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  • Convert an ArrayList to an object array

    - by marionmaiden
    Hello, Is there a command in java for conversion of an ArrayList into a object array. I know how to do this copying each object from the arrayList into the object array, but I was wondering if would it be done automatically. I want something like this: ArrayList<TypeA> a; // Let's imagine "a" was filled with TypeA objects TypeA[] array = MagicalCommand(a);

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  • Robust way to save/load objects with dependencies?

    - by mrteacup
    I'm writing an Android game in Java and I need a robust way to save and load application state quickly. The question seems to apply to most OO languages. To understand what I need to save: I'm using a Strategy pattern to control my game entities. The idea is I have a very general Entity class which e.g. stores the location of a bullet/player/enemy and I then attach a Behaviour class that tells the entity how to act: class Entiy { float x; float y; Behavior b; } abstract class Behavior { void update(Entity e); {} // Move about at a constant speed class MoveBehavior extends Behavior { float speed; void update ... } // Chase after another entity class ChaseBehavior extends Behavior { Entity target; void update ... } // Perform two behaviours in sequence class CombineBehavior extends Behavior { Behaviour a, b; void update ... } Essentially, Entity objects are easy to save but Behaviour objects can have a semi-complex graph of dependencies between other Entity objects and other Behaviour objects. I also have cases where a Behaviour object is shared between entities. I'm willing to change my design to make saving/loading state easier, but the above design works really well for structuring the game. Anyway, the options I've considered are: Use Java serialization. This is meant to be really slow in Android (I'll profile it sometime). I'm worried about robustness when changes are made between versions however. Use something like JSON or XML. I'm not sure how I would cope with storing the dependencies between objects however. Would I have to give each object a unique ID and then use these IDs on loading to link the right objects together? I thought I could e.g. change the ChaseBehaviour to store a ID to an entity, instead of a reference, that would be used to look up the Entity before performing the behaviour. I'd rather avoid having to write lots of loading/saving code myself as I find it really easy to make mistakes (e.g. forgetting to save something, reading things out in the wrong order). Can anyone give me any tips on good formats to save to or class designs that make saving state easier?

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  • Execute a default task in ANT in case of failure

    - by elos
    Hi, I'm currently using ANT for building my Java project on a Windows XP machine. In my build.xml file I've defined 3 task and I would like that,in case of fail,a default task be executed before closing the building and exiting (like a recovery procedure). I would like to know if it's possible. thanks

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  • JSplitPane SetDividerLocation Problem

    - by Goutham
    I have a JSplitPane which when shown should split the pane by 50%. Now on giving an argument of 0.5 (as suggested) to setDividerLocation, Java seems to treat it as a normal number instead of a percentage. As in, the divider, instead of going to the middle of the pane, is almost at the start of the left pane (the pane is vertically split). Any work arounds?

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  • Regex for Eclipse/Flash Builder File Search for comments?

    - by Brian Bishop
    In Eclipse (and Flash/Flex Builder) you get the option with Ctrl+Shift+F to do a file search and look for a regular expression. Would be a real handy thing to know. I want to find the word negate if it appears in a Flex/java comment like the following: // It was negated because or /* The negate option was.... */ or /** * We have to negate the value */ Any ideas? Will test them out at http://www.regexplanet.com/simple/index.html

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  • Object or primitive type

    - by John
    Hi, Can someone explain to me the usage of Integer, Boolean etc in place of their primitive types in JAVA? I can't seem to grasp the advantages their are providing. They seem to create unnecessary problems of handling null values. Thanks!

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  • Lightest Database to be packed with an application

    - by Yatendra Goel
    I am developing a Java Desktop Application and want a light database that can be used with Hibernate and that can be packed with an application. I was going to use Derby database. It's size is near 2 MB. But before that I wanted to have views of experts on SO. Will it work with Hibernate? Actually, I am new to Hibernate and was studying that it requires a Dialect for a database so Is Hibernate has dialect for Derby?

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  • How to find out or where to specify path of the JavaEE project?

    - by Milan
    I develop Java EEapplication and I have to create some files in the src folder in the my application. But I dont where or how to specify the path. I want my application to be portable. It means just to say TestProject/src/.... and not C:/bla/bla/TestProject/src/... do we specify this in some app file like web.inf, meta-inf or its just some trick. Thanks!

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  • How do I get all the calendar entries for a particular time range using Google Calendar API

    - by BeWarned
    I want to view events over specific time range for a specific calendar, but am having trouble using the API, It is a generic API, and it reminds me of using the DOM. The problem is that it seems difficult to work with because much of the information is in generic base classes. How do I get the events for a calendar using Groovy or Java? Does anybody have an example of passing credentials using curl? Example code would be appreciated.

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  • net.sf.json.JSONObject adds backslashes where it's not expected ?

    - by cx42net
    Hi there, I'm loosing my hair trying to figure out why net.sf.json.JSONObject add extra backslash where it shouldn't on my java code : JSONObject obj = new JSONObject (); obj.element ("column_name", "<a href=\"#\" title=\"test\">Test !</a>"); will output : <a href=\"#\" title=\"test\">Test !<\/a> with an extra "\" near <\/a. How can I avoid this behavior ? Thanks for your help !

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  • Please help with choosing CI build tool

    - by alexeypro
    Hello, I need to choose the right CI build tool which will: 1. Support groups of build configurations so we can use the standardized build process for all our projects 2. Support dashboard with "pretty" (for executive/director "eye" :-) reports. 3. Support Java, Maven, Ant, and be somewhat customizable for build process itself (though this is optional, as I can "fix" it with scripts) I'd prefer free and open source tool, but paid version is fine too. Please help :-)

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  • swing syntax highlighter

    - by Simon
    Hi, I need some advice on creating a syntax highligher for java application using swing. The application should allow to edit a file and highlight syntax. I don't know the swing library, what should I look for?

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  • caching the form values

    - by ha22109
    Hello , I have a search form.When user post the search form i take the user to the result page which has search form and results of the search.Now if the user click on the back button of the browser ,i want that he should be the search page form filled with his values.I am using java

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  • Multiple choice test GUI with serialization of Q&A

    - by Bobby
    I'm working on a project for school in Java programming. I need to design a GUI that will take in questions and answers and store them in a file. It should be able to contain an unlimited number of questions. We have covered binary I/O. How do I write the input they give to a file? How would I go about having them add multiple questions from this GUI? package multiplechoice; import java.awt.*; import javax.swing.*; public class MultipleChoice extends JFrame { public MultipleChoice() { /* * Setting Layout */ setLayout(new GridLayout(10,10)); /* * First Question */ add(new JLabel("What is the category of the question?: ")); JTextField category = new JTextField(); add(category); add(new JLabel("Please enter the question you wish to ask: ")); JTextField question = new JTextField(); add(question); add(new JLabel("Please enter the correct answer: ")); JTextField correctAnswer = new JTextField(); add(correctAnswer); add(new JLabel("Please enter a reccomended answer to display: ")); JTextField reccomendedAnswer = new JTextField(); add(reccomendedAnswer); add(new JLabel("Please enter a choice for multiple choice option " + "A")); JTextField A = new JTextField(); add(A); add(new JLabel("Please enter a choice for multiple choice option " + "B")); JTextField B = new JTextField(); add(B); add(new JLabel("Please enter a choice for multiple choice option " + "C")); JTextField C = new JTextField(); add(C); add(new JLabel("Please enter a choice for multiple choice option " + "D")); JTextField D = new JTextField(); add(D); add(new JButton("Compile Questions")); add(new JButton("Next Question")); } public static void main(String[] args) { /* * Creating JFrame to contain questions */ FinalProject frame = new FinalProject(); // FileOutputStream output = new FileOutputStream("Questions.dat"); JPanel panel = new JPanel(); // button.setLayout(); // frame.add(panel); panel.setSize(100,100); // button.setPreferredSize(new Dimension(100,100)); frame.setTitle("FinalProject"); frame.setSize(600, 400); frame.setLocationRelativeTo(null); // Center the frame frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }

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  • Prevent drop down list options scrolling on Windows in SWT

    - by parxier
    One of the drop down lists in my Java SWT application has 8 fixed options. When I click on it only 5 first options are visible and I have to scroll the list down to view the rest. Is there any way to force it to make all options visible without having to scroll down? There is another similar .NET application that has same drop down list with the same options and they all are visible without having to scroll down!

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  • How to create a database binding using Windows Builder Pro?

    - by Tiago
    For the first time, I'm creating a Java Swing application. I'm using Windows Builder Pro in Eclipse, and a MySQL database (already setup up). Let's say I have a combo box, and I want (for instance) all 'name' fields from a 'certain' table appear. How can I setup that binding? I know how to programatically handle the connection and query code, what I would like to know is how to make that binding in Eclipse.

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  • Blackberry - "[projectname].debug file is missing" and "I/O Error: Cannot find program "jar"

    - by TreeUK
    I'm running eclipse with the Blackberry Java Plug-in, working on a 1.4.5 Blackberry project. The project has been building and debugging in the emulator normally until I started getting: A prompt saying "[projectname].debug file is missing". A message in the Blackberry Packaging Console saying "I/O Error: Cannot find program "jar": CreateProcess error=2." Anyone have any ideas what could be causing this?

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