Wavelength 1.1 creates Color objects given the wavelength or
the frequency of the light rather than the usual RGB or HSB.

instead of:
Color c = new Color(255, 0, 0);
use the freqency in nanometers, and gamma 0.0. .. 1.0.
Color c = Wavelength.wlColor( 400.0f, 0.80f );

or using frequency in Terahertz and gamma 0.0. .. 1.0.
Color c = Wavelength.fColor( 500.0f, 1.0f );

You might use it to draw a realistic rainbow, or to write
educational Applets about the light spectrum.

Version 1.1 just tidies the code a bit.