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  • When should I define an hash code function for my types?

    - by devoured elysium
    Is there any other reason for implementing an hash code function for my types other than allowing for good use of hash tables? Let's say I am designing some types that I intend to use internally. I know that types are "internal" to the system, and I also know I will never use those types in hash tables. In spite of this, I decide I will have to redefine the equals() method. Theory says I should also redefine the hash code method, but I can't see any reason why, in this case, I should do it. Can anyone point me out any other reason? This question can be rephrased to : in which situations should we implement a hash code method in our types. PS : I am not asking how to implement one. I am asking when.

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  • how does tomcat like web container handle struts 2 variables ?

    - by mobby1982
    i am a newbie . i have a question regarding struts 2 framework and tomcat . i know that each request has it own thread , but my question is are the global variables defined in struts action shared amongst requests. for ex: if i have a global variable named say int pageNo; and i am using in say method called paginationAll() can i use the same variable (pageNo) for another method called say paginatonMaterialAll() in the same action or does each thread has its own set of variables even though globally defined?

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  • How to find selected node in Tree?

    - by badgirl
    Hello. I have dynamic tree (moreover nodes can have children). Every node has some action. When I right click on some node, it offers me some actions. One action, for example createChildNode creates child node, which in turn creates MyObject2. MyObject2 must be created with assistance of MyOject1, which was created in parent node(that one where I right click for actions ). How to get that object from selected node? That objects in nodes are putted to lookups.singleton(MyObjectX)

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  • Why is my SAX handler returning an object with no values? I am setting it just fine

    - by Blankman
    I'm writing a SAX parser for an xml, and the object it returns doesn't have the values that I am setting in the events. My classes structure is like this: public class ProductSAXHandler extends DefaultHandler { private Product product; public ProductSAXHandler() { product = new Product(); } public Product ParseXmlFile(String xml) { SAXParserFactory spf = new ... XMLReader parser = .... parser.parse(xml); return product; } public void StartElement(....) { for(int ...) { // looping through attributes if(qName == "description" && name == "sku") { product.setSKU(value); } } } } When I am in debug mode, the value of product does get set, and I can see that the product's sku field has the correct value. But for some reason the product object returned is just a new Product object with no values set during the parsing. What am I doing wrong here? It must be me not understanding how these events are fired etc.

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  • Include multiple jars with classpathentry

    - by ripper234
    I have an eclipse's .classpath file that looks like this: <?xml version="1.0" encoding="UTF-8"?> <classpath> <classpathentry kind="src" path="src"/> <classpathentry kind="src" path="test"/> <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/> <classpathentry kind="output" path="bin"/> <classpathentry kind="lib" path="/libraries/jee/servlet-api.jar"/> <classpathentry kind="lib" path="/libraries/junit/junit-4.6.jar"/> <classpathentry kind="lib" path="/libraries/log4j/log4j-1.2.15.jar"/> </classpath> I'd like to add a whole directory of jars to the classpath - I like eclipse (or more precisely, our ant-based build process that uses .classpath format) to know several jars that reside in a single directory, without specifying them directly. How can I do that?

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  • Why does the compiler complain "while expected" when I try to add more code?

    - by user1893578
    Write a program with a word containing @ character as an input. If the word doesn't contain @, it should prompt the user for a word with @. Once a word with @ is read, it should output the word then terminate. This is what I have done so far: public class find { public static void main(String[] args) { System.out.println(" Please enter a word with @ "); Scanner scan = new Scanner(System.in); String bad = "@"; String word = scan.next(); do if (!word.contains(bad)) System.out.println(" Please try again "); else System.out.println(" " + word); while (!word.contains(bad)); } } I can get it to terminate after a word containing "@" is given as input, but if I try to add a Scanner to the line after "please try again", it says while expected.

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  • Need help setting up a truststore's chain of authority (in Tomcat)

    - by codeinfo
    Lead in ... I'm not an expert, by far, in application security via SSL, but am trying to establish a test environment that includes all possible scenarios we may encounter in production. For this I have a tree of Certificate Authorities (CAs) that are the issuers of an assortment of test client certificates, and node/server certificates (complex test environment representing the various published web services and other applications we integrate with). The structure of these CAs are as follows: Root CA, which has signed/issued Sub CA1, Sub CA2, and Sub CA3. These subs have then signed/issued all certificates of those various nodes and clients in the environment. Now for the question .... In my application's truststore I would like to trust everything signed by Sub CA1, and Sub CA2, but not Sub CA3 (untrusted). Does this mean my truststore should (1) ONLY include Sub CA1 and Sub CA2, or (2) should it include Root CA, Sub CA1, and Sub CA2? I don't know what is the proper way to represent this trust chain in a truststore. In the future I would also like to add a Sub CA4 (also signed/issued by the Root CA), but add that to a Certificate Revocation List (CRL) for testing purposes. Ahead of time, thank you for any help concerning this. It's greatly appreciated.

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  • J2ME polish problems when running on the phones

    - by Reza Hasht
    I built an application with j2me polish,it works well on emulator but after installing on phones, I have some basic problems: At first why the size of application is big(in my case 1.5 mb),is there any way to decrease polish apps size(my resources are just 300 kb). For installing it on the phone, I copy the jar file from dist folder; Is my way correct? Important!:arabic words in some SonyEricsson phones are seprated and reversed, I searched the web, but I just found some topics about LWUIT and I coulden't solve it on polish!

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  • Is it standard behavior for this code to throw a NullPointerException?

    - by Eric
    I've had a big problem in some library code, which I've pinned down to a single statement: System.out.println((String) null); Ok, the code doesn't actually look like that, but it certainly calls println with a null argument. Doing this causes my whole applicaio to throw an unexpected NullPointerException. In general, should println throw this exception under that circumstance, or is this non-standard behavior due to a poor implementation of the out instance?

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  • Struts html:checkbox query

    - by sarah
    Hi All, i have the following code . <td> <html:checkbox name="userForm" property="isActive" /></td> and in Form is have property called isActive of type char ,how would i get the checked value of it ,i am getting some symbols like 'o' if checked. I am using userform.getIsActive() ,where i am going wrong .I want 'y' or 'n' values

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  • How is this function being made use of?

    - by Kay
    Hello all, I am just studying a few classes given to me by my lecturer and I can't understand how the function heapRebuild is being made used of! It doesn't change any global variables and it doesn't print out anything ad it doesn't return anything - so should this even work? It shouldn't, should it? If you were told to make use of heapRebuild to make a new function removeMac would you edit heapRebuild? public class MaxHeap<T extends Comparable<T>> implements Heap<T>{ private T[] heap; private int lastIndex; public T removeMax(){ T rootItem = heap[0]; heap[0] = heap[lastIndex-1]; lastIndex--; heapRebuild(heap, 0, lastIndex); return rootItem; } protected void heapRebuild(T[ ] items, int root, int size){ int child = 2*root+1; if( child < size){ int rightChild = child+1; if ((rightChild < size) && (items[rightChild].compareTo(items[child]) > 0)){ child = rightChild; } if (items[root].compareTo(items[child]) < 0){ T temp = items[root]; items[root] = items[child]; items[child] = temp; heapRebuild(items, child, size);} } } }

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  • custom implementation of interface methods

    - by Renuka
    Hello all, I have a doubt in this scenario, I have posted some example code here.... public interface a{ public void m1(); public void m2(); public void m3(); . . . public void m100(); } public class A implements a{ public void m3(){ // implementation code } // Here i need to implement only m3() method but not all 100 methods //basically i have to implement all the other 99 methods // but here i don't want to either implement or provide skeleton declarations for all //remaining.... what should i do for compiling this ???? } Could anyone help this?

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  • hibernate pagination mechanism

    - by haicnpmk44
    I am trying to use Hibernate pagination for my query (PostgreSQL ) i set setFirstResult(0), setMaxResults(20) for my sql query. My code like below: Session session = getSessionFactory().getCurrentSession(); session.beginTransaction(); Query query = session.createQuery("select id , customer_name , address from tbl_customers "); query.setFirstResult(0); query.setMaxResults(20); List<T> entities = query.list(); session.getTransaction().commit(); but when viewing SQL hibernate log, i still see full sql query: Hibernate: select customer0_.id as id9_, customer0_.customer_name as dst2_9_, customer0_.addres as dst3_9_ from tbl_customers customer0_ Why there is no LIMIT OFFSET in query of Hibernate pagination SQL log? Does anyone know about Hibernate pagination mechanism? I guess that Hibernate will select all data, put data into Resultset, and then paging in Resultset, right?

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  • What's an effective way to reuse ArrayLists in a for loop?

    - by Patrick
    hi, I'm reusing the same ArrayList in a for loop, and I use for loop results = new ArrayList<Integer>(); experts = new ArrayList<Integer>(); output = new ArrayList<String>(); .... to create new ones. I guess this is wrong, because I'm allocating new memory. Is this correct ? If yes, how can I empty them ? Added: another example I'm creating new variables each time I call this method. Is this good practice ? I mean to create new precision, relevantFound.. etc ? Or should I declare them in my class, outside the method to not allocate more and more memory ? public static void computeMAP(ArrayList<Integer> results, ArrayList<Integer> experts) { //compute MAP double precision = 0; int relevantFound = 0; double sumprecision = 0; thanks

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