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  • How does polymorph ambiguity distinction work?

    - by Pentius
    Given I have a class with two constructors: public class TestClass { ObjectOne o1; ObjectTwo o2; public TestClass(ObjectOne o1) { // .. } public TestClass(ObjectTwo o2) { // .. } } What happens, if I call: new TestClass(null); How to determine the correct method to call? And who determines that? Are there differences between Java and other OOP languages?

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  • Splitting a file before upload?

    - by Yevgeniy Brikman
    On a webpage, is it possible to split large files into chunks before the file is uploaded to the server? For example, split a 10MB file into 1MB chunks, and upload one chunk at a time while showing a progress bar? It sounds like JavaScript doesn't have any file manipulation abilities, but what about Flash and Java applets? This would need to work in IE6+, Firefox and Chrome. Update: forgot to mention that (a) we are using Grails and (b) this needs to run over https.

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  • Does Google app engine supports JDBC?

    - by Rakesh Juyal
    I have heard the Google App Engine[java] do not support JDBC and Hibernate. Is it true? If yes then how do we access the database in Google App Engine. Also, is there any [basic] sample application which can help me understand how to perform CRUD operations in GAE.

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  • Set PdfPTable columns width iText

    - by Mr CooL
    I've a PdfPTable created in my Java program, Is there any way to actually set the width of specific column for the PdfPTable????? For instance, First column to be 5% width, second column to be 20% and etc. Urgent help please if anyone knows the way. Thanks in advance.

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  • Unexpected return value

    - by Nicholas Gibson
    Program stopped compiling at this point: What is causing this error? (Error is at the bottom of post) public class JFrameWithPanel extends JFrame implements ActionListener, ItemListener { int packageIndex; double price; double[] prices = {49.99, 39.99, 34.99, 99.99}; DecimalFormat money = new DecimalFormat("$0.00"); JLabel priceLabel = new JLabel("Total Price: "+price); JButton button = new JButton("Check Price"); JComboBox packageChoice = new JComboBox(); JPanel pane = new JPanel(); TextField text = new TextField(5); JButton accept = new JButton("Accept"); JButton decline = new JButton("Decline"); JCheckBox serviceTerms = new JCheckBox("I Agree to the Terms of Service.", false); JTextArea termsOfService = new JTextArea("This is a text area", 5, 10); public JFrameWithPanel() { super("JFrame with Panel"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); pane.add(packageChoice); setContentPane(pane); setSize(250,250); setVisible(true); packageChoice.addItem("A+ Certification"); packageChoice.addItem("Network+ Certification "); packageChoice.addItem("Security+ Certifictation"); packageChoice.addItem("CIT Full Test Package"); pane.add(button); button.addActionListener(this); pane.add(text); text.setEditable(false); text.setBackground(Color.WHITE); text.addActionListener(this); pane.add(termsOfService); termsOfService.setEditable(false); termsOfService.setBackground(Color.lightGray); pane.add(serviceTerms); serviceTerms.addItemListener(this); pane.add(accept); accept.addActionListener(this); pane.add(decline); decline.addActionListener(this); } public void actionPerformed(ActionEvent e) { packageIndex = packageChoice.getSelectedIndex(); price = prices[packageIndex]; text.setText("$"+price); Object source = e.getSource(); if(source == accept) { if(serviceTerms.isSelected() = false) // line 79 { JOptionPane.showMessageDialog(null,"Please accept the terms of service."); } else { JOptionPane.showMessageDialog(null,"Thanks."); } } } Error: \Desktop\Java Programming\JFrameWithPanel.java:79: unexpected type required: variable found : value if(serviceTerms.isSelected() = false) ^ 1 error

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  • topic for final year project

    - by Mrinal Shrivastava
    i am a computer science student and have just entered in my final year. i wanna do a project on something new and exciting in the field of networking dbms os or ai. i am proficient in java c, oracle and am improving my linux skills.. please give me some suggestions for hot topics..

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  • Best way to package a class for use in another app?

    - by Brad Hein
    I've written an Android app wich various abstract classes that perform useful functions. These functions could be leveraged in other apps. I want to share a class module with another programmer, but I don't want to share the source code. I would like to share a .class file but I'm not sure how to do the following: Compile an Android .java file into .class What does the receiver of the .class file have to do to use that .class in their project? (using Eclipse environment) Thank you very much

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  • Build a road network out of shapefile coordinates

    - by Sameer
    I want to build a road network from the ESRI shapefiles. I am able to read the data from the .shp files but unable to proceed any further with building the road network out of the shapefile coordinates and display it on the screen. I am not that expirienced in Java. I would appreciate any kind of suggestions on how should i proceed now.

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  • Wicket @SpringBean doesn't create serializable proxy

    - by vinga
    @SpringBean PDLocalizerLogic loc; When using above I receive java.io.NotSerializableException. This is because loc is not serializable, but this shouldn't be problem because spring beans are a serializable proxies. On the page https://cwiki.apache.org/WICKET/spring.html#Spring-AnnotationbasedApproach is written: Using annotation-based approach, you should not worry about serialization/deserialization of the injected dependencies as this is handled automatically, the dependencies are represented by serializable proxies What am I doing wrong?

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  • importing project in Eclipse

    - by Zachary
    Hello I am new to Eclipse (and I am a novice in Java): I am creating a project which should make use of some classes from another project. Do I have to export necessarily this last project as JAR file and add in my project? Are there other alternatives?

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  • can i know how to fix this error? is delete method

    - by user334101
    import javax.swing.*; import java.io.File; public class Third { public static void main(String[] args) throws Exception { String humanName; humanName = JOptionPane.showInputDialog(null, "Enter the file name"); File file = new File(+ humanName".txt"); System.out.println(file.delete()); JOptionPane.showMessageDialog(null, "File deleted" + humanName); } }

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  • summer training

    - by rohit-garg
    hi i wanna make a retail store software for my family retail store .... can anyone help me out with which language to use and just give me some basic ideas I'm an engineering student and have good knowledge of ASP, HTML, CSS, VBSCRIPT and have gone through java , c ,c++. please help me anyone

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  • Create a dataset: extract features from text documents (TF-IDF)

    - by BigG
    I've to create a dataset from some text files, writing them as vectors of features. Something like this: doc1: 1,0.45 6,0.001 94,0.1 ... doc2: 3,0.5 98,0.2 ... ... each position of the vector represent a word, and the score is given by something like TF-IDF. Do you know some library/tool/whatever for this? (java is better)

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  • What are real world examples of when Linked Lists should be used?

    - by oo
    Another programmer was mentioning that they haven't found a use case for using a linked list data structure in any professional software in his career. I couldn't think of any good examples off the top of my head. He is mostly a C# and Java developer Can anyone give some examples where this was the correct data structure to solve a particular real world problem? Related: What is a practical, real world example of the Linked List?

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  • Google sites creation

    - by bhuvi
    Hi, I am creating a sites by java programming using google sites API developer guide. I had easily created different type of pages as parent page and sub pages also. my problem is,I am not able to create a web page as parent page and file cabinet, announcement, list page as sub page. That's parent page and sub page is created as same not as different page. please tell me a solution.

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  • Best Embedded SQL DB for write performance?

    - by max.minimus
    Has anybody done any benchmarking/evaluation of the popular open-source embedded SQL DBs for performance, particularly write performance? I've some 1:1 comparisons for sqlite, Firebird Embedded, Derby and HSQLDB (others I am missing?) but no across the board comparisons... Also, I'd be interested in the overall developer experience for any of these (for a Java app).

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  • Hibernate Initial SessionFactory creation failed

    - by user364746
    Hello.. I'm trying to use hibernate to fill my jsf selectonemenu in ApplicationBean (in Liferay). The problem is that I got Initial SessionFactory creation failed problem. Before putting my functions in the applicationbean I was setting them in sessionbean and I got no error. For now the full error Initial SessionFactory creation failed.java.lang.ClassCastException: org.hibernate.type.StringType cannot be cast to org.hibernate.type.VersionType Thanks

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