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写一个程序，实现任意类型文件的复制。从命令行输入原始文件名，输出文件与原始文件同名但扩展名为.bak。程序文件命名为Exe6_1.java。(Write a program that, for any type of file replication. From the command line input to the original file name, output file with the original file name and extension of.Bak. Program file named Exe6_1.java. )

Access midi and sf2 through java

简单的地铁和城铁运行调度系统，模拟实现车次的调度。(Metro Train System)

这个程序主要是用来显示日历的，可根据面板改变显示(This procedure is mainly used to display the calendar can be changed under the panel show)

java开发常用单词，北京尚学堂出品。。。。。。(Java develops commonly used words, which are produced by Beijing Shangxue School.)

Mybatis3中文开发文档,ibatis的最新版本开发文档(Mybatis3 Chinese development of documents, the latest version of ibatis development of documents )

说明：  仓库管理系统主要包括以下功能。 1. 仓库管理：主要实现对仓库进货、出货、商品调拨和商品图片信息进行管理 2. 商品查询：主要实现查询商品的库存情况，对商品的调拨、进货、出货、缺货情况和商评的图片信息做出记录 3. 系统设置：系统设置实现供应商信息、仓库信息和账号信息的添加、删除和修改。(The warehouse management system mainly includes the following functions. 1. Warehouse management: mainly realizes the management of warehouse purchase, delivery, commodity allocation and commodity picture information. 2. Commodity inquiry: Mainly to inquire about the inventory of commodities, and record the allocation, purchase, delivery, stock out and the picture information of the evaluation of commodities. 3. System settings: System settings can add, delete and modify supplier information, warehouse information and account information.)

一个简单的银行账户管理程序，给新手用来熟悉java与练习java。(A simple bank account management procedures, to the novice to be familiar with Java and Java practice. A simple bank account management procedures, to the novice to be familiar with Java and Java practice. )

3.设计一个能够描述点（point）、线(line)、圆（circle）、矩形（rectangle）和三角形（triangle）等几何形状的类体系，能够计算不同形状的周长和面积（如果能够定义的话）。程序文件命名为Exe3_3.java。(3. Design a point can be described (point), line (line), circle (circle), class hierarchy rectangle (rectangle) and the triangle (triangle) and other geometric shapes, different shapes can calculate perimeter and area (if you can define if). Program file named Exe3_3.java.)

设计一个处理复数运算的类，该类中至少有两个成员方法： 复数加法和复数减法运算。 在上述类中添加两个静态方法：求一个复数的模和求一个复 数的复角。 设计一个子类，该子类继承了上述的类，并且至少拥有自己 的两个方法：复数乘法和复数除法。 再设计一个类，包含main方法，对上面的类进行应用与测试。 该作业要求编程并调试通过。对你设计的类要有详细的文字 说明（类所封装的内容，属性、方法的功能与含义等）(The design of a complex operation processing class, at least two members of the methods in this class. Complex addition and subtraction.)