doubly-linked list, allowing for efficient insertion and deletion at any position.

• Vector is implemented as a dynamic array, allowing for efficient random access.

• Use List when the number of elements is expected to change frequently and the order of elements matters less.

• Use Vect...read more

The given string needs to be reversed and the words need to be rearranged.

• Split the string into an array of words

• Reverse the array

• Join the array elements with a space in between

Design a parking lot with Logic Flow Diagram, E-R diagram, DB tables with relations, and commands for transactions.

• Identify the types of vehicles that will use the parking lot

• Determine the number of parking spaces needed for each vehicle type

• Create a flow diagram to show the process of entering and exiting the parking lot

• Design an E-R diagram to show the relationships between entities such as vehicles, parking spaces, ...read more

To find min and max of an array in one traversal, initialize min and max to first element and compare with rest.

• Initialize min and max to first element of array

• Traverse the array and compare each element with min and max

• Update min and max accordingly

• Return min and max

Given a chessboard, find the maximum number of squares present.

• Start with the smallest square and count all possible squares

• Use the formula n*(n+1)*(2n+1)/6 to find the total number of squares in an n x n chessboard

• Add up the squares of all sizes from 1 to n to get the maximum number of squares

• For example, an 8 x 8 chessboard has 204 squares

C++ is a high-level programming language used for developing system software, application software, device drivers, and video games.

• C++ was developed by Bjarne Stroustrup in 1983.

• It is an extension of the C programming language.

• C++ supports object-oriented programming, generic programming, and low-level memory manipulation.

• It is used in developing operating systems, browsers, databases, and more.

• Examples of popular sof...read more

Deep copy creates a new object with a new memory address, while shallow copy creates a new reference to the same memory address.

• Deep copy duplicates the object and all its nested objects, while shallow copy only duplicates the top-level object.

• Deep copy is slower and more memory-intensive than shallow copy.

• Shallow copy can lead to unexpected behavior if the original object is modified.

• In Python, deep copy can be achiev...read more

Preinitialization is the process of initializing data or objects before they are actually needed.

• Preinitialization can improve performance by reducing the time needed to initialize data or objects when they are actually needed.

• It can also help to avoid delays or interruptions during runtime.

• Examples of preinitialization include preloading data into memory, initializing objects in advance, and caching frequently used da

Polymorphism can be achieved through method overloading, method overriding, and interfaces. Multiple inheritance can be solved using interfaces.

• Method overloading allows multiple methods with the same name but different parameters

• Method overriding allows a subclass to provide its own implementation of a method already defined in its superclass

• Interfaces provide a way to achieve multiple inheritance by allowing a class ...read more

WAP to generate a matrix from a given tree.

• Create a 2D array to store the matrix

• Traverse the tree and fill the matrix accordingly

• Use BFS or DFS to traverse the tree

• The matrix will be symmetric along the diagonal

Primary key is a column or set of columns that uniquely identifies each row in a table. Unique key is a constraint that ensures uniqueness of values in a column or set of columns.

• Primary key is used to enforce data integrity and ensure that each row in a table can be uniquely identified.

• Unique key is used to ensure that no two rows in a table have the same values in a column or set of columns.

• Primary key can be a singl...read more

Yes, a unique key can be a primary key.

• A primary key is a unique identifier for a record in a table.

• A unique key is a constraint that ensures the values in a column are unique.

• A unique key can be used as a primary key if it meets the requirements.

• A primary key cannot have NULL values, while a unique key can have one NULL value.

Foreign key is a column in a table that refers to the primary key of another table.

• It establishes a relationship between two tables.

• It ensures referential integrity.

• It can be null, but only if it is defined as nullable.

• It helps in joining tables.

• Example: Customer table has a foreign key to the Order table's primary key.

• Example: Order table's foreign key can be null if the order has not been placed by any customer yet.

Normalization is the process of organizing data in a database to reduce redundancy and improve data integrity.

• Normalization involves breaking down a database into smaller, more manageable tables.

• It helps to eliminate data redundancy and inconsistencies.

• Normalization ensures that each table has a primary key and that data is stored in a logical and consistent manner.

• It improves data integrity and reduces the likelihood ...read more

Normalized form is better for data consistency and scalability.

• Normalized form reduces data redundancy and ensures data consistency.

• Normalized form allows for easier scalability and maintenance.

• Single table/2 tables may be appropriate for small, simple datasets.

• Normalized form may require more complex queries to retrieve data.

• Normalized form may require more storage space due to additional tables.

• Example: Normalized fo...read more

Create a database for Indian Premier League (IPL)

• Identify entities like teams, players, matches, venues, etc.

• Create tables for each entity with relevant attributes

• Establish relationships between tables using foreign keys

• Add constraints like unique, not null, default values, etc.

• Populate tables with data from reliable sources

Query to find player with maximum runs in a match on given date and venue

• Use MAX() function to find maximum runs

• Join tables for player name, match details and runs scored

• Filter by given date and venue

• Order by runs scored and limit to 1 result