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Rewrite arrays using collections

- by owca

I have a task, which I was able to do with the use of simplest methods - arrays. Now I'd like to go further and redo it using some more complicated java features like collections, but I've never used anything more complicated than 2d matrix. What should I look at and how to start with it. Should Tower become a Collection ? And here's the task : We have two classes - Tower and Block. Towers are built from Blocks. Ande here's sample code for testing: Block k1=new Block("yellow",1,5,4); Block k2=new Block("blue",2,2,6); Block k3=new Block("green",3,4,2); Block k4=new Block("yellow",1,5,4); Tower tower=new Tower(); tower.add(k1,k2,k3); "Added 3 blocks." System.out.println(tower); "block: green, base: 4cm x 3cm, thicknes: 2 cm block: blue, base: 6cm x 2cm, thicknes: 2 cm block: yellow, base: 5cm x 4cm, thicknes: 1 cm" tower.add(k2); "Tower already contains this block." tower.add(k4); "Added 1 block." System.out.println(tower); "block: green, base: 4cm x 3cm, thicknes: 2 cm block: blue, base: 6cm x 2cm, thicknes: 2 cm block: yellow, base: 5cm x 4cm, thicknes: 1 cm block: yellow, base: 5cm x 4cm, thicknes: 1 cm" tower.delete(k1); "Deleted 1 block" tower.delete(k1); "Block not in tower" System.out.println(tower); "block: blue, base: 6cm x 2cm, thicknes: 2 cm block: yellow, base: 5cm x 4cm, thicknes: 1 cm block: yellow, base: 5cm x 4cm, thicknes: 1 cm" Let's say I will treat Tower as a collection of blocks. How to perform search for specific block among whole collection ? Or should I use other interface ?

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Subterranean IL: Filter exception handlers

- by Simon Cooper

Filter handlers are the second type of exception handler that aren't accessible from C#. Unlike the other handler types, which have defined conditions for when the handlers execute, filter lets you use custom logic to determine whether the handler should be run. However, similar to a catch block, the filter block does not get run if control flow exits the block without throwing an exception. Introducing filter blocks An example of a filter block in IL is the following: .try { // try block } filter { // filter block endfilter }{ // filter handler } or, in v1 syntax, TryStart: // try block TryEnd: FilterStart: // filter block HandlerStart: // filter handler HandlerEnd: .try TryStart to TryEnd filter FilterStart handler HandlerStart to HandlerEnd In the v1 syntax there is no end label specified for the filter block. This is because the filter block must come immediately before the filter handler; the end of the filter block is the start of the filter handler. The filter block indicates to the CLR whether the filter handler should be executed using a boolean value on the stack when the endfilter instruction is run; true/non-zero if it is to be executed, false/zero if it isn't. At the start of the filter block, and the corresponding filter handler, a reference to the exception thrown is pushed onto the stack as a raw object (you have to manually cast to System.Exception). The allowed IL inside a filter block is tightly controlled; you aren't allowed branches outside the block, rethrow instructions, and other exception handling clauses. You can, however, use call and callvirt instructions to call other methods. Filter block logic To demonstrate filter block logic, in this example I'm filtering on whether there's a particular key in the Data dictionary of the thrown exception: .try { // try block } filter { // Filter starts with exception object on stack // C# code: ((Exception)e).Data.Contains("MyExceptionDataKey") // only execute handler if Contains returns true castclass [mscorlib]System.Exception callvirt instance class [mscorlib]System.Collections.IDictionary [mscorlib]System.Exception::get_Data() ldstr "MyExceptionDataKey" callvirt instance bool [mscorlib]System.Collections.IDictionary::Contains(object) endfilter }{ // filter handler // Also starts off with exception object on stack callvirt instance string [mscorlib]System.Object::ToString() call void [mscorlib]System.Console::WriteLine(string) } Conclusion Filter exception handlers are another exception handler type that isn't accessible from C#, however, just like fault handlers, the behaviour can be replicated using a normal catch block: try { // try block } catch (Exception e) { if (!FilterLogic(e)) throw; // handler logic } So, it's not that great a loss, but it's still annoying that this functionality isn't directly accessible. Well, every feature starts off with minus 100 points, so it's understandable why something like this didn't make it into the C# compiler ahead of a different feature.

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Oracle's Block Browser and Editor tool

In a prior article on Oracle's Block Browser and Editor tool (BBED), the installation of the tool was covered. In this article, we'll look at starting a session using a simple database and see how to view data.

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Google Analytics: Block Your Dynamic IP Visits?

- by 4thSpace

I have a dynamic IP, which doesn't work for Google Analytics IP filtering. I read this post How to excludes my visits from Google Analytics? but don't see any code for setting the variable mentioned there. Has anyone been able to block their website visits from Google Analytics using a cookie? EDIT: This seems to work https://tools.google.com/dlpage/gaoptout. Although I don't think it was designed as I'm using it.

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Am I correct in my assumption about synchronized block?

- by kunjaan

I have a method shout() with a synchronized block. private void shout(){ System.out.println("SHOUT " + Thread.currentThread().getName()); synchronized(this){ System.out.println("Synchronized Shout" + Thread.currentThread().getName()); try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("Synchronized Shout" + Thread.currentThread().getName()); } } If I have two Threads that run this method, am I correct in assuming that the two "Synchronized Shout" will always appear one after the other? There can be no other statements in between the "Synchronized Shout"?

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Block all content on a web page for people using an Adblock-type browser add-on/extension?

- by Rudiger

I wish to block ALL my content from any users using an ad-blocking browser extension (ie. Adblock Plus for Firefox, Adthwart for Chrome). How can I acheive this? Is there a server-side solution? Client-side? Edit 1 This question regards the detection of ad-blocking browser extensions: http://stackoverflow.com/questions/1185067/detecting-adblocking-software I'm concerned with post-detection action. Edit 2 A duplicate question was asked after mine, so I thought I'd link to it here: http://stackoverflow.com/questions/2002403/prevent-adblock-users-from-accessing-website

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How can I do block-oriented disk I/O with Java? Or similar for a B+ tree

- by Sanoj

I would like to implement an B+ tree in Java and try to optimize it for disk based I/O. Is there an API for accessing individual disk blocks from Java? or is there an API that can do similar block-oriented access that fits my purpose? I would like to create something like Tokyo Cabinet in 100% Java. Is there anyone that knows what Java only databases like JavaDB is using in the back-end for this? I know that there are probably other languages than Java that can do this better, but I do this in a learning purpose only.

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.Net: What is your confident approach in "Catch" section of try-catch block, When developing CRUD op

- by odiseh

hi, I was wondering if there would be any confident approach for use in catch section of try-catch block when developing CRUD operations(specially when you use a Database as your data source) in .Net? well, what's your opinion about below lines? public int Insert(string name, Int32 employeeID, string createDate) { SqlConnection connection = new SqlConnection(); connection.ConnectionString = this._ConnectionString; try { SqlCommand command = connection.CreateCommand(); command.CommandType = CommandType.StoredProcedure; command.CommandText = "UnitInsert"; if (connection.State != ConnectionState.Open) connection.Open(); SqlCommandBuilder.DeriveParameters(command); command.Parameters["@Name"].Value = name; command.Parameters["@EmployeeID"].Value = employeeID; command.Parameters["@CreateDate"].Value = createDate; int i = command.ExecuteNonQuery(); command.Dispose(); return i; } catch { **// how do you "catch" any possible error here?** return 0; // } finally { connection.Close(); connection.Dispose(); connection = null; } }

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ASP.NET - What is the best way to block the application usage?

- by Tufo

Our clients must pay a monthly Fee... if they don't, what is the best way to block the asp.net software usage? Note: The application runs on the client own server, its not a SaaS app... My ideas are: Idea: Host a Web Service on the internet that the application will use to know if the client can use the software. Issue 1 - What happen if the client internet fails? Or the data center fails? Possible Answer: Make each web service access to send a key that is valid for 7 or 15 days, so each web service consult will enable the software to run more 7 or 15 days, this way the application will only be locked after 7 or 15 days without consulting our web servicee. Issue 2 - And if the client don't have or don't want to enable internet access to the application? Idea 2: Send a key monthly to the client. Issue - How to make a offline key? Possible Answer: Generate a Hash using the "limit" date, so each login try on software will compare the today hash with the key? Issue 2 - Where to store the key? Possible Answer: Database (not good, too easy to change), text file, registry, code file, assembly... Any opinion will be very appreciated!

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Block a website on HTTPS [closed]

- by momo1729

I would like to block some websites on their HTTPS version and allow them on HTTP. The main websites involved are Youtube and Google Images/Videos. This is because on the HTTP version, I can enforce the Safesearch filter on those platforms, whereas I cannot on the HTTPS version. For me, this is a very serious issue which spoils many great things about the Safesearch features Google offers. Is there any software/config that can do that? P.S.: I'm not sure this is the right place to post this question in, maybe you could redirect me to some other SE platform?

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Javascript : Modifying parent element from child block the web site to display

- by Suresh Behera

Well recently i was working with Dotnetnuke and we are using lots of JavaScript around this project. Internally, dotnetnuke use lot of asp.net user control which lead to have a situation where child element accessing/modifying data of parent. Here is one example the DIV element is a child container element. The SCRIPT block inside the DIV element tries to modify the BODY element. The BODY element is the unclosed parent container of the DIV element. 1: < html > 2: < body >...(read more)

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How to block third party cookies in firefox?

- by anonymous

This seems to be discussed in many places. But I don't get it or it does not work for me. So let me explain. I use Firefox 24.0 on Lubuntu 12.04. In privacy settings, I have selected 1. Use custom settings for history 2. accept cookies from sites 3. never accept third party cookies. But then when I check (e.g. in show cookies in firefox preferences or in lightbeam), it still shows me many third party cookies (e.g. google.com, facebook, etc.). What additional steps I have to take to block them?

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Adsense block not displaying anything

- by Mild Fuzz

I have copied and pasted the following code into my page, but it seems to be having no effect. It should have a fall back block colour, but nothing is showing. Code copied/pasted straight from google <script type="text/javascript"> </script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script>

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How does one block unsupported web browsers?

- by Sn3akyP3t3

Web browsers with an end of life no longer receive security updates which not only makes them vulnerable to the end user, but I imagine its not safe for the server's which receive visits by them either. Is it practical to block or enforce and notify the end user that their browser is unsafe and unsupported? If so, how would one achieve that? I don't know of any official or crowd-sourced listing with that information to parse and keep up to date. I'm aware that the practice can be custom built with User Agent parsing and feature detection for HTML5 enabled browsers.

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Allow and Block Programs in Windows 7

One of the best characteristics of Parental Controls in Windows 7 is how it can be fine tuned to fit your personal needs. Nowhere is this more apparent than in its Allow and block specific programs setting. This setting is especially useful if there are certain programs or applications that you do not want you child to use. Whether it be an Internet browser a game a tool a messaging service or anything else you can think of you have the power to keep it out of your child s hands.... Autodesk Software Download A Free Trial Of One Of Our Construction Software Solutions.

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Extended with advice: Moving block wont work in Javascript

- by Mack

Hello Note: this is an extension of a question I just asked, i have made the edits & taken the advice but still no luck I am trying to make a webpage where when you click a link, the link moves diagonally every 100 milliseconds. So I have my Javascript, but right now when I click the link nothing happens. I have run my code through JSLint (therefore changed comaprisions to === not ==, thats weird in JS?). I get this error from JSLink though: Error: Implied global: self 15,38, document 31 What do you think I am doing wrong? <script LANGUAGE="JavaScript" type = "text/javascript">  </script> <style type="text/css" media="all">  </style>

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Box2D blocky map. Body, Fixtures a huge map and performance

- by Solom

Right now I'm still in the planning phase of a my very first game. I'm creating a "Minecraft"-like game in 2D that features blocks that can be destroyed as well as players moving around the map. For creating the map I chose a 2D-Array of Integers that represent the Block ID. For testing purposes I created a huge map (16348 * 256) and in my prototype that didn't use Box2D everything worked like a charm. I only rendered those blocks that where within the bounds of my camera and got 60 fps straight. The problem started when I decided to use an existing physics-solution rather than implementing my own one. What I had was basically simple hitboxes around the blocks and then I had to manually check if the player collided with any of those in his neighborhood. For more advanced physics as well as the collision detection I want to switch over to Box2D. The problem I have right now is ... how to go about the bodies? I mean, the blocks are of a static bodytype. They don't move on their own, they just are there to be collided with. But as far as I can see it, every block needs his own body with a rectangular fixture attached to it, so as to be destroyable. But for a huge map such as mine, this turns out to be a real performance bottle-neck. (In fact even a rather small map [compared to the other] of 1024*256 is unplayable.) I mean I create thousands of thousands of blocks. Even if I just render those that are in my immediate neighborhood there are hundreds of them and (at least with the debugRenderer) I drop to 1 fps really quickly (on my own "monster machine"). I thought about strategies like creating just one body, attaching multiple fixtures and only if a fixture got hit, separate it from the body, create a new one and destroy it, but this didn't turn out quite as successful as hoped. (In fact the core just dumps. Ah hello C! I really missed you :X) Here is the code: public class Box2DGameScreen implements Screen { private World world; private Box2DDebugRenderer debugRenderer; private OrthographicCamera camera; private final float TIMESTEP = 1 / 60f; // 1/60 of a second -> 1 frame per second private final int VELOCITYITERATIONS = 8; private final int POSITIONITERATIONS = 3; private Map map; private BodyDef blockBodyDef; private FixtureDef blockFixtureDef; private BodyDef groundDef; private Body ground; private PolygonShape rectangleShape; @Override public void show() { world = new World(new Vector2(0, -9.81f), true); debugRenderer = new Box2DDebugRenderer(); camera = new OrthographicCamera(); // Pixel:Meter = 16:1 // Body definition BodyDef ballDef = new BodyDef(); ballDef.type = BodyDef.BodyType.DynamicBody; ballDef.position.set(0, 1); // Fixture definition FixtureDef ballFixtureDef = new FixtureDef(); ballFixtureDef.shape = new CircleShape(); ballFixtureDef.shape.setRadius(.5f); // 0,5 meter ballFixtureDef.restitution = 0.75f; // between 0 (not jumping up at all) and 1 (jumping up the same amount as it fell down) ballFixtureDef.density = 2.5f; // kg / m² ballFixtureDef.friction = 0.25f; // between 0 (sliding like ice) and 1 (not sliding) // world.createBody(ballDef).createFixture(ballFixtureDef); groundDef = new BodyDef(); groundDef.type = BodyDef.BodyType.StaticBody; groundDef.position.set(0, 0); ground = world.createBody(groundDef); this.map = new Map(20, 20); rectangleShape = new PolygonShape(); // rectangleShape.setAsBox(1, 1); blockFixtureDef = new FixtureDef(); // blockFixtureDef.shape = rectangleShape; blockFixtureDef.restitution = 0.1f; blockFixtureDef.density = 10f; blockFixtureDef.friction = 0.9f; } @Override public void render(float delta) { Gdx.gl.glClearColor(1, 1, 1, 1); Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT); debugRenderer.render(world, camera.combined); drawMap(); world.step(TIMESTEP, VELOCITYITERATIONS, POSITIONITERATIONS); } private void drawMap() { for(int a = 0; a < map.getHeight(); a++) { /* if(camera.position.y - (camera.viewportHeight/2) > a) continue; if(camera.position.y - (camera.viewportHeight/2) < a) break; */ for(int b = 0; b < map.getWidth(); b++) { /* if(camera.position.x - (camera.viewportWidth/2) > b) continue; if(camera.position.x - (camera.viewportWidth/2) < b) break; */ /* blockBodyDef = new BodyDef(); blockBodyDef.type = BodyDef.BodyType.StaticBody; blockBodyDef.position.set(b, a); world.createBody(blockBodyDef).createFixture(blockFixtureDef); */ PolygonShape rectangleShape = new PolygonShape(); rectangleShape.setAsBox(1, 1, new Vector2(b, a), 0); blockFixtureDef.shape = rectangleShape; ground.createFixture(blockFixtureDef); rectangleShape.dispose(); } } } @Override public void resize(int width, int height) { camera.viewportWidth = width / 16; camera.viewportHeight = height / 16; camera.update(); } @Override public void hide() { dispose(); } @Override public void pause() { } @Override public void resume() { } @Override public void dispose() { world.dispose(); debugRenderer.dispose(); } } As you can see I'm facing multiple problems here. I'm not quite sure how to check for the bounds but also if the map is bigger than 24*24 like 1024*256 Java just crashes -.-. And with 24*24 I get like 9 fps. So I'm doing something really terrible here, it seems and I assume that there most be a (much more performant) way, even with Box2D's awesome physics. Any other ideas? Thanks in advance!

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Ascii text diagrams

- by bobobobo

I'm looking for a program to convert PowerPoint block diagrams to ASCII. I found Ditaa which does the exact opposite of what I want done. Recommendations for great programs that can produce ascii block diagrams? +--------+ +-------+ +-------+ | | --+ block2+-- | | | block | +-------+ |block3 | | | | | | | | | | | | | +---+----+ +-------+ +-------+ : ^ | Lots of work | +-------------------------+ Found FossilDraw which does exactly what I want but speed perf leaves something to be desired..

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How to block subreddits with BIND9?

- by user1391189

Please help me block NSFW subreddits like this one (http://www.reddit.com/r/NSFW/) I would like to keep access to SFW subreddits, but block certain subreddits that are distracting or NSFW. I know how to filter domains. (see files below) But how do I apply the filter only to certain subreddits? So far I have set up the following files: blocklist.conf zone "adimages.go.com" { type master; file "dummy-block"; }; zone "admonitor.net" { type master; file "dummy-block"; }; zone "ads.specificpop.com" { type master; file "dummy-block"; }; ... named.conf options { allow-query { 127.0.0.1; }; allow-recursion { 127.0.0.1; }; directory "c:\bind\etc"; notify no; }; zone "." IN { type hint; file "c:\bind\etc\named.root"; }; zone "localhost" IN { allow-update { none; }; file "c:\bind\etc\localhost.zone"; type master; }; zone "0.0.127.in-addr.arpa" IN { allow-update { none; }; file "c:\bind\etc\named.local"; type master; }; key "rndc-key" { algorithm hmac-md5; secret "O5VdbBKKEMzuLYjM60CxwuLLURFA6peDYHCBvZCqjoa6KtL1ggD7OTLeLtnu2jR5I5cwA/MQ8UdHc+9tMJRSiw=="; }; controls { inet 127.0.0.1 port 953 allow { 127.0.0.1; } keys { "rndc-key"; }; }; //Blocklist include "c:\bind\etc\blocklist.conf"; dummy-block $TTL 604800 @ IN SOA localhost. root.localhost. ( 2 ; Serial 604800 ; Refresh 86400 ; Retry 2419200 ; Expire 604800 ) ; Negative Cache TTL ; @ IN NS localhost. @ IN A 127.0.0.1 * IN A 127.0.0.1

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how to block https sites on netgear router?

- by Karthick88it

I am using NETGEAR Wireless-N-300 Router Model among couple of peoples to sahre internet connectivity. I have a problem, on my company i blocked facebook.com, but the users are access on protocol https, i blocked some ip´s of facebook but they haves a lot ip, please, how to block facebook on https protocol...?? Can anybody help me for creating the block HTTPS traffic rule. Like I need to block: https://www.facebook.com/ many thanks Karthick

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performance block countries using iptables /netfilter

- by markus

It's easy to block IPs from country using iptables (e.g. like http://www.cyberciti.biz/faq/block-entier-country-using-iptables/). However I read that the performance can go down if the deny list get too large. An alternative is installing the iptables geoip patch or using ipset ( http://www.jsimmons.co.uk/2010/06/08/using-ipset-with-iptables-in-ubuntu-lts-1004-to-block-large-ip-ranges/) instead of iptables. Does anyone have experience with the various approaches and can say something about the performance differences ? Are there are other ways to block country IPs in linux which I did't mentioned above?

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pf not execute udp port specific block rule

- by seaquest

The traffic I want to block can be sniffed as below with tcpdump: 19:16:22.391164 IP 95.95.95.95.2036 > 10.10.10.10.443: UDP, length 8192 So I wanted to write a rule block any udp destination port 443 traffic. block drop quick on igb3 inet proto udp to any port 443 Traffic does not match and does not blocked. However, It matches and blocks if I write rule as below: block drop quick on igb3 inet proto udp to 10.10.10.10 Do you have any remarks? I am using pf in Freebsd.

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task manager for Internet usage, I need to block a software accessing a website/web server

- by Pennf0lio

I have a software that accesses a website, I want to monitor what website is it accessing and block that website. Is there a software similar to "windows task manager" that allows you to monitor software that accesses a website? I want to know what website/server is it accessing so I could then block it. And Is there an alternative way to block aside from "host" file? Thanks! FYI: running on Win7

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How to block a website completely?

- by user37076

I want to block some sites(e.g. youtube,news sites ), because I have a problem with procrastination and I find these websites affect my productivity very much. I used to block them by adding them to HOSTS file. However, gradually every time I want to take a break, I open the hosts file and comment my block again. Is there any way I can block the websites and cannot (at least a little bit hard, e.g. I have to reboot my pc) unblock them. I have no access to the router or any firewall, besides the ones on my computer. I just want to FORCE myself to work without any chance to procrastinate.

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Would a typical corporate firewall block a Java applet having the following behaviour

- by auser

I'm thinking of developing a proxy-like program to forward ports on a remote PC to a local PC (for example SSH). Assume that both local and remote PCs are running behind typical firewalls (i.e. consumer broadband router firewall, Windows firewall or corporate firewalls). The program will be a Java program which the user will run on both the remote and local PC. The remote client will periodically poll a central server to determine whether there are pending client connections. A session could be initiated as follows: The local client contacts the central server and request the current connection details for a specific remote client. The central server responds with the remote server's last received IP address and port. The next time the remote server polls the central server, the client's IP address and port are returned. The remote server initiates a connection to the local client using the IP address and port returned by the central server and listens for a response on a random port. The remote server will pass the value of the port it's listening on to central server. Goto 1, if client fails to connect to server. Would this work or will a typical firewall block the interactions.

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