Juval Lowy
Juval Lowy是一名经验丰富的软件设计师,同时也是IDesign公司(一家咨询和培训公司,其业务集中在使用微软的COM+和.NET平台进行面向组件设计方面)的负责人。Juval非常热爱面向组件编程,作为早期采用者,Juval在COM和.NET方面拥有独到的经验。Juval是《Visual Studio》杂志(以前的VBPJ/VCDJ)和《.NET》杂志的特约撰稿人,还经常作为发言人出现在主要的软件开发会议上。他在UC Berkeley Extension讲授COM和.NET。Juval以前是KLATencor公司(《财富》评出的500强公司之一)的软件体系结构经理,他在那里设计和开发在公司之间使用的大型框架和组件。Juval住在加利福尼亚的San Jose。可以通过站点http://www.componentware.net与他联系。
The animal on the cover of Programming .NET Components, Second Edition, is a
land hermit crab (Coenobita clypeatus). Land hermit crabs are found in tropical areas
of the Indo-region, the western Atlantic, and the western Caribbean. They live close
to the shoreline and must have access to land and water.
The front half of a hermit crab is covered with a hard exoskeleton. The long
abdomen has a softer exoskeleton that can adjust to fit into a spiraled shell. The large
left claw is used for defense, for holding onto tree limbs, and for balance. The smaller
right claw and the next pair of appendages are used for collecting and passing food
and water to the mouth. Hermit crabs have stalked eyes with acute vision and two
pairs of antennae. The longer pair of antennae is used for feeling, the shorter for
smelling and tasting.
The land hermit crab doesn’t have a hard shell of its own; it uses old empty shells to
protect its soft body. As it grows in size, the hermit crab must find a larger shell.
When danger threatens, it hides in the shell and closes the entrance with its hard
claw. Hermit crabs are omnivores and scavengers. They eat worms, plankton, and
organic debris.
Although land-based, these crabs must return to the sea to breed. Both males and
females partially emerge from their shells to mate. The female lays her hundreds of
eggs inside the borrowed shell. These eggs are safe and damp in the shell but, when
they hatch, they must be released in the sea. The young are in danger until they find
a shell of their own. When they reach adulthood, the crabs migrate to begin their
terrestrial life. Land hermit crabs live about 10 years.