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  • pixel difference

    - by J J
    i m a beginner in java programming. i have to submit project of server- client and stuck in pixel comparision .acc to code it accepts buffered image and compares pixel how to store pixel difference in 2nd image itself and return it?? do help with code?

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  • Polymorphic call

    - by harigm
    I am new to java, I have seen in the code at many places where my seniors have declared as List myList = new ArrayList(); (option1) Instead of ArrayList myList = new ArrayList(); (option2) Can you please tell me why people use Option1, is there any advantages? If we use option2, do we miss out any advantages or features?

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  • Is instanceof considered bad practice? If so, under what circumstances is instanceof still preferabl

    - by aioobe
    Over the years, I've tried to avoid instanceof whenever possible. Using polymorphism or the visitor pattern where applicable. I suppose it simply eases maintenance in some situations... Are there any other drawbacks that one should be aware of? I do however see it here and there in the Java libraries so I suppose it has its place? Under what circumstances is it preferable? Is it ever unavoidable?

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  • object array mobile development

    - by mixm
    Im currently creating a tile-based game for android. Using java via dalvik JVM. im fretting over a decision to represent objects in a particular map. should i use an id based map (2 dimensional integer array) and place game logic in a separate function in the game engine, or create an object array (2 dimensional array of game objects) and store game logic within the class methods. i am thinking about the cost of object creation and garbage collection vs extensibility.

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  • Code cleanup in netbeans

    - by Kapsh
    Is there something similar to the Eclipse cleanup rules ((Preferences Java Code Style Clean Up) in NetBeans? The cleanup rules in eclipse will allow you to clean things up like organizing imports, removing unnecessary casts, adding missing override annotations etc. Also can you do that on a whole set of classes/packages instead of individual classes?

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  • Method overriding

    - by Gandalf StormCrow
    Can you override method in java without using annotations? Because eclipse doesn't support it if you use JRE6, you need to switch back to 5 to use @Override annotation. Will this method be overriden if I remove the annotation? @Override public String toString() { return name + " [" + genre + "]"; }

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  • I need to parse non well-formed xml data (HTML)

    - by Daziplqa
    Hi, I have some non well-formed xml (HTML) data in JAVA, I used JAXP Dom, but It complains. The Question is :Is there any way to use JAXP to parse such documents ?? I have a file containing data such as : <employee> <name value="ahmed" > <!-- note, this element is not closed, So it is not well-formed xml--> </employee>

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  • Implement Custom Logger with slf4j

    - by Martin Dürrmeier
    I want to implement a Custom logger which logs all log entries to a Database. Currently my app logs this way (slf4j and log4j binding): private static final Logger logger = LoggerFactory.getLogger( MyClass.class ); I'm not sure how to proceed. My Idea is to implement a Custom Logging binding through implementing the org.slf4j.Logger Interface What would be the next steps? My target is to not change the current code Links I considered: http://stackoverflow.com/questions/1770442/java-custom-logger-logging-standards-or-and-best-practices http://www.slf4j.org/manual.html

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  • Word XML to RTF conversion

    - by Chathuranga Chandrasekara
    I am in a need of programatically convert an Word-XML file into a RTF file. It has become a requirement, because of some third party libraries. Any API/Library that can do that? Actually the language is not a problem because I just need to work done. But Java, .NET languages or Python are preferred.

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  • Convert JSON structure

    - by Scobal
    I have a set of data in one JSON structure: [[task1, 10, 99], [task2, 10, 99], [task3, 10, 99], [task1, 11, 99], [task2, 11, 99], [task3, 11, 99]] and need to convert it to another JSON structure: [{ label: "task1", data: [[10, 99], [11, 99]] }, { label: "task2", data: [[10, 99], [11, 99]] }, { label: "task3", data: [[10, 99], [11, 99]] }] What's the best way to do this with javascript/java?

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  • How to use second level cache for lazy loaded collections in Hibernate?

    - by Chandru
    Let's say I have two entities, Employee and Skill. Every employee has a set of skills. Now when I load the skills lazily through the Employee instances the cache is not used for skills in different instances of Employee. Let's Consider the following data set. Employee - 1 : Java, PHP Employee - 2 : Java, PHP When I load Employee - 2 after Employee - 1, I do not want hibernate to hit the database to get the skills and instead use the Skill instances already available in cache. Is this possible? If so how? Hibernate Configuration <session-factory> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.password">pass</property> <property name="hibernate.connection.url">jdbc:mysql://localhost/cache</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</property> <property name="hibernate.cache.use_second_level_cache">true</property> <property name="hibernate.cache.use_query_cache">true</property> <property name="hibernate.cache.provider_class">net.sf.ehcache.hibernate.EhCacheProvider</property> <property name="hibernate.hbm2ddl.auto">update</property> <property name="hibernate.show_sql">true</property> <mapping class="org.cache.models.Employee" /> <mapping class="org.cache.models.Skill" /> </session-factory> The Entities with imports, getters and setters Removed @Entity @Table(name = "employee") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class Employee { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String name; public Employee() { } @ManyToMany @JoinTable(name = "employee_skills", joinColumns = @JoinColumn(name = "employee_id"), inverseJoinColumns = @JoinColumn(name = "skill_id")) @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) private List<Skill> skills; } @Entity @Table(name = "skill") @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class Skill { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private int id; private String name; } SQL for Loading the Second Employee and his Skills Hibernate: select employee0_.id as id0_0_, employee0_.name as name0_0_ from employee employee0_ where employee0_.id=? Hibernate: select skills0_.employee_id as employee1_1_, skills0_.skill_id as skill2_1_, skill1_.id as id1_0_, skill1_.name as name1_0_ from employee_skills skills0_ left outer join skill skill1_ on skills0_.skill_id=skill1_.id where skills0_.employee_id=? In that I specifically want to avoid the second query as the first one is unavoidable anyway.

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  • partial classes/partial class file

    - by Ravisha
    In C# .net there is a provision to have two different class files and make them a single class using the keyword partial keyword.this helps it to keep [for ex]UI and logic seperate. of course we can have two classes to achieve this one for UI and other for logic. Can this be achieved in java some how?

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  • Can standard Sun javac do incremental compiling?

    - by calavera.info
    Recently I started to use Eclipse's java compiler, because it is significantly faster than standard javac. I was told that it's faster because it performs incremental compiling. But I'm still a bit unsure about this since I can't find any authoritative documentation about both - eclispse's and sun's - compilers "incremental feature". Is it true that Sun's compiler always compiles every source file and Eclipse's compiler compile only changed files and those that are affected by such a change?

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  • Swt combobox name/key pair

    - by zachary
    I want to have the text say one thing, but have the value say another Text Key But it only takes a string for adding items. How do Java programmers typically store text/id pairs in comboboxes

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  • Binary socket and policy file in Flex

    - by Daniil
    Hi, I'm trying to evaluate whether Flex can access binary sockets. Seems that there's a class calles Socket (flex.net package). The requirement is that Flex will connect to a server serving binary data. It will then subscribe to data and receive the feed which it will interpret and display as a chart. I've never worked with Flex, my experience lies with Java, so everything is new to me. So I'm trying to quickly set something simple up. The Java server expects the following: DataInputStream in = ..... byte cmd = in.readByte(); int size = in.readByte(); byte[] buf = new byte[size]; in.readFully(buf); ... do some stuff and send binary data in something like out.writeByte(1); out.writeInt(10000); ... etc... Flex, needs to connect to a localhost:6666 do the handshake and read data. I got something like this: try { var socket:Socket = new Socket(); socket.connect('192.168.110.1', 9999); Alert.show('Connected.'); socket.writeByte(108); // 'l' socket.writeByte(115); // 's' socket.writeByte(4); socket.writeMultiByte('HHHH', 'ISO-8859-1'); socket.flush(); } catch (err:Error) { Alert.show(err.message + ": " + err.toString()); } The first thing is that Flex does a <policy-file-request/>. I've modified the server to respond with: <?xml version="1.0"?> <!DOCTYPE cross-domain-policy SYSTEM "/xml/dtds/cross-domain-policy.dtd"> <cross-domain-policy> <site-control permitted-cross-domain-policies="master-only"/> <allow-access-from domain="192.168.110.1" to-ports="*" /> </cross-domain-policy> After that - EOFException happens on the server and that's it. So the question is, am I approaching whole streaming data issue wrong when it comes to Flex? Am I sending the policy file wrong? Unfortunately, I can't seem to find a good solid example of how to do it. It seems to me that Flex can do binary Client-Server application, but I personally lack some basic knowledge when doing it. I'm using Flex 3.5 in IntelliJ IDEA IDE. Any help is appreciated. Thank you!

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  • Gradle directory stucture

    - by liam.j.bennett
    I am working on a java Ant+Ivy based project that has the following directory structure: projectRoot/src projectRoot/classes projectRoot/conf projectRoot/webservices this works perfectly well in Ant but I am looking to migrate to Gradle. Is there a way to define a non-maven directory structure in gradle or should I be looking to mavenize?

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  • junit4 test runner

    - by lamisse
    hello how could we uses junir related methods? could we launch setuponce from each java test? if in my test I launch the appli by calling setuponce, is it correct ?

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  • Problem of * in Command line argument

    - by Nithya
    Hi, This is simple question only... i did a program in java that accepts input via command line arguments. I get input of two numbers and operator in command line. multiplying two numbers, i have to give input as 5 3 *. But if i give like this, i cant get answer. Y its not accept * in cmd.... waiting for reply guys...

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