Enterprise JavaBeans, Fourth Edition

Colophon

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The animals on the cover of Enterprise JavaBeans, Fourth Edition, are a wallaby and her joey. Wallabies are middle-sized marsupials belonging to the kangaroo family (Macropodidae, the second-largest marsupial family). They are grazers and browsers, native to Australia and found in a variety of habitats on that continent. Female wallabies have a well-developed anterior pouch in which they hold their young. When they are born, the tiny, still-blind joeys instinctively crawl up into their mothers’ pouches and begin to nurse. They stay in the pouch until they are fairly well-grown. A female wallaby can support joeys from up to three litters at once: one in her uterus, one in her pouch, and one that has graduated from the pouch but still returns to nurse.

Like all Macropodidae, wallabies have long, narrow hind feet and powerful hind limbs. Their long, heavy tails are used primarily for balance and stability and are not prehensile. Wallabies resemble kangaroos, but are smaller: they can measure any-where from less than two feet to over five feet long, with the tail accounting for nearly half of their total length. Oddly enough, although they can hop along quite quickly (reaching speeds of up to 50 km/h), it is physically impossible for ...