How much Java knowledge is required to learn Selenium?

To effectively work with Selenium, you need to have a solid understanding of core Java concepts. While you don't need to be an expert in Java, a good grasp of the language is essential. Here are some core Java concepts that you should be familiar with:

1. Object-Oriented Programming (OOP): Selenium is built using object-oriented principles, so understanding the concepts of classes, objects, inheritance, encapsulation, and polymorphism is crucial.

2. Variables and Data Types: Familiarize yourself with different data types such as int, double, String, boolean, etc. Understand how to declare variables, assign values, and manipulate them.

3. Control Statements: Learn about conditional statements (if-else, switch-case) and looping constructs (for, while, do-while) to control the flow of your program.

4. Methods: Understand how to define and use methods, pass arguments, and return values. You'll be working with various Selenium methods, so it's essential to know how to call and define them correctly.

5. Exception Handling: Learn about handling exceptions and understanding the try-catch-finally blocks to handle errors effectively.

6. Collections Framework: Familiarize yourself with collections such as ArrayList, HashMap, and HashSet. You'll often use them to store and manipulate data in Selenium test scripts.

7. File Handling: Understand how to read from and write to files using Java's file handling capabilities. This knowledge can be helpful when dealing with data input/output in Selenium.

8. Basic understanding of HTML and CSS: Selenium is used to automate web applications, so having a basic understanding of HTML and CSS will help you locate elements on a web page using locators like IDs, classes, CSS selectors, etc.

By having a solid foundation in these core Java concepts, you'll be better equipped to write efficient and maintainable Selenium scripts. Additionally, as you delve deeper into Selenium, you'll also learn specific Selenium APIs and advanced Java concepts that are relevant to automation testing.