DJUNITS - Delft Java UNIT System

DJUNITS is a set of Java classes that make life easy for scientific software writers by catching many common errors at compile time.

  • DJUNITS performs automatic conversions between most commonly used units of the same type. E.g. conversion of distances from Miles to kilometers.
  • DJUNITS stores all values internally in the basic SI unit for that value. The value can be converted to any (user-selectable) suitable unit for display.
  • DJUNITS distinguishes Absolute and Relative values to catch common errors at compile time,
  • DJUNITS ensures that a quantities expressed in different (but compatible) units are correctly added together. E.g. a distance in Miles is correctly added to a distance in kilometers.
  • DJUNITS knows or computes the SI type of the result when a value in one unit is multiplied, or divided by another value (that may have another unit).
  • DJUNITS can create and carry out operations with new SI types such as s2/m2 using SIDimensions.
  • DJUNITS handles Scalars, Vectors and Matrices.
  • DJUNITS stores almost everything in immutable objects. Vectors and Matrices also come in a Mutable variant where the stored values can be modified one by one or all at once.
  • DJUNITS stores values as Float or Double values.

The demo project has a number of examples using DJUNITS.

DJUNITS has an open source BSD 3-clause license.

  • Third party components used in DJUNITS can not have a license that is more restrictive than BSD, Apache, MIT, LGPL, or Eclipse.
  • DJUNITS can be incorporated in part or in full in other products for any use (educational, commercial, whatever).
  • DJUNITS may be extended, evolved by anyone into anything else for any purpose.