com.numericalmethod.suanshu.number

Interface NumberUtils.Comparable<T extends java.lang.Number>

Type Parameters:

T - a subclass of Number

All Known Implementing Classes:

Complex

Enclosing class:

NumberUtils

public static interface NumberUtils.Comparable<T extends java.lang.Number>

We need a precision parameter to determine whether two numbers are close enough to be treated as equal. All subclasses of Number must implement this interface to work with NumberUtils.compare(java.lang.Number, java.lang.Number, double).

Method Summary

Modifier and Type	Method and Description
int	compare(java.lang.Number that, double epsilon) Compare this and that numbers up to a precision.

Method Detail

compare

int compare(java.lang.Number that,
            double epsilon)

Compare this and that numbers up to a precision.

Parameters:

that - a Number. As a number can be represented in multiple ways, e.g., 0 = 0 + 0i, the implementation may need to check Object type.

epsilon - a precision parameter: when a number |x| ≤ ε, it is considered 0

Returns:

0 if both numbers are close enough; +1 if this is bigger; -1 if that is bigger