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Mail list �_�N��－JCoverage is dead?

肖鹏 — Sat, 16 Sep 2006 01:59:00 GMT

avg_3000 wrote:
> Hi,
>
> Can you suggest a tutorial site for junit and jcoverage that covers
> from the grassroot level since I have no idea on how to use this tools
> in java.

jcoverage is as good as dead. Use Cobertura, which is its replacement.
Cobertura has documentation for running it in Ant; it's even easier in
Maven.
Take a look at <http://cobertura.sourceforge.net/anttaskreference.html>,
since that's what Google would probably have pulled up if you'd searched.

�l�合使用JUnit和Cobertura可能是不错的选择�?/p>

肖鹏 2006-09-16 09:59 发表评论

设计模式漫谈�Q?�Q�：Factory Method可以用static实现吗？

肖鹏 — Sun, 03 Sep 2006 06:21:00 GMT

〔本站副站发布，�ȝ��Q�designpatterns.cnblogs.com�?/p>

○。背景与背景知识

�q�是昨天在QQ上�D的一个例子。本文�ƈ不是从头讲Factory Method模式�Q�仅对其实现�l�节�q�行讨论。关于这个模式可以参�?a target="_blank">wayfarer�?a target="_blank">吕震�?/a>的文章�?/p>

一。分�?/p>

因�ؓFactory Method�Q�大写的Factory Method表示模式名称�Q�模式的一个目的就是��得创��为（factory method�Q�（��写的factory method表示创徏行�ؓ�Ҏ��Q�抽象化�Q�由子类实现�Q�从而容易扩展。一个纯的Factory Method模式�Q�其factory method是不能用static来实现的。通常Simple Factory模式才会由static来实现�?/p>

但是�Q�一个Factory拥有一个static的创建方法是很诱人的。用户在��M��时候只要用�c�d��Q�Factory的类名）既可以创建出需要的Product�?a target="_blank">wayfarer 的文章最后给出的DotNet的实现部分就是这��L��例子。吕震宇的另一��?a >文章 �Q�关于Simple Factory模式�Q�的回复�?a >Walkdan�l�出的解��x��案也是这��L��。从本质上，�q�两个例子都不是�U�的Factory Method模式或者Simple Factory模式�Q�而是Simple Factory模式和Factory Method模式的组合应用�?/p>

引用Walkdan的回复：

Simple Factory最大的好处是把变化集中��C��一处。另外，LightSimpleFactory.Create()里面的依赖关�p�M��可以消除�Q�我的做法是:

1. 声明构造子

public interface ILightCreator
{
    Light Create();
}

public class BulbLightCreator: ILightCreator
{
public Light Create()
    {
return new BulbLight();
    }
}
.

2. 注册构造子

creators.Register("Bulb", new BulbLightCreator());
creators.Register("Tube", new TubeLightCreator());
.

3. Simple Factory中创建对象�?/em>

public class LightSimpleFactory.Create(string lightType)
{
    ILightCreator creator = creators.Find(lightType);
return creator.Create();
}

构造子其实��是Factory Method。这�? 通过注册构造子�Q?.中原来的switch()�q�程被消除，依赖关系随之解除。其中的Register(), Find()�Ҏ��理解�Q�方法就不写了�?/em>

新的�c�d��可通过新注册构造子来实现扩展。当�?中的注册代码仅仅是示例，完全可以攑ֈ�配置文�g中去实现�Q�比如：

其ILightCreator�l�承体系�Q�是Factory Method模式。LightSimpleFactory和creators的关�p�Walkdan没有说明�Q�也可实��CؓStrategy模式�?/p>
二。引申问�?/p>

模式中factory method一定要是抽象的吗？ NO.你可以定义一个默认的�Ҏ��Q�生产某�U�Product。这样即使Factory没有子类也可以生产这�U�默认��品。通常�q�种情况下Factory是一个接口，然后定义一个BasicFactory来生产BasicProduct。其他的Factory由BasicFactory�z��。注意，往往Factory和Product是��^行的�l�承�l�构�?

Factory Method解耦了client和concreteProduct�Q�是不是又引入了client和concreteFactory的耦合�Q?�q�个问题很好�Q�答案是可能�Q�《head first design patterns》一书中的例子就有这个问题）�Q�但是client端不应该依赖concreteFactory。如果依赖concreteFactory�Q�那真是画蛇添��了（�?a target="_blank">wayfarer的文章）�?

Factory Method模式的好处有哪些�Q?
��装了对象的创徏。对象的创徏如果使用new来完成，则与实现�c�（concreteProduct�Q�是紧耦合的。Factory Method的创��为factory method�Q�返回Product接口�Q�从而解耦了client和concreteProduct�?
易于扩展。相对于Simple Factory模式�Q�Factory Method模式可以通过�z��q�行扩展�?/li>

三。结�?/p>
一个纯的Factory Method模式其factory method不可以用static实现�Q�通过与其他模式结合��用可以进行变通。而且通常情况下Factory Method模式都会与其他模式相�l�合。Abstract Factory模式通常��是用Factory Method模式来实现�?/p>

肖鹏 2006-09-03 14:21 发表评论

�Ƣ迎加入设计模式QQ��：26227899

肖鹏 — Sat, 02 Sep 2006 14:05:00 GMT
�Ƣ迎大家加入�Q?br />1.��M��心得交流�Q�大家可以相�U�一赯��书互�怺��?br />2.技术交��，��M��与设计模式相养I��包括重构�Q�测试驱动，敏捷开发等�Q�开发中遇到的问题�?br />要求臛_��发表�q�一��关于设计模式的文章才可以加入�?br />http://group.qq.com/group_index.shtml?funcid=1&groupid=26227899
友情提示�Q�如果你只打��“听”，不打��“说”或者“问”，对你的帮助会��的多�?br />

肖鹏 2006-09-02 22:05 发表评论

Effective Java 阅读�W�记�Q�－�W�一章，引言

肖鹏 — Sun, 20 Aug 2006 06:12:00 GMT

本书中的大多数原则源于少数几条基本原则�?/p>
1.清晰性和��介性是最为重要的�Q�一个模块的用户永远也不应该被模块的行�ؓ所�q�h��Q�那样就不清��C��Q�；模块要尽可能的小�Q�但又不能太��〔术语模块（module�Q�在本书中的用法�Q�是指�Q何可重用的��Y件组�Ӟ��从单个方法，到包含多个包的复杂系�l�都可以是一个模块〕�?/p>
2.代码应该被重用，而不是被拯��?/p>
3.模块之间的相依性应该尽可能降低到最��?/p>
4.错误应该��早被检��出来，理想情况下是在编译时刅R�?/p>

肖鹏 2006-08-20 14:12 发表评论

Temporary Post Used For Style Detection (afe811f5-b525-4432-b217-3d8a8e77d2d1)

肖鹏 — Sun, 20 Aug 2006 06:02:00 GMT

This is a temporary post that was not deleted. Please delete this manually. (e6a97894-4dd8-4eed-8ba1-b291c8b2bc96)

肖鹏 2006-08-20 14:02 发表评论

肖鹏 — Thu, 27 Jul 2006 08:23:00 GMT
Ant �Ҏ��件名是区分大��写�?img src ="http://www.aygfsteel.com/Pragmatic/aggbug/60375.html" width = "1" height = "1" />

肖鹏 2006-07-27 16:23 发表评论

肖鹏 — Tue, 18 Jul 2006 01:57:00 GMT
0.引子
通常一个TreeNode �Q�DefaultMutableTreeNode�Q�如果没有子�l�点�Q�它的节�Ҏ��C�Zؓ不可展开的节点，有时候我们希望即使该节点暂时没有装蝲子结点仍然显�C�Zؓ可展开的节点（如图�Q�。比如，当加载子�l�点比较耗时或者需要动态刷斎ͼ�可以延时加蝲子结点，卛_��展开节点的时候再去装载子�l�点�?br />1.由来及解��x��?br />该属性取决于�Q�DefaultTreeModel的isLeaf�Ҏ��
    /** * Returns whether the specified node is a leaf node. * The way the test is performed depends on the * askAllowsChildren setting. * * @param node the node to check * @return true if the node is a leaf node * * @see #asksAllowsChildren * @see TreeModel#isLeaf */ publicboolean isLeaf(Object node) { if(asksAllowsChildren) return !((TreeNode)node).getAllowsChildren(); return ((TreeNode)node).isLeaf(); }
而asksAllowsChildren由方法setAsksAllowsChildren讑֮�
    /** * Sets whether or not to test leafness by asking getAllowsChildren() * or isLeaf() to the TreeNodes. If newvalue is true, getAllowsChildren() * is messaged, otherwise isLeaf() is messaged. */ publicvoid setAsksAllowsChildren(boolean newValue) { asksAllowsChildren = newValue; }
注意�Q�在setRoot时可以只讑֮�一��?br />
       model.setRoot(root); /* * Since nodes are added dynamically in this application, the only true * leaf nodes are nodes that don't allow children to be added. (By * default, askAllowsChildren is false and all nodes without children * are considered to be leaves.) * * But there's a complication: when the tree structure changes, JTree * pre-expands the root node unless it's a leaf. To avoid having the * root pre-expanded, we set askAllowsChildren *after* assigning the * new root. */ model.setAsksAllowsChildren(true);
而在调用model.nodeStructureChanged(node)前后要分别设�|��ؓfalse和true。这是因为nodeStructureChanged会自动的试图展开节点node�Q�如果isLeaf�q�回为false。试惻I��asksAllowsChildren�q�回true�Q�则一个结点即使没有子�l�点�Q�只要设�|�了allowsChildren�Q�对应的treeNodeModel的isLeaf��׃��q�回true。然而当自动展开节点的时候发现�ƈ没有子结点，当然��׃��把图�?img height="10" alt="ParentNode.jpg" src="http://www.aygfsteel.com/images/blogjava_net/pragmatic/JTips/ParentNode.jpg" width="15" border="0" />��L��了。而先把asksAllowsChildren设�ؓfalse�Q�就不会去试囑ֱ�开该节点，然后设�ؓtrue�Q�该节点��׃��昄��?img height="10" alt="ParentNode.jpg" src="http://www.aygfsteel.com/images/blogjava_net/pragmatic/JTips/ParentNode.jpg" width="15" border="0" />�?/font>
    /** * Determines whether or not this node is allowed to have children. * If allows is false, all of this node's children are * removed. *
* Note: By default, a node allows children. * * @param allows true if this node is allowed to have children */ publicvoid setAllowsChildren(boolean allows) { if (allows != allowsChildren) { allowsChildren = allows; if (!allowsChildren) { removeAllChildren(); } } }
node.removeAllChildren(); DefaultTreeModel model = (DefaultTreeModel) cardTreeView.getModel(); /* * To avoid having JTree re-expand the root node, we disable * ask-allows-children when we notify JTree about the new node * structure. */ model.setAsksAllowsChildren(false); model.nodeStructureChanged(node); model.setAsksAllowsChildren(true);

肖鹏 2006-07-18 09:57 发表评论

Java tips(1): Vector to Array

肖鹏 — Mon, 17 Jul 2006 09:07:00 GMT

1.
       vectorObj.trimToSize();   //(optional) insure you won't have empty elements
       ArrayObj[] objs = new ArrayObj[vectorObj.size()];
       vectorObj.toArray(objs);
       return objs.
2.
       Object[] tempObjectArray = vectorObj.toArray();
       ArrayObj[] objs = new ArrayObj[ tempObjectArray.size() ];
       System.arraycopy (tempObjectArray, 0, objs, 0, objs.size() );
       return objs;

肖鹏 2006-07-17 17:07 发表评论

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Mail list �_�N��－JCoverage is dead?

设计模式漫谈�Q?�Q�：Factory Method可以用static实现吗？

�Ƣ迎加入设计模式QQ���：26227899

Effective Java 阅读�W�记�Q�－�W�一章，引言

Temporary Post Used For Style Detection (afe811f5-b525-4432-b217-3d8a8e77d2d1)

Java tips(1): Vector to Array

�Ƣ迎加入设计模式QQ��：26227899