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  • Java : Sorting unsorted array in descending order

    - by Bader
    hi guys i had an array of objects , i need to know how should i sort my unsorted array in descending order according to the highest value inside objects i need this using for loops not the easy way. i had done this but it seems there is a problem code student[] temp=new student[s.length]; for (int i=0;i s[i + 1].GetGpa()) { temp[i] = s[i]; } } how should i do it using for loops

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  • Java Swing Table questions

    - by Dalton Conley
    Hey guys, working on an event calendar. I'm having some trouble getting my column heads to display.. here is the code private JTable calendarTable; private DefaultTableModel calendarTableModel; final private String [] days = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}; ////////////////////////////////////////////////////////////////////// /* Setup the actual calendar table */ calendarTableModel = new DefaultTableModel() { public boolean isCellEditable(int row, int col){ return false; } }; // setup columns for(int i = 0; i < 7; i++) calendarTableModel.addColumn(days[i]); calendarTable = new JTable(calendarTableModel); calendarTable.getTableHeader().setResizingAllowed(false); calendarTable.getTableHeader().setReorderingAllowed(false); calendarTable.setColumnSelectionAllowed(true); calendarTable.setRowSelectionAllowed(true); calendarTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); calendarTable.setRowHeight(105); calendarTableModel.setColumnCount(7); calendarTableModel.setRowCount(6); Also, Im sort of new with tables.. how can I make the rowHeight split between the max size of the table?

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  • Why Java SimpleDateFormat().parse() is giving weird formate?

    - by MAK
    My input is String formated as the following: 3/4/2010 10:40:01 AM 3/4/2010 10:38:31 AM My code is: DateFormat dateFormat = new SimpleDateFormat("dd/mm/yyyy hh:mm:ss aa"); try { Date today = dateFormat.parse(time); System.out.println("Date Time : " + today); } catch (ParseException e) { e.printStackTrace(); } the output is: Sun Jan 03 10:38:31 AST 2010 Sun Jan 03 10:40:01 AST 2010 I'm not sure from where the day (Sun) came from? or (AST)? and why the date is wrong? I just wanted to keep the same format of the original String date and make it into a Date object. I'm using Netbeans 6.8 Mac version.

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  • convert password encryption from java to php

    - by Obay
    I'm trying to create a PHP version of an existing JSP program, however I'm stuck at the password encryption part. Could you please tell me how to convert this one? I know it tries to get the md5() but after that, I don't get it. I get lost in the Stringbuffer and for() parts. Can you help me out? public static String encryptPassword( String password ) { String encrypted = ""; try { MessageDigest digest = MessageDigest.getInstance( "MD5" ); byte[] passwordBytes = password.getBytes( ); digest.reset( ); digest.update( passwordBytes ); byte[] message = digest.digest( ); StringBuffer hexString = new StringBuffer(); for ( int i=0; i < message.length; i++) { hexString.append( Integer.toHexString( 0xFF & message[ i ] ) ); } encrypted = hexString.toString(); } catch( Exception e ) { } return encrypted; }

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  • Java: matching two different type of array

    - by sling
    Hi, I am doing a password login that requires me to match two array: User and Pass. If user key in "mark" and "pass", it should show successfully. However I have trouble with the String[] input = pass.getPassword(); and the matching of the two arrays. String[] User = {"mark", "susan", "bobo"}; String[] Pass = {"pass", "word", "password"}; String[] input = pass.getPassword(); if(Pass.length == input.length && user.getText().equals(User)) { lblstat.setForeground(Color.GREEN); lblstat.setText("Successful"); } else { lblstat.setForeground(Color.RED); lblstat.setText("Failed"); }

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  • Java - Collections.binarySearch with PriorityQueue?

    - by msr
    Hello, Can I use Collections.binarySearch() method to search elements in a PriorityQueue? Otherwise, how can I apply search algorithms to a PriorityQueue? I have this (class Evento implements Comparable): public class PriorityQueueCAP extends PriorityQueue<Evento>{ // (...) public void removeEventos(Evento evento){ Collections.binarySearch(this, evento); // ERROR! } } And I got this error: "The method binarySearch(List, T) in the type Collections is not applicable for the arguments (PriorityQueueCAP, Evento)" Why? Thanks in advance!

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  • Java: minimum number of operations for conjunctive inequalities?

    - by HH
    I try to simplify conditionals in for (int t=0,size=fo.getPrintViewsPerFile().size();t<size&&t<countPerFile;t++){, more precisely: t<s&&t<c You need to compare two times, then calc the boolean value from them. Is there any simpler way to do it? If no, how can you prove it? I can simplify it to some extent, proof tree.

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  • Help with hash tables and quadratic probing in Java

    - by user313458
    I really need help with inserting into a hash table. I'm just not totally getting it right now. Could someone explain quadratic and linear probing in layman's terms? public void insert(String key) { int homeLocation = 0; int location = 0; int count = 0; if (find(key).getLocation() == -1) // make sure key is not already in the table { //****** ADD YOUR CODE HERE FOR QUADRATIC PROBING ******** } } This is the code I'm working on. I'm not asking anyone to do it, I just really need help with learning the whole concept Any help would be greatly appreciated.

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  • creating executable jar file for my java application

    - by Manu
    public class createExcel { public void write() throws IOException, WriteException { WorkbookSettings wbSettings = new WorkbookSettings(); wbSettings.setLocale(new Locale("en", "EN")); WritableWorkbook workbook1 =Workbook.createWorkbook(new File(file), wbSettings); workbook1.createSheet("Niru ", 0); WritableSheet excelSheet = workbook1.getSheet(0); createLabel(excelSheet); createContent(excelSheet,list); workbook1.write(); workbook1.close(); } public void createLabel(WritableSheet sheet)throws WriteException { WritableFont times10pt = new WritableFont(WritableFont.createFont("D:\font\trebuct"),8); // Define the cell format times = new WritableCellFormat(times10pt); // Lets automatically wrap the cells times.setWrap(false); WritableFont times10ptBoldUnderline = new WritableFont( WritableFont.createFont("D:\font\trebuct"), 9, WritableFont.BOLD, false, UnderlineStyle.NO_UNDERLINE); timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderline); sheet.setColumnView(0,15); sheet.setColumnView(1,13); // Write a few headers addCaption(sheet, 0, 0, "Business Date"); addCaption(sheet, 1, 0, "Dealer ID"); } private void createContent(WritableSheet sheet, ArrayList list) throws WriteException,RowsExceededException { // Write a few number for (int i = 1; i < 11; i++) { for(int j=0;j<11;j++){ // First column addNumber(sheet, i, j,1); // Second column addNumber(sheet, 1, i, i * i); } } } private void addCaption(WritableSheet sheet, int column, int row, String s) throws RowsExceededException, WriteException { Label label; label = new Label(column, row, s, timesBoldUnderline); sheet.addCell(label); } private void addNumber(WritableSheet sheet, int row,int column, Integer integer) throws WriteException, RowsExceededException { Number number; number = new Number(column,row, integer, times); sheet.addCell(number); } public static void main(String[] args) { JButton myButton0 = new JButton("Advice_Report"); JButton myButton1 = new JButton("Position_Report"); JPanel bottomPanel = new JPanel(); bottomPanel.add(myButton0); bottomPanel.add(myButton1); myButton0.addActionListener(this); myButton1.addActionListener(this); createExcel obj=new createExcel(); obj.setOutputFile("c;\\temp\\swings\\jack.xls"); try{ obj.write(); }catch(Exception e){} } and so on. it working fine. i have jxl.jar and ojdbc14.jar files(need this jar file for Excelsheet creation and DB connection )and createExcel.class(.class file) file. how to make this code as executable jar file.

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  • Java - Problem in JTree

    - by Yatendra Goel
    There are 2 JTree: JTree1 and JTree2. Note that the nodes (country, city, colors, blue ...) all will be implemented as JCheckboxes so that user can select particular colors for each city or for the whole country by selecting their corresponding checkboxes. Problems: Q1. I want that each country or city can have its own colors selected. Means if a user wants city1.1 to have colors blue and violet and city2.1 to have colors red, then he first have to select the city1.1 checkbox and then select blue and violet, and after that when he selects city2.1, then the checkboxes blue and violet are deselected automatically so that user can select the colors for city2.1. But when the user selects the city1.1 again, then the JTree2should show the selected colors (bule and violet) for city1.1. So for this purpose, Is the JTree (with its nodes as checkboxes) correct option to implement or I should use some other JComponent? If JTree is a correct option, then how can I remember the colors of each city?

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  • JAVA and how to execute user-code

    - by Parhs
    Hello. I am building a tool which should do a diagnosis based on some values... It should be user extensible so hardcoding the conditions isnt a solution... Suppose that we have a blood test... example ... WBC , ALDO ... And i want the user to be able to write somehow scripts if (WBC.between(4,10) && ALDO.greater(5) || SOMETHINGELESE.isTrue()) ..... diagnosis="MPLAMPLA"... The problem is 1)Write my parser 2)Or try to find something that executes user conditionals at runtime and customize it.. 3)another way Please help,ideas needed!

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  • How does one convert from a Java resultset to ColdFusion query in Railo?

    - by Shawn Grigson
    The following works fine in CFMX 7 and CF8, and I'd assume CF9 as well: <!--- 'conn' is a JDBC connection ---> <cfset stat = conn.createStatement() /> <cfset rs = stat.executeQuery(trim(arguments.sql)) /> <!--- convert this Java resultset to a CF query recordset ---> <cfset queryTable = CreateObject("java", "coldfusion.sql.QueryTable")> <cfset queryTable.init(rs) > <cfset query = queryTable.FirstTable() /> This creates a statement using a JDBC driver, executes a query against it, putting it into a java resultset, and then coldfusion.sql.QueryTable is instantiated, passed the Java resulset object, and then queryTable.FirstTable() is called, which returns an actual coldfusion resultset (for cfloop and the like). The problem comes with a difference in Railo's implementation. Running this code in Railo returns the following error: No matching Constructor for coldfusion.sql.QueryTable(org.sqlite.RS) found. I've dumped the Railo java object, and don't see init() among the methods. Am I missing something simple? I'd love to get this working in Railo as well. Please note: I am doing a DSN-less connection to a SQLite db. I understand how to set up a CF datasource. My only hiccup at this point is doing the translation from a Java result set to a Railo query.

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  • Java: define terms initialization, declaration and assignment

    - by HH
    I find the defs circular statements, the subjects are defined by their verbs but the verbs are undefined! So how do you define them? The question is central to understand the term final, related. The Circular Definitions itialization: to initilise a variable. It can be can be done at the time of declaration. assignment: to assign value to a variable. It can be done anywhere. declaration: to declare value to a variable.

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  • Some more multitasking java issues

    - by owca
    I had a task to write simple game simulating two players picking up 1-3 matches one after another until the pile is gone. I managed to do it for computer choosing random value of matches but now I'd like to go further and allow humans to play the game. Here's what I already have : http://paste.pocoo.org/show/200660/ Class Player is a computer player, and PlayerMan should be human being. Problem is, that thread of PlayerMan should wait until proper value of matches is given but I cannot make it work this way. When I type the values it sometimes catches them and decrease amount of matches but that's not exactly what I was up to :) Logics is : I check the value of current player. If it corresponds to this of the thread currently active I use scanner to catch the amount of matches. Else I wait one second (I know it's kinda harsh solution, but I have no other idea how to do it). Class Shared keeps the value of current player, and also amount of matches. By the way, is there any way I can make Player and Shared attributes private instead of public and still make the code work ? CONSOLE and INPUT-DIALOG is just for choosing way of inserting values. class PlayerMan extends Player{ static final int CONSOLE=0; static final int INPUT_DIALOG=1; private int input; public PlayerMan(String name, Shared data, int c){ super(name, data); input = c; } @Override public void run(){ Scanner scanner = new Scanner(System.in); int n = 0; System.out.println("Matches on table: "+data.matchesAmount); System.out.println("which: "+data.which); System.out.println("number: "+number); while(data.matchesAmount != 0){ if(number == data.which){ System.out.println("Choose amount of matches (from 1 to 3): "); n = scanner.nextInt(); if(data.matchesAmount == 1){ System.out.println("There's only 1 match left !"); while(n != 1){ n = scanner.nextInt(); } } else{ do{ n = scanner.nextInt(); } while(n <= 1 && n >= 3); } data.matchesAmount = data.matchesAmount - n; System.out.println(" "+ name+" takes "+n+" matches."); if(number != 0){ data.which = 0; } else{ data.which = 1; } } else{ try { Thread.sleep(1000); } catch(InterruptedException exc) { System.out.println("End of thread."); return; } } System.out.println("Matches on table: "+data.matchesAmount); } if(data.matchesAmount == 0){ System.out.println("Winner is player: "+name); stop(); } } }

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  • Java HTTP Requests Buffer size

    - by behrk2
    Hello, I have an HTTP Request Dispatcher class that works most of the time, but I had noticed that it "stalls" when receiving larger requests. After looking into the problem, I thought that perhaps I wasn't allocating enough bytes to the buffer. Before, I was doing: byte[] buffer = new byte[10000]; After changing it to 20000, it seems to have stopped stalling: String contentType = connection.getHeaderField("Content-type"); ByteArrayOutputStream baos = new ByteArrayOutputStream(); InputStream responseData = connection.openInputStream(); byte[] buffer = new byte[20000]; int bytesRead = responseData.read(buffer); while (bytesRead > 0) { baos.write(buffer, 0, bytesRead); bytesRead = responseData.read(buffer); } baos.close(); connection.close(); Am I doing this right? Is there anyway that I can dynamically set the number of bytes for the buffer based on the size of the request? Thanks...

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  • Java Date vs Calendar

    - by Marty Pitt
    Could someone please advise the current "best practice" around Date and Calendar types. When writing new code, is it best to always favour Calendar over Date, or are there circumstances where Date is the more appropriate datatype?

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  • Java: CSV file read & write.

    - by battousai622
    Im reading in 2 csv file: store_inventory & new_acquisitions... I want to be able to compare the store_inventory csv file with new_acquisitions. 1) If the item names match just update the quantity in store_inventory. 2) If new_acquisitions has a new item that does not exist in store_inventory, then add it to the store_inventory. Heres what i have so far but its not very good. I added comments where i need to add taks 1) & 2). Any advice or code would be great, thanks. File new_acq = new File("/src/test/new_acquisitions.csv"); Scanner acq_scan = null; try { acq_scan = new Scanner(new_acq); } catch (FileNotFoundException ex) { Logger.getLogger(mainpage.class.getName()).log(Level.SEVERE, null, ex); } String itemName; int quantity; Double cost; Double price; File store_inv = new File("/src/test/store_inventory.csv"); Scanner invscan = null; try { invscan = new Scanner(store_inv); } catch (FileNotFoundException ex) { Logger.getLogger(mainpage.class.getName()).log(Level.SEVERE, null, ex); } String itemNameInv; int quantityInv; Double costInv; Double priceInv; while (acq_scan.hasNext()) { String line = acq_scan.nextLine(); if (line.charAt(0) == '#') { continue; } String[] split = line.split(","); itemName = split[0]; quantity = Integer.parseInt(split[1]); cost = Double.parseDouble(split[2]); price = Double.parseDouble(split[3]); while(invscan.hasNext()) { String line2 = invscan.nextLine(); if (line2.charAt(0) == '#') { continue; } String[] split2 = line2.split(","); itemNameInv = split2[0]; quantityInv = Integer.parseInt(split2[1]); costInv = Double.parseDouble(split2[2]); priceInv = Double.parseDouble(split2[3]); if(itemName == itemNameInv) { //update quantity } } //add new entry into csv file } Thanks again for any help. =]

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