java - Why doesn't Number use Comparable/Comparator -

Brief questions;

I have read Jawadox for comparative and comparative and I do not understand the difference Comparative throws a NullPointerException and has been implemented by comparative multiple classes, so its methods are more readily available, are they the only difference?

Why does the second part of my question implement a consistent number, but something like BigDecimal does? It appears that only nuclear integers and nuclear line numbers do not implement comparisons with the class. Why is this so? Why not 'nuclear' classes are compatible?

Long questions;

I ask because of this because I am trying to convert a life-force to an object (likely to be a boolean, string or number) for easy performance and a switch on the return To do this, it compares the number one person to each operator to determine how I want to use relational operators.

My test has shown that non-preferences can not be compared, unless you're using comparative comparison ().

I have to try to change the number to less generic, which requires me, but I was thinking of going overflow and memory usage to go wild but I know that the floating point is the exact problems stack overflow How can more experienced members handle this problem?