DangDang

邮件收发系统，实现了邮件发送以及新邮件的下载以及显示(Send and receive e-mail system, the realization of the e-mail and download new messages as well as the display)

1. 分别使用Vector、Hashtable、Stack，ArrayList、LinkedList和HashSet作为容器类，实现以下要求： (1) 向容器中添加1,000,000个随机整数。 (2) 遍历容器中的所有元素。 (3) 随机产生100,000个整数，在容器中查找这些整数。 (4) 随机产生100个整数，从容器中删除这些整数。 (5) 统计完成以上各个操作需要的时间。 比较一下不同操作在不同数据结构下的性能差异。程序文件命名为Exe5_1.java。 (51 respectively using Vector, Hashtable, Stack, ArrayList, LinkedList and HashSet as the container class, to achieve the following requirements: ( 1) are added to the container 1000000 random integers. ( 2) to traverse all the elements in the container. ( 3) 100000 randomly generated integer, in the container to find these integers. ( 4) random produces 100 integers, is removed from the container of these integers. ( 5) complete the statistics above each operation requires time. Compare the different operating at different data structure performance differences. Program file named Exe5_1.java )

说明：  这是我学习cloudsim用到的讲解，对我帮助很大(This is the explanation I used to learn cloudsim, and it helped me a lot.)

Interface definition for a callback to be invoked when a menu item is clicked.

一本介绍spring security 3的书籍，挺好的(spring security 3 introduction)

Java数据库系统项目开发实践源程序第8章.rar (Java database system project development source code of practice in Chapter 8. Rar)

java画图程序，比较小巧(A very simple drawing program in Java)

说明：  飞机大战 首先对这个游戏分析,在屏幕上的物体都是飞行物,我们可以把建一个类,让其他飞行物继承这个类.游戏中应有英雄机(也就是自己控制的飞机)、敌人。而敌人应该分为打死给分的飞机（就是普通飞机），另一种就是打死有奖励的敌人。他们都应该是飞行物的子类，我们也可以为普通飞机和给奖励的敌人设一个接口让他们去实现接口，这样有利于以后的扩展，我在这里给的简化版的飞机大战，主要是为了让大家了解面向对象。(First of all, analyze the game. The objects on the screen are flying objects. We can build a class and let other flying objects inherit this class. There should be hero planes (i.e., planes controlled by ourselves) and enemies in the game. And the enemy should be divided into killing the aircraft (that is, ordinary aircraft), the other is to kill the enemy with reward. They should be subclasses of flying objects. We can also set an interface for ordinary aircraft and reward enemies to implement the interface, which is conducive to future expansion. The simplified version of aircraft War I gave here is mainly to let you understand object-oriented.)

这实一个求最短路径的实验，对初学者很有用，特别实学习　数据结构的同学(This is a shortest path experiment, very useful for beginners, in particular data structure is learning students)

java聊天软件，C/S结构， 没有使用数据库 ，Swing做的。可以多个人一起聊天，有客户端服务端，运行速度快。(the java chat C/S no database)