10+ Interview Questions and Answers

OOPS concepts are fundamental to object-oriented programming. It includes inheritance, polymorphism, encapsulation, and abstraction.

• Inheritance allows a class to inherit properties and methods from another class.

• Polymorphism allows objects to take on multiple forms and behave differently based on the context.

• Encapsulation is the practice of hiding data and methods within a class, making them inaccessible to outside code.

• Abstraction is the process of simplifying complex system...read more

Java program to reverse a string

• Create a character array of the given string

• Iterate through the array from both ends and swap the characters

• Convert the array back to string

Abstraction is a concept of hiding implementation details while Interface is a blueprint of a class.

• Abstraction is achieved through abstract classes and methods

• Interface is a contract that defines the methods that a class must implement

• Abstraction focuses on what an object does while Interface focuses on how it does it

• Abstraction is used for code reusability and maintainability while Interface is used for achieving multiple inheritances

• Abstraction is a way to achieve encapsul...read more

TestNG annotations are used to define the sequence of test methods execution.

• The @BeforeSuite annotation is executed before all tests in a suite.

• The @BeforeTest annotation is executed before all tests in a tag in the XML file.

• The @BeforeClass annotation is executed before the first test method in a class.

• The @BeforeMethod annotation is executed before each test method.

• The @Test annotation is used to mark a method as a test method.

• The @AfterMethod annotation is executed after...read more

Java has different data types such as int, double, char, boolean, etc.

• Primitive data types: int, double, char, boolean, byte, short, long, float

• Non-primitive data types: String, Array, Interface, Class

• Examples: int num = 10; double price = 19.99; char letter = 'A'; boolean flag = true;

Key features of Java include platform independence, object-oriented programming, robustness, and security.

• Platform independence: Java programs can run on any platform that has a Java Virtual Machine (JVM) installed.

• Object-oriented programming: Java supports the principles of OOP such as inheritance, encapsulation, and polymorphism.

• Robustness: Java has strong memory management, exception handling, and type checking mechanisms.

• Security: Java has built-in security features such ...read more

Regression testing is retesting of software to ensure that new code changes have not adversely affected existing functionality.

• Regression testing involves running previously executed test cases to verify that new code changes have not introduced any new bugs or issues.

• Retesting is the process of running failed test cases again after the bugs have been fixed to ensure they have been resolved.

• Regression testing is typically automated to save time and effort in retesting.

• It is i...read more

Cloud computing is the delivery of computing services over the internet, offering resources like storage, databases, networking, software, and more on a pay-as-you-go basis.

• Scalability: Cloud allows businesses to easily scale up or down based on their needs without investing in physical infrastructure.

• Cost-effective: Pay only for the resources you use, reducing upfront costs and maintenance expenses.

• Flexibility: Access your data and applications from anywhere with an internet...read more

JavaScript code to print 'Hello world'

• Use the console.log() function to print the message

• Enclose the message in quotes

• End the statement with a semicolon