10+ Coupa Software Inc Interview Questions and Answers

The object must implement the hashCode() and equals() methods to be used as a key in a hashmap.

• hashCode() method is used to generate a unique hash code for the object.

• equals() method is used to compare two objects for equality.

• Both methods are necessary for proper functioning of hashmap operations like put() and get().

Automating dynamic pages and finding XPaths involves using tools like Selenium and identifying unique attributes.

• Use Selenium WebDriver to interact with dynamic elements on the page.

• Identify unique attributes like IDs, classes, or other attributes to create stable XPaths.

• Use relative XPaths to locate elements based on their relationship to other elements.

• Regularly update and maintain XPaths to ensure they remain accurate as the page changes.

Use stringBuilder for toString() method as it is faster and not thread-safe.

• stringBuilder is faster than stringBuffer as it is not thread-safe

• toString() method is used for converting an object to a string

• If thread-safety is required, use stringBuffer instead

• Example: StringBuilder sb = new StringBuilder(); sb.append("Hello"); sb.append("World"); return sb.toString();

Yes, it is a good idea to wrap FileInputStream and FileOutputStream in buffered writers and readers.

• Buffered streams improve performance by reducing the number of I/O operations

• Buffered streams also provide additional functionality like readLine() and newLine()

• Buffered streams can be chained together for even better performance

• Example: BufferedReader br = new BufferedReader(new FileReader(file));

Test case for a microservice scheduling messages

• Verify that messages are scheduled correctly based on specified time

• Check if messages are sent to the correct recipients

• Ensure that messages are not duplicated or lost during scheduling

Our product follows a microservices architecture with a combination of front-end, back-end, and database layers.

• Utilizes microservices architecture for scalability and flexibility

• Front-end layer handles user interface and interactions

• Back-end layer manages business logic and data processing

• Database layer stores and retrieves data efficiently

• Communication between layers is done through APIs

Overloading is having multiple methods in the same class with the same name but different parameters. Overriding is implementing a method in a subclass that is already defined in the parent class.

• Overloading allows a class to have multiple methods with the same name but different parameters.

• Overriding involves implementing a method in a subclass that is already defined in the parent class.

• Overloading is resolved at compile time while overriding is resolved at runtime.

Different types of testing include unit testing, integration testing, system testing, and acceptance testing.

• Unit testing focuses on testing individual components or modules of the software.

• Integration testing involves testing how different modules work together.

• System testing tests the entire system as a whole.

• Acceptance testing is done to ensure the software meets the requirements of the end users.

A product is a tangible or intangible item that is created and offered for sale.

• Products can be physical goods, such as electronics or clothing.

• Products can also be services, such as software or consulting.

• Products are designed to meet a specific need or want of a customer.

• Products go through a lifecycle of development, launch, growth, maturity, and decline.

Object-oriented programming concepts in Java

• OOPs stands for Object-Oriented Programming

• It is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures

• Encapsulation, Inheritance, Polymorphism, and Abstraction are the four main principles of OOPs in Java

• Example: Class, Object, Inheritance, Polymorphism, Encapsulation

JVM stands for Java Virtual Machine, which is an abstract computing machine that enables a computer to run Java programs.

• JVM is responsible for converting Java bytecode into machine code that can be executed by the computer's processor.

• It provides a platform-independent execution environment for Java programs.

• JVM manages memory, handles garbage collection, and provides security features for Java applications.

• Examples of JVM implementations include Oracle HotSpot, OpenJ9, and ...read more