No, you don’t need to know math to be a Java developer. Java happens to be a programming language and doesn’t rely on math skills to code. However, having a basic understanding of math would be beneficial for certain applications and programming tasks.
For example, a good grasp of Linear Algebra, Calculus and Algorithms can help you to become better at solving certain problems that could be encountered when writing code. It can also come in handy when dealing with databases or analytics projects and understanding how certain functions work.
But it’s not a must. Java is largely a procedural language and many developers write code without having any knowledge of math. As long as you have the right logic, experience and understanding of the language, you can be successful in understanding the fundamentals of the language.
If you’re interested in learning more about math and how it relates to coding, there are lots of online resources which can help. One great example is Stanford's online course on ‘Programming with Numbers and Reasoning’ [https://online.stanford.edu/courses/cs103-intro-programming-reasoning-monday]. It covers everything from basic programming principles to taking complex data sets and using linear algebra to draw meaningful conclusions.
In short, you don’t need to be a math whiz to become a Java developer, but a basic understanding of the language’s math-related concepts can be beneficial when writing code.