本書提供用J B u i l d e r開發數據庫應用程序、創建分布式應用程序以及編寫J a v a B e a n
組件的高級資料。它包括下列幾個部分：
• 第一部分是“開發數據庫應用程序”，它提供關于使用J b u i l d e r的D a t a E x p r e s s數據
庫體系結構的信息，并解釋原始數據組件和類之間的相互關系，以及怎樣使用它
們來創建你的數據庫應用程序。它還解釋怎樣使用Data Modeler(數據模型器)和
Application Generator（應用程序生成器）創建數據驅動的客戶機/服務器應用程
序。
• 第二部分是“開發分布式應用程序”，它提供關于使用ORB Explorer、用J B u i l d e r
創建多級的分布應用程序、調試分布式應用程序、用J a v a定義C O R B A接口以及
使用s e r v l e t等的信息。
• 第三部分是“創建J a v a B e a n”，它解釋怎樣開發新的J a v a B e a n組件，描述在組件
開發中涉及的任務, 怎樣使用B e a n s E x p r e s s創建新的J a v a B e a n，以及關于屬性、
事件、B e a nIn f o類和其他方面的詳細情況。
The PCI Local bus concept was developed to break
the PC data I/O bottleneck and clearly opens the door
to increasing system speed and expansion capabilities.
The PCI Local bus moves high speed peripherals
from the I/O bus and places them closer to the system’s
processor bus, providing faster data transfers
between the processor and peripherals. The PCI Local
bus also addresses the industry’s need for a bus standard
which is not directly dependent on the speed,
size and type of system processor. It represents the
first microprocessor independent bus offering performance
more than adequate for the most demanding
applications such as full-motion video.
The PCI Local bus concept was developed to break
the PC data I/O bottleneck and clearly opens the door
to increasing system speed and expansion capabilities.
The PCI Local bus moves high speed peripherals
from the I/O bus and places them closer to the system’s
processor bus, providing faster data transfers
between the processor and peripherals. The PCI Local
bus also addresses the industry’s need for a bus standard
which is not directly dependent on the speed,
size and type of system processor. It represents the
first microprocessor independent bus offering performance
more than adequate for the most demanding
applications such as full-motion video.
Hardware reference
The PCI Local bus concept was developed to break
the PC data I/O bottleneck and clearly opens the door
to increasing system speed and expansion capabilities.
The PCI Local bus moves high speed peripherals
from the I/O bus and places them closer to the system’s
processor bus, providing faster data transfers
between the processor and peripherals. The PCI Local
bus also addresses the industry’s need for a bus standard
which is not directly dependent on the speed,
size and type of system processor. It represents the
first microprocessor independent bus offering performance
more than adequate for the most demanding
applications such as full-motion video.
User Manual
實現最優二叉樹的構造；在此基礎上完成哈夫曼編碼器與譯碼器。 假設報文中只會出現如下表所示的字符：
字符 A B C D E F G H I J K L M N
頻度 186 64 13 22 32 103 21 15 47 57 1 5 32 20 57
字符 O P Q R S T U V W X Y Z ， ．
頻度 63 15 1 48 51 80 23 8 18 1 16 1 6 2
要求完成的系統應具備如下的功能：
1．初始化。從終端（文件）讀入字符集的數據信息，。建立哈夫曼樹。
2．編碼：利用已建好的哈夫曼樹對明文文件進行編碼，并存入目標文件（哈夫曼碼文件）。
3．譯碼：利用已建好的哈夫曼樹對目標文件（哈夫曼碼文件）進行編碼，并存入指定的明文文件。
4．輸出哈夫曼編碼文件：輸出每一個字符的哈夫曼編碼。
