Need help in Queue Implementation

MyQueue
public class MyQueue {
     private int start, end;
     private int[] qArray;
     private int size;
     MyQueue(int size){
          this.size = size;
          qArray = new int[size];
          start = end = -1;
     public int removeFromQueue(){
          int retVal = -1;
          if(isEmpty()){
               System.out.println("Queue is empty");
          }else{
               retVal = qArray[++start];
          return retVal;
     public void addToQueue(int element){
          if((end+1) < size ){
               qArray[++end] = element;
          }else{
               System.out.println("Queue is full. Please flush out someone");
     private boolean isEmpty(){
          return (start==end);
     public String toString(){
          StringBuffer buffer = new StringBuffer();
          for(int i = start; i< end; i++){
               buffer.append(qArray[i]+" ");
          return buffer.toString();
MyQueueImpl
public class MyQueueImpl {
     public static void main(String args[]){
          MyQueue myQueue = new MyQueue(10);
          for(int i = 0; i< 10; i++){
               myQueue.addToQueue((int)(i+ Math.random()));
          System.out.println(myQueue);
          System.out.println("Removing 3 guys from the queue");
          System.out.println(myQueue.removeFromQueue());
          System.out.println(myQueue.removeFromQueue());
          System.out.println(myQueue.removeFromQueue());
          System.out.println("Adding 10 to the queue");
          myQueue.addToQueue(10);
          System.out.println(myQueue);
          System.out.println();
}

public class MyQueue {
     private int start, end;
     private int[] qArray;
     private int size;
     MyQueue(int size){
          this.size = size;
          qArray = new int[size];
          start = end = -1;
     public int removeFromQueue(){
          int retVal = -1;
          if(isEmpty()){
               System.out.println("Queue is empty");
          }else{
               retVal = qArray[++start];
          return retVal;
     public void addToQueue(int element){
          if((end+1) < size ){
               qArray[++end] = element;
          }else{
               System.out.println("Queue is full. Please flush out someone");
     private boolean isEmpty(){
          return (start==end);
     public String toString(){
          StringBuffer buffer = new StringBuffer();
          for(int i = start; i< end; i++){
               buffer.append(qArray[i]+"   ");
          return buffer.toString();
}public class MyQueueImpl {
     public static void main(String args[]){
          MyQueue myQueue = new MyQueue(10);
          for(int i = 0; i< 10; i++){
               myQueue.addToQueue((int)(i+ Math.random()));
          System.out.println(myQueue);
          System.out.println("Removing 3 guys from the queue");
          System.out.println(myQueue.removeFromQueue());
          System.out.println(myQueue.removeFromQueue());
          System.out.println(myQueue.removeFromQueue());
          System.out.println("Adding 10 to the queue");
          myQueue.addToQueue(10);
          System.out.println(myQueue);
          System.out.println();

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sc.next();sc.next();sc.next();sc.next();
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//Exceptions to be caught
catch (FileNotFoundException e)
System.out.println("Error opening file");
System.exit(0);
catch (IOException e)
System.out.println("IO error!");
System.exit(0);
/* Bubblesort method used to sort the array in ascending alphabetical order
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bubbleSort(customerList);
          return i;
/* The method displayRecords() displays the data of the customer records on
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public static void displayRecords()
int k;
/* Displaying text using the printf() method */
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public static void writeFile()
/* Try block to enclose statements that might throw an exception, followed by
the catch block to handle the exception */
try
int i;
          int n=0;
//PrintWriter class used to write contents of studentList to specified file
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for(i=0;i<noOfCustomers;i++)
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pwStream.println("Address = "+customerList[i].getAddress());
pwStream.println("DOB = "+customerList[i].getBirthdate());
pwStream.println("Phone Number = "+customerList[i].getPhone());
          pwStream.printf("Account Balance = %.2f\n", customerList[i].getBalance());
          pwStream.println("Account Type = "+customerList[i].getAccType());
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          pwStream.println();
          n++;
//Closure of stream
pwStream.close();
          System.out.println(+n+" records written.");
catch(IOException e)
System.out.println("IO error!");
System.exit(0);
     //Deletes specified record from list
public static void deleteRecord(int id)
int i;
          i=locate(id);
if(i==200)
//checking if account to be deleted does not exist
System.out.println("Error: no account with the id of "+id+" found!");
          //if account exists
else
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                         customerList[i] = customerList[i+1];
                         i++;
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public static void update(double interest)
int i,j,k;
          double custBalance,addition=0;
for(i=0;i<noOfCustomers;i++)
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                    else if(customerList[i] instanceof Account2)
                         continue;
                    else if(customerList[i] instanceof Account3)
                         for(j=0;j<30;j++)
addition=customerList[i].getBalance()*((Account3)customerList[i]).getFixed();
custBalance=customerList[i].getBalance()+addition;
customerList[i].setBalance(custBalance);
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System.out.printf("Name = %s\n", customerList[k].getName());
System.out.printf("Account Balance = %.2f\n", customerList[k].getBalance());
System.out.println();
/* ================== Additional methods ==================== */
/* Bubblesort method to sort the customerList in ascending alphabetical
     order according to customer's name */
public static void bubbleSort(Customer[] x)
int pass, index;
Customer tempValue;
for(pass=0; pass<noOfCustomers-1; pass++)
for(index=0; index<noOfCustomers-1; index++)
if(customerList[index].getName().compareToIgnoreCase(customerList[index+1].getName()) > 0)
tempValue = x[index];
x[index] = x[index+1];
x[index+1]= tempValue;
/* Method used to check for duplicated ids in array */
     public static boolean checkDuplicate(int id)
          int i;
          for(i=0;i<noOfCustomers;i++)
               if(id == customerList[i].getId())
System.out.println("Account Id = "+id+" already exists");
                    System.out.println();
return true;
          }return false;
/* Method to seach for account id in array */
     public static int locate(int id)
          int j;
          for(j=0;j<noOfCustomers;j++)
               if(customerList[j].getId()==id)
                    return j;
          j=200;
          return j;
import java.util.Scanner;
public class Customer
/* The following private variables are declared so that the data is only
     accessible to its own class,but not to any other class, thus preventing
     other classes from referring to the data directly */
     protected int id;
     protected String name,address,birthdate,phone,accType;
     protected double balance;
// Null constructor of Customer
     public Customer()
          id = 0;
          name = null;
          address = null;
          birthdate = null;
          phone = null;
          balance = 0;
          accType = null;
/* The following statements with the keyword this activates the Customer
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//this is the object reference that stores the receiver object
          this.id = id;
          this.name = name;
          this.address = address;
          this.birthdate = birthdate;
          this.phone = phone;
          this.balance = balance;
          this.accType = accType;
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          birthdate = custBirthdate;
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          phone = custPhone;
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     public void setAccType (String custAccType)
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          super(id,name,address,birthdate,phone,balance,accType);
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          this.name = name;
          this.address = address;
          this.birthdate = birthdate;
          this.phone = phone;
          this.balance = balance;
          this.accType = accType;
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          super(id,name,address,birthdate,phone,balance,accType);
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          this.address = address;
          this.birthdate = birthdate;
          this.phone = phone;
          this.balance = balance;
          this.accType = accType;
class Account3 extends Customer
     protected double fixed=0;
     public Account3(int id, String name, String address, String birthdate, String phone, double balance, String accType, double fixed)
          super(id,name,address,birthdate,phone,balance,accType);
          this.id = id;
          this.name = name;
          this.address = address;
          this.birthdate = birthdate;
          this.phone = phone;
          this.balance = balance;
          this.accType = accType;
          this.fixed = fixed;
     public double getFixed()
          return fixed;
Example of a customers.txt
Account Id = 123
Name = Matt Damon
Address = 465 Ripley Boulevard, Oscar Mansion, Singapore 7666322
DOB = 10-10-1970
Phone Number = 790-3233
Account Balance = 405600.00
Account Type = Fixed
Fixed Daily Interest = 0.05
Account Id = 126
Name = Ben Affleck
Address = 200 Hunting Street, Singapore 784563
DOB = 25-10-1968
Phone Number = 432-4579
Account Balance = 530045.00
Account Type = Saving
Account Id = 65
Name = Salma Hayek
Address = 45 Mexican Boulevard, Hotel California, Singapore 467822
DOB = 06-04-73
Phone Number = 790-0000
Account Balance = 2345.00
Account Type = Checking
Account Id = 78
Name = Phua Chu Kang
Address = 50 PCK Avenue, Singapore 639798
DOB = 11-08-64
Phone Number = 345-6780
Account Balance = 0.00
Account Type = Checking
Account Id = 234
Name = Zoe Tay
Address = 100 Blue Eyed St, Singapore 456872
DOB = 15-02-68
Phone Number = 456-1234
Account Balance = 600.00
Account Type = Saving

1) When you post code, please use[code] and [/code] tags as described in Formatting tips on the message entry page. It makes it much easier to read.
2) Don't just post a huge pile of code and ask, "How do I make this work?" Ask a specific question, and post just enough code to demonstrate the problem you're having.
3) Don't just write a huge pile of code and then test it. Write a tiny piece, test it. Then write the piece that will work with or use the first piece. Test that by itself--without the first piece. Then put the two together and test that. Only move on to the next step after the current step produces the correct results. Continue this process until you have a complete, working program.

Need Help In Solving Writing To Queue Problem

Hi Guys,
I have two threads that are adding to the same message queue. The first one is suppose to add four integers consecutively. Meanwhile the second thread add an integer in between the four integers. Because of that my application is not working properly. I would like that when a thread is adding then the other must wait before it adds. The method that the threads call to add to the queue are all synchronized, but it is still behaving like that.
I need help in solving it.
Thanks.
Edited by: kap on Aug 9, 2010 5:22 AM

kap wrote:
Please what do you mean by synchronizing on the same object? Can you explain it to me?
When you synchronize a block of Java code, you synchronize on a particular object, which is called the Monitor.
The effect is only to prevent another thread running this, or another block of code synchronized on the same object.
If you use synchronized methods, then the monitor is the object to which the method belongs (or the class if the method is static). The same synchronized method can be executed simultaneously on a different instance of the object.

Need help on Multi level menu implementation

Hi All,
Need help on Multi level menu implementation
Thanks,
Anu

Hi Anu,
Please go through this link Implement Multilevelmenu navigation
Thanks,

I need help with a textArea which wont implement a JScrollpane

I have created a text area, but when the words get to the bottom there is no scrollbar. I tried implementing the scrollpane to the text area, but it doesnt work. I added it to a panel, then the panel to the frame.
(Here are the snippits of coding that I have)
public class RPS extends JFrame implements ActionListener, ItemListener
JTextArea textDisplay = new JTextArea(50,30);
JScrollPane jscrollpane = new JScrollPane(textDisplay);
//constructor?
public RPS()
///various menu items in here and buttons with action listeners
public void createPanel()
     JPanel outputPanel = new JPanel();
          outputPanel.setLayout(new GridLayout(1,1));
          outputPanel.setBorder(BorderFactory.createTitledBorder("TEXT IN HERE"));
          outputPanel.add(textDisplay);
//further down
          JPanel rightPanel = new JPanel(new GridLayout(3,1));
          JPanel leftPanel = new JPanel(new GridLayout(1,1));
     leftPanel.add(outputPanel);
          add(leftPanel);
          add(rightPanel);
     public static void main(String[] args)
          JFrame frame = new RPS();
          frame.setLayout(new GridLayout(1,2));
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setVisible(true);
}So what I have is a frame, with two panels. One on the left and one on the right. The textDisplay (text area) is displayed on the outputPanel, which is then added to the left panel, then added to the frame. The right panel is for all the buttons which I left out to keep this simple.
Can anyone help me please? All the other irrelevant coding has been left out.
Need help asap please :( I was sure everything is correct.

you add the textArea to the scrollPane
JScrollPane jscrollpane = new JScrollPane(textDisplay);but then you add (only) the textArea to the panel
outputPanel.add(textDisplay);whereas you should be adding the scrollpane to the panel
outputPanel.add(jscrollpane);

Help needed on Logging Servlet Implementation using high traffic HTTP Post

I have a servlet called LogServlet, which accepts the post HTTP request Data from another application and logs it into a file. The key thing here is the logs should get logged in a squence it is received.
Since the frequency of the data being sent is very high the LogServlet is not able to keep it up with the sequence and messing up the sequence.
Are there any suggestions on how to improve this and make sure the servlet logs it in the way it receives it?
Can I replace the Servlet with JSP to do the logging and will that solve my sequence issue?
Or there are any other techniques.
Thanking you in advance.

You could use the log4j logging tool, it uses a static Logger for the class and you can run it in synchronized mode to ensure that your log messages don't clobber each other. Hmm, you're testing my knowledge of how synchronization is implemented in Java. It uses a semaphore-style approach under the covers, but is it a fair-style (first-come, first-served) implementation?
After a quick Google search I just learned that in the normal VM fairness is not guaranteed, but if you use the Sun Real-Time VM synchronized will guarantee FIFO style access to synchronized resources. The Real-Time VM is not free, so if cost is an issue that might not be an option for you. That's going to make things more complicated for you since ordering sounds important.
You can probably write something fairly easily to do what you want. Basically write a queue processing class that uses either static methods/variables or a Singleton approach to ensure that your messages get processed in a FIFO order. Then just use your existing logging logic or use log4j to write your messages to a log file. There are several pitfalls to writing multi-threaded components like this, so be careful that you've synchronized the right methods and, depending on how you decide to implement it, use the right Queue implementation (hint: you may need to look in the java.util.concurrent package for your queue implementation, depending on the approach you take.)
One thing to note, this last approach may be overkill depending on what you mean by "very high frequency." If you're getting 10-20 requests a second, I think you still might be able to get away with log4j in synchronized mode. It also depends on how important the ordering really is. If one request arrives 500 microseconds after the other, is it okay to reverse the ordering? If so then syncrhonized log4j may still be okay. If not, then you're going to have to write something a little more sophisticated or take a closer look at the capabilities of the real-time VM.
Alternatively, someone who's more knowledgeable than me on the subject might be able to suggest a better approach using JMS.

Need help with Business One Implementation Consultant Certification

Hello,
I need help preparing for the B1 certification. I have taken the test once already and failed. I found it very tricky with multiple correct answers for each question.
I have gone thru the eLearning several times now. And this week I am taking the instructor led training. I have also purchased and studied the Ebook. I have a good grasp of the product, but I feel that this is not enough to help prepare for the test.
I want to know if there are any other resources I could use to help prepare for the test. Are there any practice exams
Any and all help is appreciated
Thank you!
John
jseftonATsophlogic.com

Hi John,
I found the e-learning good , but a bit limited, so I branched out to these & passed quite well :
- documentation links on the 2007 landing page:
Channel Partner Portal -> Solutions -> SAP Business One -> Hot Topics -> 2007
- ETS:
Channel Partner Portal -> Solutions -> SAP Business One -> Support -> Training & Knowledge
- DRC:
Channel Partner Portal -> Solutions -> SAP Business One -> Support -> Documentation resource centre
Hope it helps & good luck!
All the best,
kerstin

Implementing web service Client? need help

hi,
i need to develop a funciton in java that takes WSDL address as a input. and using the web service address, start the web service programmatically from that function. the web service could be any.
i need help and suggestion what to do in the area, how can i start this, as i am a new bie.
thanks
Farurkh

I got the following error.
But If I call it from a jsp page or a servlet. Nothing happend, Transaction is successful.
java.lang.NullPointerException
     at org.apache.commons.discovery.resource.ClassLoaders.getAppLoaders(ClassLoaders.java:206)
     at org.apache.axis.AxisProperties.getClassLoaders(AxisProperties.java:118)
     at org.apache.axis.AxisProperties.getNameDiscoverer(AxisProperties.java:105)
     at org.apache.axis.AxisProperties.getResourceClassIterator(AxisProperties.java:112)
     at org.apache.axis.configuration.EngineConfigurationFactoryFinder$1.run(EngineConfigurationFactoryFinder.java:116)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:113)
     at org.apache.axis.configuration.EngineConfigurationFactoryFinder.newFactory(EngineConfigurationFactoryFinder.java:160)
     at org.apache.axis.client.Service.getEngineConfiguration(Service.java:813)
     at org.apache.axis.client.Service.getAxisClient(Service.java:104)
     at org.apache.axis.client.Service.<init>(Service.java:113)
     at org.tempuri.wsdl.EFSnet2Locator.<init>(EFSnet2Locator.java:10)
     at com.ipharmacy.payment.Payment.main(Payment.java:12)

Need help in Queue Implementation

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