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The Checker Framework enhances Java’s type system to make it more powerful and useful. This lets software developers detect and prevent errors in their Java programs. The Checker Framework includes compiler plug-ins ("checkers") that find bugs or verify their absence. It also permits you to write your own compiler plug-ins.

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package org.checkerframework.checker.units.qual;

/* From http://en.wikipedia.org/wiki/SI_prefix:

yotta   Y   1000^8     10^24    1000000000000000000000000   Septillion      Quadrillion     1991
zetta   Z   1000^7     10^21    1000000000000000000000      Sextillion      Trilliard       1991
exa     E   1000^6     10^18    1000000000000000000         Quintillion     Trillion        1975
peta    P   1000^5     10^15    1000000000000000            Quadrillion     Billiard        1975
tera    T   1000^4     10^12    1000000000000               Trillion        Billion         1960
giga    G   1000^3     10^9     1000000000                  Billion         Milliard        1960
mega    M   1000^2     10^6     1000000                     Million                         1960
kilo    k   1000^1     10^3     1000                        Thousand                        1795
hecto   h   1000^2/3   10^2     100                         Hundred                         1795
deca    da  1000^1/3   10^1     10                          Ten                             1795
            1000^0     10^0     1                           One
deci    d   1000^-1/3  10^-1    0.1                         Tenth                           1795
centi   c   1000^-2/3  10^-2    0.01                        Hundredth                       1795
milli   m   1000^-1    10^-3    0.001                       Thousandth                      1795
micro   my  1000^-2    10^-6    0.000001                    Millionth                       1960
nano    n   1000^-3    10^-9    0.000000001                 Billionth       Milliardth      1960
pico    p   1000^-4    10^-12   0.000000000001              Trillionth      Billionth       1960
femto   f   1000^-5    10^-15   0.000000000000001           Quadrillionth   Billiardth      1964
atto    a   1000^-6    10^-18   0.000000000000000001        Quintillionth   Trillionth      1964
zepto   z   1000^-7    10^-21   0.000000000000000000001     Sextillionth    Trilliardth     1991
yocto   y   1000^-8    10^-24   0.000000000000000000000001  Septillionth    Quadrillionth   1991
*/
public enum Prefix {
    /** 10^24 */
    yotta,
    /** 10^21 */
    zetta,
    /** 10^18 */
    exa,
    /** 10^15 */
    peta,
    /** 10^12 */
    tera,
    /** 10^9 */
    giga,
    /** 10^6 */
    mega,
    /** 10^3 */
    kilo,
    /** 10^2 */
    hecto,
    /** 10^1 */
    deca,
    /** 10^0, or 1 */
    one,
    /** 10^-1 */
    deci,
    /** 10^-2 */
    centi,
    /** 10^-3 */
    milli,
    /** 10^-6 */
    micro,
    /** 10^-9 */
    nano,
    /** 10^-12 */
    pico,
    /** 10^-15 */
    femto,
    /** 10^-18 */
    atto,
    /** 10^-21 */
    zepto,
    /** 10^-24 */
    yocto
}