Which concepts in Java are the most important to know while learning Selenium?

Question

I am planning to learn Java with Selenium, can you help me with which concepts in Java are the most important to know while learning Selenium?

Answer 1

Basic concept - OOPs

How to create - Class & Object

Constructor - Important

Conditional & Looping statements

Exception Handling

Java File operations - File input/output-read/write [File I/O]

Assertions

Inheritance

Up-casting & Down-casting

Access Modifier

How to call methods (Static & non-Static)

String Handling

Above mentioned topics are most important to kick start with Java+Selenium.