uml

I've been using NClass for object/class modeling in class thus far. However, I do not believe that it is capable of sequence diagrams, which is my next task. I would prefer not to use Visio. Is there a good and free software solution for making sequence diagrams? For me there are usually about 3 tools I prefer to use. Netbeans UML Plugin (Its free and its nice) Visual Paradigm UML (its really nice but it isn't free, you might be able to get a free academic copy, but that requires a bit of work Visio (I Know you said you didn't like it, but it works) There is www.websequencediagrams.com that is

I am reading the book Java Concurrency in Practice and getting a little bit confused with these terms: Pre condition Post condition Invariants Can someone please explain me them (with an example, if it's possible)? You'll have a lot of problems writing Java, especially multi-threaded code, if you can't understand these simple ideas: Pre-conditions are the things that must be true before a method is called. The method tells clients "this is what I expect from you". Post-conditions are the things that must be true after the method is complete. The method tells clients "this is what I promise to

I'm fond of using UML diagrams to describe my software. In the majority of cases the diagrams are for my own use and I use them for more involved pieces of code, interactions etc. where I'll benefit from being able to look back over them in the future. One thing I've found myself doing a few different ways is diagramming threads. Threads by their nature tend to pop up in the more involved pieces of code and keeping track of them is often a primary purpose of my design documents. In the past I've used a symbol in a sequence diagram to show the creation of a new thread but looking back at some

The diagram below is my very first attempt at creating a UML class diagram describing a user login into a website. I'm sure its a poor design and full of flaws, but I'm hoping to learn from you guys how you would design a simple login like this. I'm particularly interested in your use of design patterns and which patterns you would use, how you would implement it in the design, and why. Any advise, criticisms, comments and suggestions will be really appreciated. Thanks in advance. Arthur Ronald Here is how we implement this funcionallity As you can see, we have many Application (Here, it

How do I get IntelliJ 10.5 (on the Mac) to generate a class diagram showing all of the classes in my project? I'm sure I'm overlooking something obvious, but I can only get the "Show Diagram" feature to show one class at a time. (I also figured out how to add additional classes, but again, only one at a time.) Use Diagrams | Show Diagram from the context menu of a package. Invoking it on the project root will show module dependencies diagram. If you need multiple packages, you can drag&drop them to the already opened diagram for the first package and press e to expand it. Note : This feature

UML（Unified Modeling Language，统一建模语言）是一组用于描述OOAD过程的图形化表达方式。 UML为交流面向对象的设计中的需求，行为、体系结构的实现提供了一套综合的表示法。 UML绘制工具，EA 和VSU 2010 UML由9个不同类型的图组成： 用例图：显示了系统的外部可视行为。 用例图描述了系统外的人员和系统的交互动作，以及系统的响应，该类型的图可以用于描述系统的功能需求。 活动图：显示系统行为的峡谷纳西描述。 活动图描述了单个功能需求内部的细节行为，包括基本的场景和一些可选的场景。 组件图：显示了系统的体系结构。 组件图描述了系统的可部署单元（可执行文件，组件，数据存储和其他一些内容）以及一些借口，可部署单元通过这些接口进行交互，该图可以用于研究系统的体系结构。 顺序图：显示了对象随着时间的交互。 顺序图描述了某个功能需求的路径或场景内相对时间的详细行为，该图可用于理解系统元素之间的消息流程。 协作图：显示了对象的交互，强调对象之间的关系。（在UML2.0里面找不到了） 类图：显示了类的定义和关系。 类图描述了系统设计中的类和接口，以及他们之间的关系。该图可用于定义内部的，面向对象的代码结构。 状态图：显示了响应时间的状态改变。 状态图描述了系统如何改变状态以相应内部的和外部的事件，确保每个事件都被适当的处理。 部署图：显示了系统的物理体系结构。

统一建模语言简介 统一建模语言（Unified Modeling Language，UML）是用来设计软件蓝图的可视化建模语言，1997 年被国际对象管理组织（OMG）采纳为面向对象的建模语言的国际标准。它的特点是简单、统一、图形化、能表达软件设计中的动态与静态信息。 统一建模语言能为软件开发的所有阶段提供模型化和可视化支持。而且融入了软件工程领域的新思想、新方法和新技术，使软件设计人员沟通更简明，进一步缩短了设计时间，减少开发成本。它的应用领域很宽，不仅适合于一般系统的开发，而且适合于并行与分布式系统的建模。 UML 从目标系统的不同角度出发，定义了用例图、类图、对象图、状态图、活动图、时序图、协作图、构件图、部署图等 9 种图。 本教程主要介绍软件 设计模式 中经常用到的类图，以及类之间的关系。另外，在实验部分将简单介绍 UML 建模工具的使用方法，当前业界使用最广泛的是 Rational Rose。使用 Umlet 的人也很多，它是一个轻量级的开源 UML 建模工具，简单实用，常用于小型软件系统的开发与设计。 类、接口和类图 1. 类 类（Class）是指具有相同属性、方法和关系的对象的抽象，它封装了数据和行为，是面向对象程序设计（OOP）的基础，具有封装性、继承性和多态性等三大特性。在 UML 中，类使用包含类名、属性和操作且带有分隔线的矩形来表示。 (1) 类名（Name

I am creating use-case diagram. I have two actors: user and admin. Admin can check all orders, and user can check only his/her orders. Should I create two use cases in my UML diagram, or I can use one use case with condition for user actor? If I can use condition, which symbol must I use? Square brackets or curly brackets? You need to attach a constraint to either the connector, the use case or the actor (where it's most appropriate). It could look like this: Note that this is an example and contains redundant constraints which should not be done for a real UC. I believe you are doing too much