java(eclipse)UML工具 umlet
umlet 使用java编写的一款小型uml工具，可以作为eclipse的插件安装，也可以独立运行。
umlet真可谓短小精悍，非常之小，容易上手，我喜欢这样简单实用的软件。
umlet不支持反向等高级功能。
UMLet is a UML tool aimed at providing a fast way of creating UML diagrams. UML elements are modified using text input instead of pop-up dialogs. Elements can be modified and used as templates; this way, users can easily tailor UMLet to their modeling needs. UMLet supports a variety of UML diagram types: class diagrams, use case diagrams, sequence diagrams, state diagrams, deployment diagrams, activity diagrams -- see some examples.
UMLet allows users to create their own custom UML elements. An element's look can be modified at run-time by changing a few lines of Java code; UMLet then compiles the new element's code on the fly. Without leaving UMLet, users can thus create and add new element types to their diagrams.
UMLet's design goals are also described in this paper and this one. The custom elements' concept is describedhere. Another simple UML tool is Violet.
www.umlet.com
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什么是反射
java程序可以在运行期间动态的加载、解析和使用一些在编译阶段并不确定的类型，这一机制被称为“反射（reflection）”或者“内省（introspection）”.
反射机制提供的功能
1，加载运行时才能确定的类型
......
public class OperatExcel
{
private File file = new File(ParamenterInit.SRCEXCELPATH);
private File outfile = new File(ParamenterInit.DESTEXCELPATH);
private static String sheetName = ParamenterInit.SHEETNAME;
......
Java下的一个简单易用的反编译工具jad
,
可以很方便的将.class反编译为.Java.
一、基本用法
Usage:jad
[option(s)]
直接输入类文件名，且支持通配符，如下所示。
c:\Java\>jad
example1.class
c:\Java\>jad
*.class
结果是将example1.class反编译为example1.jad
。将
example1.jad
改为exampl ......
虽然经常创建多个不相同的线程来完成不相关的任务，然而有时执行的任务可能有一定联系，这样就需要使这些线程进行交互。比如有一个水塘，其中对水塘操作无非包括“进水”和“排水”，这两个行为各自代表一个线程，当水塘中没有水时，“排水”行为不能再进行� ......
