10+ IBM QA Engineer Interview Questions and Answers

The code for swapping numbers or alphabets in Python involves using a temporary variable to store one of the values.

• Create two variables to store the values to be swapped.

• Use a temporary variable to store one of the values.

• Assign the first value to the second variable and the temporary variable to the first variable.

Discuss with dev, review requirements and test cases, provide evidence from testing

• Have a discussion with the developer to understand their perspective and reasoning behind considering it a bug

• Review the requirements and test cases to ensure that the behavior in question aligns with the expected functionality

• Provide evidence from testing, such as logs, screenshots, or test results, to support your stance

• Collaborate with the team to come to a consensus on whether it is a bug o...read more

Constructor overloading is having multiple constructors in a class with different parameters, while constructor overriding is redefining a superclass constructor in a subclass.

• Constructor overloading allows a class to have multiple constructors with different parameters.

• Constructor overriding involves redefining a superclass constructor in a subclass with the same name and parameters.

• In constructor overloading, the constructors must have different parameter lists, while in co...read more

Authentication verifies the identity of a user, while authorization determines what actions a user is allowed to perform.

• Authentication confirms the user's identity through credentials like username and password.

• Authorization controls access to resources based on the user's identity and permissions.

• Example: Logging into a website (authentication) and then accessing specific pages based on user roles (authorization).

Server side code runs on the server and client side code runs on the client's browser.

• Server side code is executed on the server before the data is sent to the client's browser.

• Client side code is executed on the client's browser after receiving the data from the server.

• Examples of server side code include PHP, Java, and Python.

• Examples of client side code include JavaScript, HTML, and CSS.

Program to reverse a string

• Use a loop to iterate through the characters of the string

• Swap the characters from start to end of the string

• Continue swapping until reaching the middle of the string

final is a keyword used in Java to declare constants, while finally is a block of code used in exception handling to ensure a piece of code is always executed.

• final is used to declare constants in Java, its value cannot be changed once assigned

• finally is a block of code used in exception handling to ensure a piece of code is always executed, regardless of whether an exception is thrown or not

• Example: final int MAX_VALUE = 100; try { // code that may throw an exception } final...read more

The 'this' keyword in Java refers to the current instance of the class.

• Used to refer to instance variables or methods of the current object

• Can be used to differentiate between instance variables and local variables with the same name

• Can be passed as an argument to other methods

Basic principles of OOP include encapsulation, inheritance, and polymorphism.

• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Example: A 'Car' class may have properties like 'color' and 'model', and methods like 'start' and 'stop'.