What's with this code?

if(message.startsWith("!setevent ")){
String event;
event = String.format(message.substring(10));
sendMessage(channel, "Event set to: "+ event +"!");
if(message.startsWith("!event")){
sendMessage(sender, event);
It is for an IRC bot, and i am UBERCONFUSED!

Yes but my IF statement must have that variable in
there because if someone types "!setevent today we
will have a picnic" and someone types "!event"they
would get what the orignial !seteventer did. But ifI
declare it somewhere else it will always stay the
same until I close it, change it, compile it, andrun
it, which is a huge hassle.I have no idea what you're talking about. Try this:
String event;
if(message.startsWith("!setevent ")){
event = String.format(message.substring(10));
sendMessage(channel, "Event set to: "+ event +"!");
if(message.startsWith("!event")){
sendMessage(sender, event);
when I do that it says "Variable event may not have been initialized." HELP!

Similar Messages

  • Contest: Guess whats wrong with this code!

    Can you guess whats wrong with this code snippet? Perhaps its too easy...
    private void clearDefaultTableModel( DefaultTableModel dtm) {    
            int  rowCount  = dtm.getRowCount();
            for(int i =0;  i < rowCount; i++) {
                dtm.removeRow(i);  
        }- Karl XII

    Can you guess whats wrong with this code snippet?
    Perhaps its too easy...
    private void clearDefaultTableModel(
    DefaultTableModel dtm) {    
    int  rowCount  = dtm.getRowCount();
    for(int i =0;  i < rowCount; i++) {
    dtm.removeRow(i);  
    it should be
    private void clearDefaultTableModel(DefaultTableModel dtm) {    
       int  rowCount  = dtm.getRowCount();
       for(int i =0;  i < rowCount; i++) {
         dtm.removeRow(0);  
    }or another way
    private void clearDefaultTableModel(DefaultTableModel dtm) {    
      while(dtm.getRowCount()>0){
         dtm.removeRow(0);  

  • HELP PLEASE - WHATS WRONG WITH THIS CODE

    Hi. I get this message coming up when I try to compile the code,
    run:
    java.lang.NullPointerException
    at sumcalculator.SumNumbers.<init>(SumNumbers.java:34)
    at sumcalculator.SumNumbers.main(SumNumbers.java:93)
    Exception in thread "main"
    Java Result: 1
    BUILD SUCCESSFUL (total time: 2 seconds)
    I am not sure whats wrong with the code. Any assistance would be nice. The code is below.
    package sumcalculator;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.*;
    public class SumNumbers extends JFrame implements FocusListener {
    JTextField value1;
    JTextField value2;
    JLabel equals;
    JTextField sum;
    JButton add;
    JButton minus;
    JButton divide;
    JButton multiply;
    JLabel operation;
    public SumNumbers() {
    SumNumbersLayout customLayout = new SumNumbersLayout();
    getContentPane().setFont(new Font("Helvetica", Font.PLAIN, 12));
    getContentPane().setLayout(customLayout);
    value1.addFocusListener(this);
    value2.addFocusListener(this);
    sum.setEditable(true);
    value1 = new JTextField("");
    getContentPane().add(value1);
    value2 = new JTextField("");
    getContentPane().add(value2);
    equals = new JLabel("label_1");
    getContentPane().add(equals);
    sum = new JTextField("");
    getContentPane().add(sum);
    add = new JButton("+");
    getContentPane().add(add);
    minus = new JButton("-");
    getContentPane().add(minus);
    divide = new JButton("/");
    getContentPane().add(divide);
    multiply = new JButton("*");
    getContentPane().add(multiply);
    operation = new JLabel();
    getContentPane().add(operation);
    setSize(getPreferredSize());
    addWindowListener(new WindowAdapter() {
    public void windowClosing(WindowEvent e) {
    System.exit(0);
    public void focusGained(FocusEvent event){
    try {
    float total = Float.parseFloat(value1.getText()) +
    Float.parseFloat(value2.getText());
    sum.setText("" + total);
    } catch (NumberFormatException nfe) {
    value1.setText("0");
    value2.setText("0");
    sum.setText("0");
    public void focusLost(FocusEvent event){
    focusGained(event);
    public static void main(String args[]) {
    SumNumbers window = new SumNumbers();
    window.setTitle("SumNumbers");
    window.pack();
    window.show();
    class SumNumbersLayout implements LayoutManager {
    public SumNumbersLayout() {
    public void addLayoutComponent(String name, Component comp) {
    public void removeLayoutComponent(Component comp) {
    public Dimension preferredLayoutSize(Container parent) {
    Dimension dim = new Dimension(0, 0);
    Insets insets = parent.getInsets();
    dim.width = 711 + insets.left + insets.right;
    dim.height = 240 + insets.top + insets.bottom;
    return dim;
    public Dimension minimumLayoutSize(Container parent) {
    Dimension dim = new Dimension(0, 0);
    return dim;
    public void layoutContainer(Container parent) {
    Insets insets = parent.getInsets();
    Component c;
    c = parent.getComponent(0);
    if (c.isVisible()) {c.setBounds(insets.left+24,insets.top+48,128,40);}
    c = parent.getComponent(1);
    if (c.isVisible()) {c.setBounds(insets.left+256,insets.top+48,128,40);}
    c = parent.getComponent(2);
    if (c.isVisible()) {c.setBounds(insets.left+408,insets.top+48,56,40);}
    c = parent.getComponent(3);
    if (c.isVisible()) {c.setBounds(insets.left+488,insets.top+48,152,40);}
    c = parent.getComponent(4);
    if (c.isVisible()) {c.setBounds(insets.left+128,insets.top+136,72,40);}
    c = parent.getComponent(5);
    if (c.isVisible()) {c.setBounds(insets.left+248,insets.top+136,72,40);}
    c = parent.getComponent(6);
    if (c.isVisible()) {c.setBounds(insets.left+368,insets.top+136,72,40);}
    c = parent.getComponent(7);
    if (c.isVisible()) {c.setBounds(insets.left+488,insets.top+136,72,40);}
    c = parent.getComponent(8);
    if (c.isVisible()) {c.setBounds(insets.left+176,insets.top+48,56,40);}
    }

    Thank you. How do i amend this? I have defined value1though.Yes, you did - but after the call to addFocusListener(...). It needs to be before it.
    BTW, you did the same thing with "value2.addFocusListener(this)" and "sum.setEditable(true)" on the next two lines. You're attempting to call a method on an object that doesn't exist yet (i.e., you haven't called new yet).

  • Fed up! dont know whats wrong with this code

    import java.io.*;
    import java.net.*;
    import java.awt.*;
    public class machine {
         private String machine_name;
         private String IP_address;
         public static void main(String[] args) throws IOException {
                   machine server = new machine();
                   server.machine_name = "SERVER1";
                   server.IP_address   = "192.168.0.1";
                   InputStreamReader reads_incoming = null;
                   // Reads incoming Bytes
                   PrintWriter sends_outgoing = null;
                   Socket ping_socket         = null;
                   try{
                        ping_socket = new Socket(server.machine_name , 7);
                        sends_outgoing = new PrintWriter(ping_socket.getOutputStream(),true);
                        reads_incoming = new InputStreamReader(ping_socket.getInputStream());
                   catch (UnknownHostException e){
                        //report error to sole text box
                   catch (IOException e)
                        //similar
                   /* Need a string to send some arbitrary bytes to SERVER1
                    * using IP_address instead , as this field in this implementation
                   while(true)
                        sends_outgoing.println(server.IP_address);
                        if(ping_socket.getInputStream() != null)
                             System.out.print("Server is up");
    }

    same... i am not very experienced, and try and uses this as training... but as new to java programming i could still mention about 5 things that might be wrong with this code... so a deeper explanation would be nice...
    while(true) { } for example seems like a nice way to make infinite loop that can suck your memory out of your computer pretty fast :-) newb

  • Whats Wrong with this code? URLReader

    Ok, so I have this URLReader.java program. It goes to a specific website, I put in a project ID. It pulls up a project. I can then "Scrape", "Extract Data from the URL and put them into variables. I then upload the variables into the DB.
    I've used this code over and over again and it works, but I seem to have a problem with the second part of the code.The error message that I get is:
    Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 1
    Please note the URL is a fake one. I did not want to give the real URL. I have provided the String to read, which is actually HTML code. I thought it might be the "Researchers(s):" string that it does like, maybe a problem with "(s), but I dont know?
    First part of the code: This really gets a project ID from a collection and iterates throught the collection with each project ID.
    String projectId = "87023";
                java.net.URL projectDetails = new  java.net.URL("http://someSite.com/portfolio/ProjectDetails.asp?Source=Tracking&Key="+projectId);
                java.io.BufferedReader in =
                            new java.io.BufferedReader(new java.io.InputStreamReader(projectDetails.openStream()));
                String projDetailspage = new String("");
                String inputLine = "";
                while ((inputLine = in.readLine()) != null)
                    projDetailspage = projDetailspage.concat(inputLine.trim());
                System.out.println("project ID: "+ projectId);
    Second Part of the Code:
    String str = (projDetailspage.split("\\<[Bb]\\>Researcher(s)\\</[Bb]\\>")  //  look for: <b>Researcher(s):</b> , also the part of code I am having problems with.
                [1].split( "\\<td\\>")[1].split("\\</table>")[0].trim());   //put everything into a variable call str from the <td> to the </table> tags 
                System.out.println("String before replace all: "+ str);
    The HTML code to read and search through:<!-- researchers -->
        <tr>
              <td width="30%" align="right" valign="top">
                   <font size="-1">
                   <b>Researcher(s):</b>
                   </font>
              </td>
                  <td width="70%" align="left" valign="top">
                        <font size="-1">
                        Dr. Michael E. Welge, University of Illinois at Urbana-Champaign
                        </font>
                   </td>
                   </tr>
                            <tr>
                                  <td width="30%">
                                       <font size="-1">
                                       </font>
                                  </td>
                                <td width="70%" align="left" valign="top">
                                       <font size="-1">
                                       Dr. Albert J. Valocchi, University of Illinois at Urbana-Champaign
                                       </font>
                                  </td>
                            </tr>
                            <tr>
                                  <td width="30%">
                                       <font size="-1">
                                       </font>
                                  </td>
                                <td width="70%" align="left" valign="top">
                                       <font size="-1">
                                       Dr. Barbara Ann Bailey, University of Illinois at Urbana-Champaign
                                       </font>
                                  </td>
                            </tr>
                            <tr>
                                  <td width="30%">
                                       <font size="-1">
                                       </font>
                                  </td>
                                <td width="70%" align="left" valign="top">
                                       <font size="-1">
                                       Dr. David E. Goldberg, University of Illinois at Urbana-Champaign
                                       </font>
                                  </td>
                            </tr>
         <!-- students -->
        <tr>
              <td width="30%" align="right" valign="top">
                   <font size="-1">
                   <b>Student(s):</b>
                   </font>
              </td>
                   <td width="70%" align="left" valign="top">
                        <font size="-1">
                        None Found
                        </font>
                   </td>
              </tr>
              </table>
              </td>
         </tr>
         </table>
         </td>
    </tr>
    </table>

    camickr
    I ran your program and it works great. This is the output I get. This is for a project that had 4 researchers, that is not always the case.
    investigator1 = r. Michael E. Welge
    investigator2 = Dr. Albert J. Valocchi
    investigator3 = Dr. Barbara Ann Bailey
    investigator4 = Dr. David E. Goldberg
    for some reason I loose the D in Dr. for the first Investigator.
    also, I know I need to modify my code to find out how many researchers there are. I then place them into the correct variable.
    example
    researchers String that your code works on: None Found</font></td></tr><!-- students --><tr><td width="30%" align="right" valign="top"><font size="-1"><b>Student(s):</b></font></td><td width="70%" align="left" valign="top"><font size="-1">Dr. Terry Hogan, Pennsylvania State University</font></td></tr><tr><td width="30%"><font size="-1"></font></td><td width="70%" align="left" valign="top"><font size="-1">Dr. Chengyu Shen, Pennsylvania State University</font></td></tr><tr><td width="30%"><font size="-1"></font></td><td width="70%" align="left" valign="top"><font size="-1">Dr. Anne Pifer, Pennsylvania State University</font></td></tr>
    investigator1 = one Found|Student(s):|Dr. Terry Hogan  // should be None Found.
    investigator2 = Dr. Chengyu Shen
    investigator3 = Dr. Anne Pifer
    npe errorjava.lang.ArrayIndexOutOfBoundsException: 3
    The logic should be, when I scrape between tags, if it should be "None Found" then skip to the next project ID , also, each project may have as many as 0, 1, 2, 3, 4 researchers. but no more than 4
    So I thought of doing an:
    If( researchers == 2)
        investigator1 = investigator[x];
        investigator2 = investigator[x];
    }etc...
    Thanks again.
    if you need me to email you the code. my email addres is [email protected]
    I know I am not that talented of a programmer, but I am learning, and trying all the time. I want to do this the correct way, but I am not always sure which way that is. I usually try a class Diagram and go from there, but I have had some trouble with this one. If you need more of an explanation then email me.
    orozcom

  • Can understand whats wrong with this code.

    I'm sort new to Java programing, and I created this simple converter, but when I try to complie it, it gives me an exception error, could some one tell me how to correct this code.
    import java.text.*;
    import javax.swing.*;
    public class Converter
         private final static double EURO = .8295577, YEN = 115.614, CAD = 1.17781;
         public static void main (String[] args)
               String input =null;
               double US= 0.0;
               DecimalFormat twoPrecision = new DecimalFormat("0.00");
             input() = 0
              try{
                   US = Double.parseDouble (input);
                    System.out.print("US to Euro: ");
                    System.out.println(twoPrecision.format(US * EURO));
                  US = Double.parseDouble (input);
                    System.out.print("US to Yen: ");
                    System.out.println(twoPrecision.format(US * YEN));
                  US = Double.parseDouble (input);
                    System.out.print("US to Cad: ");
                    System.out.println(twoPrecision.format(US * CAD));
              catch(NumberFormatException e)
                   JOptionPane.showMessageDialog(null,
                                    "You must enter a number",
                                    "Input data error",
                                    JOptionPane.ERROR_MESSAGE);
    }

    Try this:
    import java.text.*;
    import javax.swing.*;
    import java.io.*;
    public class Converter
         private final static double EURO = .8295577, YEN = 115.614, CAD = 1.17781;
         public static void main (String[] args)
               double US= 0.0;
               DecimalFormat twoPrecision = new DecimalFormat("0.00");
               try{
                   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
             String input=br.readLine();
                   US = Double.parseDouble (input);
                    System.out.print("US to Euro: ");
                    System.out.println(twoPrecision.format(US * EURO));
                  US = Double.parseDouble (input);
                    System.out.print("US to Yen: ");
                    System.out.println(twoPrecision.format(US * YEN));
                  US = Double.parseDouble (input);
                    System.out.print("US to Cad: ");
                    System.out.println(twoPrecision.format(US * CAD));
              catch(Exception e)
                   JOptionPane.showMessageDialog(null,
                                    "You must enter a number",
                                    "Input data error",
                                    JOptionPane.ERROR_MESSAGE);
    }

  • Whats  wrong with this code?

    Hi Experts,
    I am getting the error as " the method get_data has no returning parameter.
    Can someone please help me with this.
    CLASS main DEFINITION.
      PUBLIC SECTION.
        METHODS add_data IMPORTING i_data TYPE i.
        METHODS get_data EXPORTING e_data TYPE char20.
      PRIVATE SECTION.
        DATA attribute TYPE char01.
    ENDCLASS.
          CLASS main IMPLEMENTATION
    CLASS main IMPLEMENTATION.
      METHOD add_data.
        ADD i_data TO attribute.
      ENDMETHOD.
      METHOD get_data.
        CONCATENATE 'Attribute value' attribute
                                   INTO e_data SEPARATED BY space.
      ENDMETHOD.
    ENDCLASS.
    DATA: object_reference TYPE REF TO main.
    end-of-selection.
      CREATE OBJECT object_reference.
      DATA:
      var TYPE char20.
      CALL METHOD object_reference->add_data( i_data = 3 ).
    var = object_reference->get_data( ).  --> errored here
      WRITE var.

    Hi Dan, if you want to use a RETURNING parameter when you call you method, you need to define the parameter as a RETURNING parameter in your class definition.
        METHODS get_data RETURNING VALUE(e_data) TYPE char20.
    You had defined it as an EXPORTING parameter, which means that when you call the method you would have need to use this syntax instead.
       object_reference->get_data( IMPORTING e_data = var ).
    Regards,
    Rich Heilman

  • Passing events - whats wrong with this code?

    hi,
    I'm trying to get components to behave in a frame like they would as though I had written
    frame.getContentPane().add(thecomponent);
    by processing events explicitly. I've written the code below as a test, and it does work, but the events do not seem to be passed to the component at the right level.
    For example, when the JTree is the component tried it does not expand nodes when you click on them.
    Or if you tree a JButton then it doesn't actually visibly "click"
    I'm still quite new with Swing so any help would be really appreciated - is this kind of thing even possible?
    thanks,
    asjf
    import javax.swing.*;
    import java.util.*;
    import java.awt.*;
    import java.awt.event.*;
    public class EventTest extends Component
         Component notAttached;
         class SimpleMouseListener implements MouseListener
              String owner;
              Component passOnTo;
              SimpleMouseListener(String owner, Component passOnTo)
                   this.owner = owner;
                   this.passOnTo = passOnTo;
              public void mouseClicked(MouseEvent e){passOn(e);}
              public void mousePressed(MouseEvent e){passOn(e);}
              public void mouseReleased(MouseEvent e){passOn(e);}
              public void mouseEntered(MouseEvent e){passOn(e);}
              public void mouseExited(MouseEvent e){passOn(e);}
              public void passOn(MouseEvent e)
                   System.out.println(owner+" "+e);
                   if(passOnTo!=null)
                        passOnTo.dispatchEvent(
                             new MouseEvent(passOnTo,
                                                      e.getID(),
                                                      System.currentTimeMillis(),
                                                      e.getModifiers(),
                                                      e.getX(), // needs offsetting relative to parent
                                                      e.getY(), // needs offsetting relative to parent
                                                      e.getClickCount(),
                                                      e.isPopupTrigger()
         EventTest()
              super();
              notAttached = new JTree(); //JButton("Hello");
                   notAttached.setSize(100,100);
                   notAttached.setVisible(true);
                   notAttached.addMouseListener(new SimpleMouseListener("unattached component",null));
         public void paint(Graphics g){notAttached.paint(g);}
         static void main(String [] arg) throws Exception
              JFrame frame = new JFrame("Passing events test");
                   frame.setSize(640,480);
                   frame.setVisible(true);
                   EventTest et = new EventTest();
                   frame.getContentPane().add(et);
                   frame.addMouseListener(et.new SimpleMouseListener("Frame listener",et.notAttached));
    }

    Sorry
    It doesn't compile.
    I'm not sure how to create the 6 processes to each add part of sum and then update the total for the next processor to sum the next part up, and i don't know where it goes either.
    I think it would be something like:
    public void run()
    try
    //this add it up
    total= array + total;
    System.out.println("PROCESSOR"+thisnumber+" Your total is " + total);
    sleep();
    update(total)
    and then do the same code for another processor.
    I'm confused do I have to name each processor and put the name in :
    public void Processor1 ()
    please help I'm very confused
    }

  • What problem with this code

    Dear professional Javaer :)
    I have a code with much inbeliveble:
    import java.util.List;
    import java.util.ArrayList;
    class Test {
    private List<String> listStr = this.getListOfString();
    public Test() {
    System.out.println("Out: " + this.listStr);
    public List<String> getListOfString() {
    System.out.println("test");
    List<String> tmpList = new ArrayList<String>();
    tmpList.add("Temporary List.");
    return tmpList;
    public static void main(String[] args) {
    System.out.println("Begin main method...");
    Test t = new Test();
    And result is :
    {color:#ff0000}Begin main method...
    test
    Out: [Temporary List.]{color}
    My question is:
    Why contructor is created after call this.getListOfString();
    Why listStr = this.getListOfString();
    is legal because "this" is present by a object.
    Thanks.

    The following code should give a pretty complete picture of class initialization and construction
    class Super{
       static { System.out.println("Superclass static initializer"); }
       { System.out.println("Superclass instance initializer"); }
       int x = initX();
       public Super(){
          System.out.println("Superclass constructor");
       private int initX() { System.out.println("Superclass.x initialization"); return 0; }
    class Child extends Super{
       static { System.out.println("Child class static initializer"); }
       { System.out.println("Child class instance initializer"); }
       int y = initY();
       public Super(){
          System.out.println("Child class constructor");
       private int initY() { System.out.println("Child.y initialization"); return 0; }
    class Main{
       public static void main(String[] args){
          System.out.println("Creating instance of Child");
          new Child();
          System.out.println("\nCreating instance of Super");
          new Super();
    }

  • Please tell me whats wrong with this code for sendRedirect

    /**AckController.java**/
    import java.io.IOException;
    import javax.servlet.RequestDispatcher;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import javax.servlet.http.HttpSession;
    import java.sql.*;
    import java.util.*;
    * @version      1.0
    * @author
    public class AckController extends HttpServlet {
         * @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
         public void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
              System.out.println("in AckController.doGet():action: "+req.getParameter("action"));
              String viewName = "";
              viewName = "/TransportersLogin/jsp/dealerAck/DealerAddAck.jsp";
              req.setAttribute("temp","temp");
              System.out.println("1..in AckController.doGet():viewName: "+viewName);     
              resp.sendRedirect(viewName);
         * @see javax.servlet.http.HttpServlet#void (javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
         public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
              doGet(req,resp);
    /*********end of servlet**********/
    /****DealerAddAck.jsp****/
    <%@ page session="true" language="java" %>
    <%@ page import="javax.servlet.*,javax.servlet.http.*,java.net.*"%>
    <%
    response.setHeader("Cache-Control","no-cache"); //HTTP 1.1
    response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
    response.setHeader("Pragma","no-cache"); //HTTP 1.0
    %>
    <html>
    <head>
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    <title>New Page 1</title>
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