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java 基础教学，实现加减乘除功能，简易计算器。(java-based teaching, implement arithmetic functions, simple calculator.)

一种蓝牙定位的java程序，功能完善，实现质心定位，三边定位和最小二乘算法，通过布置蓝牙的位置，定位精度在0.5M左右(A bluetooth positioning Java program, the function is perfect, realize the centroid localization, trilateral positioning and least squares algorithm, through the arrangement of the position of the bluetooth, positioning accuracy at about 0.5 M)

用java编写实现了cityGML的数据格式转换问题，用cityGML4j开发包实现从obj数据格式转换为citygml格式(Written with java achieve cityGML data format conversion, from a development kit with cityGML4j obj format data format to citygml)

List of Phone-specific settings screens.

Oak是 一 种 用 于 网 络 的 精 巧 而 安 全 的 语 言，学习指南(Oak is a sophisticated network for security and the language, learning guide)

是著名的jforum论坛的2.18版，所有的完整源码，使用的是他们自己的框架，没有用Struts看起来回有点麻烦(jforum)

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本次上传的学习资料为，深入java虚拟机的讲解(Depth java virtual machine)

说明：  实现扑克牌，一副牌中抽去大小王剩下52张（如果初练也可只用1～10这40张牌)，任意抽取4张牌（称牌组)，用加、减、乘、除（可加括号)把牌面上的数算成24。每张牌必须用一次且只能用一次，如抽出的牌是3、8、8、9，那么算式为（9-8)×8×3或3×8+（9-8)或（9- 8÷8)×3等。(In order to realize playing cards, 52 cards are removed from a deck (only 40 cards can be used for the first practice). Four cards are randomly selected (called card groups). The number on the deck is calculated as 24 by adding, subtracting, multiplying and dividing (brackets can be added). Each card must be used once and only once. If the drawn card is 3, 8, 8, 9, the formula is (9-8)*8*3 or 3*8+ (9-8) or (9-8 8)*3)

特征线法设计二维风洞喷管,具体理论可参见气体动力学教材(design of two dimensional nozzle by characteristic method)