What is the preferred way to write boolean expressions in Java

Question

I have always written my boolean expressions like this:

if (!isValid) {
  // code
}

But my new employer insists on the following style:

Answer 1

It was discussed for C# several hours ago.

The false == isValid construct is a leftover from C-world, where compiler would allow you to do assignments in if statement. I believe Java compilers will warn you in such case.

Overall, second option is too verbose.