What's wrong with using == to compare floats in Java?

Question

According to this java.sun page == is the equality comparison operator for floating point numbers in Java.

However, when I type this code:

Answer 1

Foating point values are not reliable, due to roundoff error.

As such they should probably not be used for as key values, such as sectionID. Use integers instead, or long if int doesn't contain enough possible values.