Why base abstract factory is needed Abstract factory pattern?

In Abstract Factory Pattern the major entities involved are Abstract Base Factory Concrete Factories each extending Abstract base factory Client code Base product Concrete product classes extending Base product I have seen at various implementations and observed that the Client code knows about the concrete factories. As per the common definition of the pattern I have seen at various

为什么需要基地抽象工厂抽象工厂模式?

在抽象工厂模式中涉及的主要实体是 抽象基地工厂 具体工厂每个扩展抽象基地工厂 客户端代码 基础产品 具体产品类扩展基础产品 我已经看到了各种实现,并观察到客户端代码知道具体的工厂。 根据我在不同地方看到的模式的通用定义如下 定义创建对象的接口,但让子类决定实例化哪个类。 根据我的观察, createProduct在抽象工厂方法中被实现为抽象方法。 它暴露了一个非抽象的公共方法,比如getProduct从调用crea

Java using more memory than the allocated memory

An Apache Tomcat (Atlassian Confluence) instance is started using the following Java options: JAVA_OPTS="-Xms256m -Xmx512m -XX:MaxPermSize=256m -Djava.awt.headless=true " However I see that after starting up it quickly eats through most of the 1GB of memory that is available on my virtual server. PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6082 root 19 0 1105m 7

Java使用比分配内存更多的内存

使用以下Java选项启动Apache Tomcat(Atlassian Confluence)实例: JAVA_OPTS="-Xms256m -Xmx512m -XX:MaxPermSize=256m -Djava.awt.headless=true " 不过,我发现在启动后,它可以快速浏览虚拟服务器上可用的大部分内存。 PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6082 root 19 0 1105m 760m 16m S 0.7 74.2 5:20.51 java 不应该将总体消耗的内存(堆+ PermGen)保持在使用-Xmx

ClassCastException caused by bug in Just In Time?

Given this piece of code : public static void writeFile(File file,List buffer)throws IOException{ File fic = new File(file.getCanonicalPath()); cat.debug("writing file : "+fic.getAbsolutePath()); FileOutputStream out = new FileOutputStream(fic); PrintStream ps = new PrintStream(out); for(int i=0;i<buffer.size();i++){ ps.println(buffer.get(i)); } ps.flush();

由Just In Time中的错误导致的ClassCastException?

鉴于这段代码: public static void writeFile(File file,List buffer)throws IOException{ File fic = new File(file.getCanonicalPath()); cat.debug("writing file : "+fic.getAbsolutePath()); FileOutputStream out = new FileOutputStream(fic); PrintStream ps = new PrintStream(out); for(int i=0;i<buffer.size();i++){ ps.println(buffer.get(i)); } ps.flush(); ps.clos

Converting from a Euler ZXZ rotation, to fixed axis XYZ rotations

The problem i have, is that i need to convert from XYZ fixed axis rotations, to Euler rotations about Z, then X', then Z''. Here are the relevant matrices: X: Y: Z: Combined, as Rz(psi) Ry(phi) Rx(theta) = Rxyz(theta,phi,psi); they give: Rxyz: And the Rotation matrix for the Specific convention of Euler angles i want; is this: Euler: So my initial plan, was to comp

从欧拉ZXZ旋转转换到固定轴XYZ旋转

我有的问题是,我需要从XYZ固定轴旋转转换到欧拉旋转大约Z,然后X',然后Z''。 这里是相关的矩阵: X: Y: Z: 组合,如Rz(psi)Ry(R)Rx(theta)= Rxyz(theta,phi,psi); 他们给: Rxyz: 和我想要的欧拉角具体惯例的旋转矩阵; 这是: 欧拉: 所以我最初的计划是比较矩阵元素,并提取我想要的角度; 我想出了这个(最终的实际当前代码): 但在几种情况下这不起作用。 Cos(theta)C

Regular expression to split by forward slash

I have a parse tree which includes some information. To extract the information that I need, I am using a code which splits the string based on forward slash ( / ), but that is not a perfect code. I explain more details here: I had used this code in another project earlier and that worked perfectly. But now the parse trees of my new dataset are more complicated and the code makes wrong decis

正则表达式用正斜杠分割

我有一个包含一些信息的解析树。 为了提取我需要的信息,我使用了一个基于正斜杠( / )分割字符串的代码,但这不是一个完美的代码。 我在这里解释更多细节: 我早些时候在另一个项目中使用过这些代码,并且工作完美。 但是现在我的新数据集的解析树更加复杂,有时代码会做出错误的决定。 解析树是这样的: (TOP~did~1~1 (S~did~2~2 (NPB~I~1~1 I/PRP ) (VP~did~3~1 did/VBD not/RB (VP~read~2~1 read/VB (NPB~article~2~

points Trilateration to be used with beacon data on Android

I've been struggling for a while with this, I'm currently using Estimote Beacon on Android and I'm collecting their RSSI and TxPower to calculate their range . Once I got this data and I know their position (latitude, longitude, altitude), I need to calculate my rough position for an Indoor Location purpose. All the solution provided only are either for three single points or doesn

点Trimbleration与Android上的信标数据一起使用

我一直在为此苦苦挣扎,目前我正在Android上使用Estimote Beacon,我正在收集他们的RSSI和TxPower来计算它们的范围 。 一旦我获得了这些数据并且知道他们的位置(经度,纬度,高度),我需要计算出我的粗略位置以达到室内位置的目的。 所提供的所有解决方案仅适用于三个单点或不起作用。 因为这是一个常见问题,所以必须有现有的Java解决方案。 现在我知道这是之前问过的,但在我的情况下,没有任何答案对我有帮助。 以下

Trilateration example in java

I am currently working on a program that utilizes RSSI to determine location based on signal strength. Does anybody know where a working java example is of trilateration? I couldn't find any online. The program will basically need to take in 3 distances, which are the distances derived from the RSSI's and then the latitude and longitude of the three points and then determine the user&

Java中的三角化示例

我目前正在研究利用RSSI来确定基于信号强度的位置的程序。 有没有人知道一个正在工作的java示例在哪里? 我找不到任何在线。 该程序基本上需要采取3距离,这是从RSSI的距离,然后三个点的纬度和经度,然后确定用户的位置使用二维三边测量(我忽略了每个信标的高度为现在)。 我在这里看到了一个Python,但我不太了解Python。 对于任何有同样问题的人的未来参考。 我只是使用了Girish提供的链接。 http://code.google.

Reduce Complexity. Find closest pair of latitudes and longitudes

I have two arrays representing two different GPS paths. Each array contains latitudes in the even indices(starting from 0) and longitudes in the odd indices as shown below : 48.855002219371706,2.3472976684570312,48.855050000000006,2.34735,48.85508,2.3473200000000003,48.85584,2.3477300000000003,48.8562,2.3465000000000003,... I would like to calculate the sum of the distances between the closest

降低复杂性。 找到最接近的一对纬度和经度

我有两个数组代表两个不同的GPS路径。 每个数组包含偶数索引(从0开始)和奇数索引的经度纬度,如下所示: 48.855002219371706,2.3472976684570312,48.855050000000006,2.34735,48.85508,2.3473200000000003,48.85584,2.3477300000000003,48.8562,2.3465000000000003,... 我想计算这两条路径最近点之间的距离总和。 我使用Haversine方法计算纬度和经度对之间的距离。 这就是我所做的:我搜索当前阵列中距离最短的一对纬度

Check if a latitude and longitude is within a circle

See this illustration: What I would like to know is: How to create an area (circle) when given a latitude and longitude and the distance (10 kilometers) How to check (calculate) if a latitude and longitude is either inside or outside the area I would prefer if you can give me code example in Java or specifically for Android with Google Maps API V2 What you basically need, is the distanc

检查经度和纬度是否在一个圆圈内

看到这个插图: 我想知道的是: 在给定经纬度和距离(10公里)时如何创建一个区域(圆圈) 如何检查(计算)经纬度是在区域内还是区域外 如果您可以使用Google Maps API V2为我提供Java代码示例或专门针对Android的代码示例,我宁愿选择 你基本需要的是地图上点到点之间的距离: float[] results = new float[1]; Location.distanceBetween(centerLatitude, centerLongitude, testLatitude, testLongitude, results);

Java: Calculate distance between a large number of locations and performance

I'm creating an application that will tell a user how far away a large number of points are from their current position. Each point has a longitude and latitude. I've read over this article http://www.movable-type.co.uk/scripts/latlong.html and seen this post Calculate distance in meters when you know longitude and latitude in java There are a number of calculations (50-200) that

Java:计算大量位置和性能之间的距离

我正在创建一个应用程序,告诉用户距离当前位置有多远的点数。 每个点都有经度和纬度。 我读过这篇文章http://www.movable-type.co.uk/scripts/latlong.html 并看到这篇文章计算以米为单位的距离,当你知道java中的经度和纬度时 有一些需要进行的计算(50-200)。 如果速度比这些计算的准确性更重要,哪一个最好? 这是O(n)不要担心表现。 除非每一次计算都花费太长时间(它不是)。 正如Imre所说,这是O(n)