Help with Simple JAVA program

I'm a complete novice with Java. I want to write a Java program to run on Windows 2000 servers to write a list of certain files in a directory into a *.txt file. I hope to add complexity once I have this basic part working. Here's the code I have so far:
//this Java application finds poll* files
public class FindPollApp
//Create File Object
File dir = new File("d:/jda/windss/poll");
//List directory
if(dir.isDirectory())
String[] dirContents = dir.list();
for (int i=0; i < dirContents.length; i++)
System.out.println(dirContents);
//Iterate through files
I get the following errors:
C:\JAVA>javac FindPollApp.java
FindPollApp.java:9: illegal start of type
if(dir.isDirectory())
^
FindPollApp.java:18: <identifier> expected
^
2 errors
Thanks.

I'm a complete novice with Java. I want to write a
Java program to run on Windows 2000 servers to write
a list of certain files in a directory into a *.txt
file. I hope to add complexity once I have this
basic part working. Here's the code I have so far:
//this Java application finds poll* files
public class FindPollApp
//Create File Object
File dir = new File("d:/jda/windss/poll");
//List directory
if(dir.isDirectory())
String[] dirContents = dir.list();
for (int i=0; i < dirContents.length; i++)
System.out.println(dirContents);
//Iterate through files
I get the following errors:
C:\JAVA>javac FindPollApp.java
FindPollApp.java:9: illegal start of type
if(dir.isDirectory())
^
FindPollApp.java:18: <identifier> expected
^
2 errors
Thanks.
You need to create a method and insert your if statement in there

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How do I write a JAVA program that could be used as the start of an MS-DOS/Windows simulation of the IEEE 802.3 protocol? I am to only code the parts necessary to build the 802.3 frame. For the initial implementation, the Checksum function need not be a CRC function, and the Destination and Source addresses wil be in input, stored, and output, and in dotted-decimal format.
I need:
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etc.
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I have no experience with Java. Can you help me or start me in the right direction?
Thanks...........TK

If you have no experience with Java, then it seems to me your first step should be to start learning the language. But it's difficult to advise how, since we don't know anything about your background. There are many good books available on Java, some are for beginners and some are for advanced programmers, so I'd suggest you go somewhere that has a large selection and start looking for something that doesn't seem completely over your head.

Need Help with a Java program

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I am doing a bachelor of Multimedia and for some reason I was forced to do Programming 1 which is just Java programing.I have been doing pretty well but we have the final exam coming up on Thursday and they told us to learn how to do this question but I have no idea how to do it, could someone please help me?
Write a program that reads a file containing a list of students' student numbers and names, and then writes out another file in which the students have been formed into project groups.
Sample input file:
96439530 Naranek, Kosh
08532109 Ivanova, Susan
87642078 Sheridan, John
44327889 Varner, Dell
98100023 Kotto, Vir
66345689 Sinclair, Jeffrey
77421009 Garibaldi, Michael
88775544 Winters, Talia
54321098 Alexander, Lyta
12345098 Mollari, Londo
03465499 Takashima, Laurel
88765432 Kyle, Benjamin
08876500 Keffer, Warren
07687878 Cole, Marcus
For the project course: no group should have more than 5 members; and it is desireable that all groups have as close to 5 members as possible; and that students be allocated to groups alphabetically by family name, as in this sample output file:
Group 1:
Lyta Alexander (54321098)
Susan Ivanova (08532109)
Benjamin Kyle (88765432)
John Sheridan (87642078)
Dell Varner (44327889)
Group 2:
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Warren Keffer (08876500)
Londo Mollari (12345098)
Jeffrey Sinclair (66345689)
Talia Winters (88775544)
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Vir Kotto (98100023)
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I'm sorry too annoy you again but I don't know how to implement what you told me. Here is my current code:
import java.io.*;
import java.util.*;
class DetailSortTest {
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               in.close();
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     public static void main(String[] args) {
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How would I do it I tried:
NLine.split(data[2]+""+data[1]+""+data[0]);
But all that displays is null, null, null
I know I am probably so stupid but I really appreciate the help

Help with a java program

Hello. I'm posting in these forums because I really don't know where else to go. I have been trying for the past several days to figure out how to go about writing my program but to no avail. The project requires reading many lines each containing several different elements from a datafile named "DATA". A few examples of some lines from that file:
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since im not a pro like some of the guys on here :),
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regards,
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Hi, I have just recently started how to use arrays[] in Java and I'm a bit confused and need help designing a program.
What this program does, it reads in a range of letters specified by the user. The user then enters the letters (a, b or c) and stores these characters into an array, which the array's length is equal to the input range the user would enter at the start of the program. The program is then meant to find how many times (a,b and c) appears in the array and the Index it first appears at, then prints these results.
Here is my Code for the program, hopefully this would make sense of what my program is suppose to do.
import B102.*;
class Letters
 static int GetSize()
 int size = 0;
 boolean err = true;
 while(err == true)
 Screen.out.println("How Many Letters would you like to read in?");
 size = Keybd.in.readInt();
 err = Keybd.in.fail();
 Keybd.in.clearError();
 if(size <= 0)
 err = true;
 Screen.out.println("Invalid Input");
 return(size);
 static char[] ReadInput(int size)
 char input;
 char[] letter = new char[size];
 for(int start = 1; start <= size; start++)
 System.out.println("Please enter a letter (a, b or c) ("+size+" max), enter # to stop:");
 input = Keybd.in.readChar();
 while((input != 'a') && (input != 'b') && (input != 'c') && (input != '#'))
 Screen.out.println("Invalid Input");
 System.out.println("Please enter a letter (a, b or c) ("+size+" max, enter # to stop:");
 input = Keybd.in.readChar();
 while(input == '#')
 start == size;
 break;
 for(int i = 0; i < letter.length; i++)
 letter[i] = input;
 return(letter);
 static int CountA(char[] letter)
 int acount = 0;
 for(int i = 0; i < letter.length; i++)
 if(letter[i] == 'a')
 acount++;
 return(acount);
 static int CountB(char[] letter)
 int bcount = 0;
 for(int i = 0; i < letter.length; i++)
 if(letter[i] == 'b')
 bcount++;
 return(bcount);
 static int CountC(char[] letter)
 int ccount = 0;
 for(int i = 0; i < letter.length; i++)
 if(letter[i] == 'c')
 ccount++;
 return(ccount);
 static int SearchA(char[] letter)
 int ia;
 for(ia = 0; ia < letter.length; ia++)
 if(letter[ia] == 'a')
 return(ia);
 return(ia);
 static int SearchB(char[] letter)
 int ib;
 for(ib = 0; ib < letter.length; ib++)
 if(letter[ib] == 'b')
 return(ib);
 return(ib);
 static int SearchC(char[] letter)
 int ic;
 for(ic = 0; ic < letter.length; ic++)
 if(letter[ic] == 'c')
 return(ic);
 return(ic);
 static void PrintResult(char[] letter, int acount, int bcount, int ccount, int ia, int ib, int ic)
 if(ia <= 1)
 System.out.println("There are "+acount+" a's found, first appearing at index "+ia);
 else
 System.out.println("There are no a's found");
 if(ib <= 1)
 System.out.println("There are "+bcount+" b's found, first appearing at index "+ib);
 else
 System.out.println("There are no b's found");
 if(ic <= 1)
 System.out.println("There are "+ccount+" c's found, first appearing at index "+ic);
 else
 System.out.println("There are no c's found");
 return;
 public static void main(String args[])
 int size;
 char[] letter;
 int acount;
 int bcount;
 int ccount;
 int ia;
 int ib;
 int ic;
 size = GetSize();
 letter = ReadInput(size);
 acount = CountA(letter);
 bcount = CountB(letter);
 ccount = CountC(letter);
 ia = SearchA(letter);
 ib = SearchB(letter);
 ic = SearchC(letter);
 PrintResult(letter, acount, bcount, ccount, ia, ib, ic);
 return;
} Some errors i get with my program are:
When reading in the letters to store into the array, I get the last letter I entered placed into the entire array. Also I believe my code to find the Index is incorrect.
Example Testing: How many letters would you like to read? 3
Enter letter (a, b or c) (# to quit): a
Enter letter (a, b or c) (# to quit): b
Enter letter (a, b or c) (# to quit): c
It prints "There are no a's'" (there should be 1 a at index 0)
"There are no b's" (there should be 1 b at index 1)
and "There are 3 c's, first appearing at index 0" ( there should be 1 c at index 2)
The last thing is that my code for when the user enters "#" that the input of letters would stop and the program would then continue over to the counting and searching part for the letters, my I believe is correct but I get the same problem as stated above where the program takes the character "#" and stores it into the entire array.
Example Testing:How many letters would you like to read? 3
Enter letter (a, b or c) (# to quit): a
Enter letter (a, b or c) (# to quit): #
It prints "There are no a's'" (should have been 1 a at index 0)
"There are no b's"
and "There are no c's"
Can someone please help me??? or does anyone have a program simular to this they have done and would'nt mind showing me how it works?
Thanks
lou87.

Without thinking too much...something like this
for(int start = 0; start < size; start++) {
 System.out.println("Please enter a letter (a, b or c) ("+size+" max), enter # to stop:");
 input = Keybd.in.readChar();
 while((input != 'a') && (input != 'b') && (input != 'c') && (input != '#')) {
 Screen.out.println("Invalid Input");
 System.out.println("Please enter a letter (a, b or c) ("+size+" max, enter # to stop:");
 input = Keybd.in.readChar();
 if(input == '#') {
 break;
 letter[start] = input;
 }you dont even need to do start = size; coz with the break you go out of the for loop.

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--------------------Configuration: Pong - JDK version 1.6.0_02 <Default> - <Default>--------------------
F:\Documents\AP Computer Science-Java Applications\Pong\Pong\src\Pong.java:106: cannot find symbol
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1. If you're using an IDE such as NetBeans or Eclipse, do a "Clean Project", then a "Build All". See if that clears up the problem.
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/**Write a program that asks the user for the price and quantity of up to 10 items. The program accepts input until the user enters a price of 0.
*The program applies a 7% sales tax and prints the total cost.
Sample
Enter price 1:
1.95
Enter quantity 1:
2
Enter price 2:
5.00
Enter quantity 2:
1
Enter price 3:
0
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static double userinput = 1;
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int anykey;
int howmanyproducts;
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int whichproduct = 1;//used to say what
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double aftertax = 0;
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double [] finalquant = new double[9];
double [] finalanswer = new double[9];
double taxrate = .07;
int index = 0;
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 userinput = input.nextDouble();
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 userinput = input.nextInt();
 finalquant[index] = userinput;
 whichquanity ++;
 index ++;
else
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}

I tried ot indent better so it is more readable and i removed the tax out of my loop along with another thing i knew wasnt supposed to be their. Ran it again and i still got the same total coast = 0.0
import java.util.*;
public class Cashregister
static Scanner input = new Scanner(System.in);
static double userinput = 1;
public static void main(String[] args)
int anykey;
int howmanyproducts;
System.out.println("This Program will allow you to enter the price and quanity of a set of items until you press zero, and after you press zero it will put the tax on it and give you the subtotal.");
int whichproduct = 1;
int whichquanity = 1;
double beforetax = 0;
double aftertax = 0;
double [] finalproduct = new double [9];
double [] finalquant = new double[9];
double [] finalanswer = new double[9];
double taxrate = .07;
int index = 0;
while(userinput !=0)
 System.out.println("Enter price " + whichproduct + ":");
 userinput = input.nextDouble();
 whichproduct ++;
 if(userinput != 0)
 finalproduct[index] = userinput;
 System.out.println("Enter quanity " + whichquanity + ":");
 userinput = input.nextInt();
 finalquant[index] = userinput;
 whichquanity ++;
 index ++;
 else
 int [] indecies = new int [index];
 for(int j = 0; j<indecies.length; j++)
 finalanswer[index] = finalproduct[index] * finalquant[index];
 for(int k = 0; k < indecies.length; k++)
 finalanswer[0] = finalanswer[k] + finalanswer[k];
 beforetax = finalanswer[0];
 aftertax = beforetax * taxrate;
 System.out.println("The total cost with tax will be $" + aftertax);
}

Need help with basic Java programming

I'm having a little bit of trouble with my code. For the sake of argument, I've removed the code I'm having trouble with, because I know it was inaccurate. I'm trying to create a loop so that this program will keep going through and through until the user enters an invalid variable. I thought the default after the case statements was supposed to make the system exit and output my message. Those two problems, the loop and the default, are what I'm really having problems with. My code is posted below.
import javax.swing.JOptionPane;
import java.util.Locale;
import java.text.NumberFormat;
public class Retail
public static void main(String args[])
String firstNum;
String secondNum;
String result;
int prodNum; //first number to input
double quantity; //second number to input
double total = 0.0; //total of Prod * Quantity Sold for all items
// To use American Dollar
NumberFormat moneyFormat = NumberFormat.getCurrencyInstance( Locale.US );
// first number entered as string
firstNum = JOptionPane.showInputDialog( "Enter product number 1-5" );
// second number entered as string
secondNum = JOptionPane.showInputDialog( " Enter quantity of items sold" );
// convert values to type double or int from type string
prodNum = Integer.parseInt( firstNum );
quantity = Double.parseDouble( secondNum);
result="";
if ( prodNum >=1 && prodNum <=5 ) {
switch (prodNum)
case 1: // 1st product
total = 2.98 * quantity;
break;
case 2: // 2nd product
total = 4.50 * quantity;
break;
case 3: // 3rd product
total = 9.98 * quantity;
break;
case 4: //4th product
total = 4.49 * quantity;
break;
case 5:
total = 6.87 * quantity;
break;
default: JOptionPane.showMessageDialog( null, "Wrong product number entered" );
JOptionPane.showMessageDialog( null, moneyFormat.format(total), "Total Price of Items Purchased", JOptionPane.INFORMATION_MESSAGE );
System.exit(0);
***I know I need to put something in the user input message to state that any value other than 1-5 entered will cause the program to skip to the output, I'll put that in later.***

When you post code, please use [code] and [/code] tags as described in Formatting Help on the message entry page. It makes it much easier to read and prevents accidental markup from array indices like [i].

Need Help with a Java programming exercise.

I have to Write a program that reads two times in military format (0900, 1730) and prints the number of hours and minutes between two times. Supply your own test program. Here are two sample runs. User inputs are the numbers.
Please enter the first time: 0900
Please enter the second time: 1730
8 hours 30 minutes
Please enter the first time: 1730
Please enter the second time: 0900
15 hours 30 minutes
Test Program I can write up myself. But the entire constructor I have no idea how to start. This is basic Java Coding. no C++ no importing anything.
So far this is what I got and I'm sure it's wrong:
public class TimeInterval
private double hours;
private double minutes;
public TimeInterval(double Time1, double Time2)
hours =
minutes =
}

tad2382 wrote:
Jverd,
I'm guessing that in your early days on this forum you must have spent a lot of time explaining constructors, object creation, etc. Now, after some 40K posts to the forum, you figure newbies should just go and read the documentation. Is that what a lot of veteran posters feel?Perhaps the OP is not aware of the fact the Sun has a good deal of high quality study material published on their website. What's wrong with posting it in a thread? Why should one copy the same thing over and over again? If after reading that tutorial, the OP still has some questions about it, s/he is free to post a follow up question. I am sure that many of the regulars here are more than happy to answer them.
Also note that the OP's problem description is rather vague. A "I don't know where to start" is IMO best answered by a link to a comprehensive tutorial or a beginners book.
Being one of the (relatively) novice posters on the forum, I still feel the need to customize posts,Well, by all means: do so.
trying to see things from the poster's side. Maybe after a few thousand posts, I'll just keep throwing the same documentation at newbies, instead of detailed customized responses, heh.IMO, that's a load of cr@p.

Help! Simple Java Program.

Here is the problem: Write a program that creates a loan amortization table. The user of the program will supply values for Initial Loan Principal, Annual Percentage Rate and Monthly Payment. The program should print out the appropriate amortization table including the number of Monthly Payments and the Total Interest paid for the life of the loan. The program should allow multiple
runs (up to 4 different versions) of the table process and should allow the
user to compare runs in a tabular format.
This is what I have so far and should work one I completely debug it. I am really new to Java, and I thinks it is somthing to do with the Array. I recently switched from C++ to Java, so I don't think I have the syntax down correctly. Thanks.
import javax.swing.JOptionPane;
public class Program_01
 public static void main(String [] args)
 int Runs;
 do{
 String Run_Question = JOptionPane.showInputDialog(null, "How many times,would you like to run" +
 " the program? (Up to four runs only!)", "Run Question", JOptionPane.QUESTION_MESSAGE);
 Runs = Integer.parseInt(Run_Question);
 if( Runs < 0 || Runs > 4)
 JOptionPane.showMessageDialog(null, "The number is not valid, try again!", "Error",
 JOptionPane.INFORMATION_MESSAGE);
 }while(Runs < 0 || Runs > 4);
 Questions(Runs);
 public static void Questions(int Runs)
 for(int index = 0;index < Runs;index ++)
 String Loan_Principle_String = JOptionPane.showInputDialog(null, "What is the Loan Principle?", "Loan Amount",
 JOptionPane.QUESTION_MESSAGE);
 String Percentage_Rate_String = JOptionPane.showInputDialog(null, "What is the Annual Percentage Rate?",
 "Interest Rate", JOptionPane.QUESTION_MESSAGE);
 String Monthly_Payment_String = JOptionPane.showInputDialog(null, "What is the Monthly Payment", "Payment",
 JOptionPane.QUESTION_MESSAGE);
 double Loan_Principle = Double.parseDouble(Loan_Principle_String);
 double Percentage_Rate = Double.parseDouble(Percentage_Rate_String);
 double Monthly_Payment = Double.parseDouble(Monthly_Payment_String);
 Calculate(Loan_Principle, Percentage_Rate, Monthly_Payment);
 public static void Calculate (double Loan, double Percentage, double Monthly)
 double[] Principle = new double[]{0,0};
 double[] Interest = new double[]{0,0};
 double[] Remain = new double[]{0,0};
 double Monthly_Percent = Percentage/12;
 double MPR = ((int)((Monthly_Percent + .005) * 100.) / 100.);
 boolean Over = true;
 double Borrowed = Loan;
 int Month = 0;
 for (int index = 0; Over != false; index++)
 double Rate = MPR * Loan;
 double decimalRate = ((int)((Rate + .005) * 100.) / 100.);
 Interest[index] = decimalRate;
 double Prince = Monthly - decimalRate;
 double decimalPrince = ((int)((Prince + .005) * 100.) / 100.);
 Principle[index]= decimalPrince;
 double Rmn = Borrowed - decimalPrince;
 Borrowed = Rmn;
 double decimalRmn = ((int)((Rmn + .005) * 100.) / 100.);
 Remain[index] = decimalRmn;
 if(Monthly > Remain[index] && Remain[index] > 0)
 Monthly = Remain[index];
 Over = false;
 Month += 1;
 System.out.println("I am here!" + Month);
 System.out.println("Payment #" + " " + "Principle" + " " + "Payment" + " " + "APR" + " " + "MPR" +
 " " + "Interest Payment" + " " + "Principle Payment");
 System.out.println("------------------------------------------------------------------------");
 for(int index = 0; index < Month; index++)
 System.out.println((index + 1) + "\t" + Remain[index] + "\t" + Percentage + "\t" + MPR + "\t" + Interest[index]
 + "\t" + Principle[index]);
}

Okay, here is my updated code. I am having trouble outputting my formate to align with each category.
import javax.swing.JOptionPane;
import java.text.DecimalFormat;
public class Program_01
 public static void main(String [] args)
 int Runs;
 do
 String Run_Question = JOptionPane.showInputDialog(null, "How many times would you like to run" +
 " the program? (Up to four runs only!)", "Run Question", JOptionPane.QUESTION_MESSAGE);
 Runs = Integer.parseInt(Run_Question);
 if( Runs < 0 || Runs > 4)
 JOptionPane.showMessageDialog(null, "The number is not valid, try again!", "Error",
 JOptionPane.INFORMATION_MESSAGE);
 }while(Runs < 0 || Runs > 4);
 Questions(Runs);
 public static void Questions(int Runs)
 for(int index = 0;index < Runs;index ++)
 String Loan_Principle_String = JOptionPane.showInputDialog(null, "What is the Loan Principle?", "Loan Amount",
 JOptionPane.QUESTION_MESSAGE);
 String Percentage_Rate_String = JOptionPane.showInputDialog(null, "What is the Annual Percentage Rate?",
 "Interest Rate", JOptionPane.QUESTION_MESSAGE);
 String Monthly_Payment_String = JOptionPane.showInputDialog(null, "What is the Monthly Payment", "Payment",
 JOptionPane.QUESTION_MESSAGE);
 double Loan_Principle = Double.parseDouble(Loan_Principle_String);
 double Percentage_Rate = Double.parseDouble(Percentage_Rate_String);
 double Monthly_Payment = Double.parseDouble(Monthly_Payment_String);
 Calculate(Loan_Principle, Percentage_Rate, Monthly_Payment);
 public static void Calculate (double Loan, double Percentage, double Monthly)
 double[] Principle = new double[100];
 double[] Interest = new double[100];
 double[] Remain = new double[100];
 double[] Payment = new double[100];
 DecimalFormat Decimal = new DecimalFormat(".00");
 double Total_Interest = 0;
 double T_Interest;
 double Monthly_Percent = (Percentage/12)/100;
 double MPR = Monthly_Percent;
 boolean Over = true;
 double Borrowed = Loan;
 double Deposit = Monthly;
 int Month = 0;
 for (int index = 0; Over = true; index++)
 double Rate = MPR * Borrowed;
 double decimalRate = round(Rate,2);
 Interest[index] = decimalRate;
 Remain[index] = Borrowed;
 Month += 1;
 if(Monthly > Remain[index ] && Remain[index ] > 0)
 for(int count = 0; count <= Month; count++)
 Total_Interest += Interest[count];
 T_Interest = round(Total_Interest,2);
 Payment[index] = T_Interest;
 Deposit = T_Interest;
 else
 Payment[index] = Deposit;
 double Prince = Deposit - decimalRate;
 double decimalPrince = round(Prince,3);
 Principle[index]= decimalPrince;
 System.out.println("I am here!" + decimalPrince);
 double Rmn = Borrowed - decimalPrince;
 double decimalRmn = round(Rmn,2);
 Borrowed = decimalRmn;
 if(Monthly > Remain[index ] && Remain[index ] > 0)
 Over = false;
 break;
 System.out.println("Payment #" + " " + "Principle" + " " + "Payment" + " " + "Percentage" + " " + "MPR" +
 " " + "Interest Payment" + " " + "Principle Payment");
 System.out.println("----------------------------------------------------------------------------");
 for(int index = 0; index < Month; index++)
 System.out.println(" " + (index + 1) + "\t " + Decimal.format(Remain[index]) + " " +
 Decimal.format(Payment[index]) + " " + Decimal.format(Percentage) + " " + MPR +
 "\t" + Decimal.format(Interest[index]) + "\t\t" + Decimal.format(Principle[index]));
 T_Interest = ((int)((Total_Interest + .005) * 100.) / 100.);
 System.out.println("\n\t\t\t" + "Total Interest Paid \t" + T_Interest + "\n");
 for(int index = 0; index < Month; index++)
 System.out.printf("%f %f\n", Principle[index],Remain[index]);
 public static double round(double val, int places) {
 long factor = (long)Math.pow(10,places);
 // Shift the decimal the correct number of places
 // to the right.
 val = val * factor;
 // Round to the nearest integer.
 long tmp = Math.round(val);
 // Shift the decimal the correct number of places
 // back to the left.
 return (double)tmp / factor;
}

Help with simple bidding program

I have a BiddingServer and a BiddingClient, Everytime a client connects it connects twice for some reason, and shows "New Bidder Accepted" twice... Can't work out why, any help appreciated.... I dont know whether the problem is here or in the client and i appreciate its looong so if no one spots a problem here ill post the client....
import java.io.*;
import java.net.*;
import java.text.DecimalFormat;
import java.util.*;
public class BiddingServer
 private static ServerSocket servSocket;
 private static final int PORT = 1234;
 public static Scanner keyboard = new Scanner(System.in);
 public static String itemDescripOne = "TV", itemCodeOne = "123";
 public static String itemDescripTwo = "Toaster", itemCodeTwo = "321";
 public static float itemPriceOne = 100, itemPriceTwo = 200;
 public static Calendar deadlineOne;
 public static Calendar deadlineTwo;
 private static int clientCount =0;
 public static void main(String[] args)throws IOException
 Calendar start = Calendar.getInstance();
 int date = start.get(Calendar.DATE);
 int month = start.get(Calendar.MONTH);
 int year = start.get(Calendar.YEAR);
 System.out.printf("\nEnter First Item's finishing bid time");
 String timeString = BiddingServer.keyboard.nextLine();
 String hourString = timeString.substring(0,2);
 int hour = Integer.parseInt(hourString);
 String minString = timeString.substring(3,5);
 int minute = Integer.parseInt(minString);
 BiddingServer.deadlineOne = Calendar.getInstance();//Set up Calendar object to hold deadline time...
 BiddingServer.deadlineOne.set(year,month,date,hour,minute,0);
 System.out.println("\nEnter Second Item's finishing bid time:\n");
 String timeString1 = BiddingServer.keyboard.nextLine();
 String hourString1 = timeString1.substring(0,2);
 int hour1 = Integer.parseInt(hourString1);
 String minString1 = timeString1.substring(3,5);
 int minute1 = Integer.parseInt(minString1);
 BiddingServer.deadlineTwo = Calendar.getInstance();//Set up Calendar object to hold deadline time...
 BiddingServer.deadlineTwo.set(year,month,date,hour1,minute1,0);
 System.out.println("Opening port...\n");
 try
 servSocket = new ServerSocket(PORT);
 catch (IOException e)
 System.out.println("\nUnable to set up port!");
 System.exit(1);
 do
 Socket client = servSocket.accept();
 clientCount++;
 //Wait for client.
 System.out.println("\nNew bidder accepted.\n");
 ClientHandler handler = new ClientHandler(client, clientCount);
 handler.start();
 }while (true);
 class ClientHandler extends Thread
 private Socket client;
 private Scanner input, keyboard;
 private PrintWriter output;
 int clientNumber;
 public ClientHandler(Socket socket, int count) throws IOException
 client = socket;
 clientNumber = count;
 keyboard = new Scanner(System.in);
 input = new Scanner(client.getInputStream());
 output = new PrintWriter(client.getOutputStream(),true);
 public void run()
 String userInput;
 float price, priceTwo ;
 output.println(BiddingServer.itemDescripOne);
 output.println(BiddingServer.itemCodeOne);
 output.println(getDateTime(BiddingServer.deadlineOne));
 output.println(BiddingServer.itemDescripTwo);
 output.println(BiddingServer.itemCodeTwo);
 output.println(getDateTime(BiddingServer.deadlineTwo));
 do
 userInput = input.nextLine();
 Calendar now = Calendar.getInstance();
 if (userInput.startsWith("number of bidders"))
 System.out.println("Number of Bidders Online " + clientNumber);
 output.println(clientNumber);
 else if ((userInput.startsWith(BiddingServer.itemCodeOne)) && (userInput.endsWith("Status")))
 System.out.println("item price one");
 output.println(BiddingServer.itemPriceOne);
 if ((userInput.startsWith(BiddingServer.itemCodeOne)) && (userInput.endsWith("Status")) && (now.after(BiddingServer.deadlineOne)))
 System.out.println("-1, bidding for item ended");
 output.println("-1");
 else if (userInput.startsWith(BiddingServer.itemCodeOne))
 price = Float.parseFloat(userInput.substring(BiddingServer.itemCodeOne.length() +1));
 if ((price > BiddingServer.itemPriceOne) && (now.before(BiddingServer.deadlineOne)))
 //bidForItem();
 System.out.println("Bid Accepted");
 output.println("Bid Accepted");
 BiddingServer.itemPriceOne = price;
 else if (now.after(BiddingServer.deadlineOne))
 System.out.println("Late Bid");
 output.println("Late Bid");
 else if ((price <= BiddingServer.itemPriceOne) && (now.before(BiddingServer.deadlineOne)))
 System.out.println("Low Bid");
 output.println("Low Bid");
 if ((userInput.startsWith(BiddingServer.itemCodeTwo)) && (userInput.endsWith("Status")))
 System.out.println("item price one");
 output.println(BiddingServer.itemPriceOne);
 else if ((userInput.startsWith(BiddingServer.itemCodeTwo)) && (userInput.endsWith("Status")) && (now.after(BiddingServer.deadlineTwo)))
 System.out.println("-1, bidding for item ended");
 output.println("-1");
 else if (userInput.startsWith(BiddingServer.itemCodeTwo))
 priceTwo = Float.parseFloat(userInput.substring(BiddingServer.itemCodeTwo.length() +1));
 if ((priceTwo > BiddingServer.itemPriceTwo) && (now.before(BiddingServer.deadlineTwo)))
 System.out.println("Bid Accepted");
 output.println("Bid Accepted");
 BiddingServer.itemPriceTwo = priceTwo;
 else if (now.after(BiddingServer.deadlineTwo))
 System.out.println("Late Bid");
 output.println("Late Bid");
 else if ((priceTwo <= BiddingServer.itemPriceTwo) && (now.before(BiddingServer.deadlineTwo)))
 System.out.println("Low Bid");
 output.println("Low Bid");
 }while (true);
 public String getDateTime(Calendar dateTime)
 //Create DecimalFormat object to ensure 2 dec places...
 DecimalFormat decFormat = new DecimalFormat("00");
 //Now extract hours and minutes, each with 2 digits
 //(i.e., with leading zeroes if needed)...
 String hour2Digits =
 decFormat.format(dateTime.get(Calendar.HOUR_OF_DAY));
 String min2Digits =
 decFormat.format(dateTime.get(Calendar.MINUTE));
 return(dateTime.get(Calendar.DATE) + "/"
 + (dateTime.get(Calendar.MONTH)+1) + "/"
 + dateTime.get(Calendar.YEAR) + " "
 + hour2Digits + ":" + min2Digits);
 }

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
public class BiddingClient extends JFrame implements ActionListener
 private InetAddress host;
 private final int PORT = 1234;
 private Socket link;
 private Scanner networkInput,keyboard;
 private PrintWriter output;
 private JPanel itemInfo, buttonPanel, comboPanel, headingPanel, selectItemPanel,personalPanel,biddingText;
 private JLabel label1,label2,label3, label4, label,label5, labelCode, labelDescrip,
 labelDeadline, labelPrice,bidStatus,label6,label7;
 private JComboBox itemSelection;
 private JButton bidButton, statusButton, noOfBiddersButton, quitButton;
 private JTextField bid;
 String [] code = new String [2];
 String [] desc = new String [2];
 String [] deadline = new String [2];
 public static void main(String[] args) throws IOException
 BiddingClient frame = new BiddingClient();
 frame = new BiddingClient();
 frame.setTitle("Welcome " + System.getProperty("user.name"));
 Dimension screenSize =
 Toolkit.getDefaultToolkit().getScreenSize();
 int screenWidth = (int)screenSize.getWidth();
 int screenHeight = (int)screenSize.getHeight();
 int frameWidth=430 ,frameHeight=300;
 frame.setSize(frameWidth,frameHeight);
 frame.setLocation((screenWidth-frameWidth)/2,
 (screenHeight-frameHeight)/2);
 frame.setVisible(true);
 frame.setDefaultCloseOperation(EXIT_ON_CLOSE);
 public BiddingClient () throws IOException
 addWindowListener(
 new WindowAdapter()
 public void windowClosing(WindowEvent e)
 if (link != null)
 try
 link.close();
 catch (IOException ioEx)
 System.out.println(
 "\n*** Unable to close link!***\n");
 System.exit(1);
 System.exit(0);
 try
 host = InetAddress.getLocalHost();
 catch(UnknownHostException uhEx)
 System.out.println("\nHost ID not found!\n");
 System.exit(1);
 personalPanel = new JPanel(new FlowLayout());
 setLayout(new BorderLayout());
 label6 = new JLabel("Welcome... " + System.getProperty("user.name"));
 label6.setFont (new Font("Edwardian Script ITC",Font.PLAIN,26));
 personalPanel.add(label6, BorderLayout.CENTER);
 personalPanel.setBackground(Color.lightGray);
 add(personalPanel, BorderLayout.NORTH);
 comboPanel = new JPanel(new BorderLayout());
 //comboPanel.setBorder(BorderFactory.createLineBorder(Color.red));
 itemSelection = new JComboBox();
 comboPanel.add(itemSelection, BorderLayout.EAST);
 itemSelection.addActionListener(this);
 add(comboPanel, BorderLayout.NORTH);
 selectItemPanel = new JPanel(new BorderLayout());
 label5 = new JLabel("Please Select An Item From The List:");
 selectItemPanel.add(label5, BorderLayout.CENTER);
 add(selectItemPanel, BorderLayout.WEST);
 headingPanel = new JPanel(new FlowLayout());
 String myText4 = "<HTML>Information On Item";
 label = new JLabel(myText4);
 headingPanel.add(label);
 //headingPanel.setBorder(BorderFactory.createLineBorder(Color.white));
 add(headingPanel, BorderLayout.CENTER);
 comboPanel.add(headingPanel, BorderLayout.SOUTH);
 comboPanel.add(selectItemPanel, BorderLayout.WEST);
 comboPanel.add(personalPanel, BorderLayout.NORTH);
 itemInfo = new JPanel(new GridLayout(6,1));
 String myText = "<HTML>Description : ";
 label1 = new JLabel(myText);
 itemInfo.add(label1);
 labelDescrip = new JLabel();
 labelDescrip.setFont (new Font("ComicSans",Font.PLAIN,12));
 itemInfo.add(labelDescrip);
 String myText1 = "<HTML>Code : ";
 label2 = new JLabel(myText1);
 label2.setFont (new Font("Arial Narrow",Font.BOLD,13));
 itemInfo.add(label2);
 labelCode = new JLabel();
 labelCode.setFont (new Font("ComicSans",Font.PLAIN,12));
 itemInfo.add(labelCode);
 String myText2 = "<HTML>Deadline : ";
 label3 = new JLabel(myText2);
 itemInfo.add(label3);
 labelDeadline = new JLabel();
 labelDeadline.setFont (new Font("ComicSans",Font.PLAIN,12));
 itemInfo.add(labelDeadline);
 String myText3 = "<HTML>Price : ";
 label4 = new JLabel(myText3);
 itemInfo.add(label4);
 labelPrice = new JLabel("Click Status To View Price ");
 labelPrice.setFont (new Font("ComicSans",Font.PLAIN,12));
 itemInfo.add(labelPrice);
 bidStatus = new JLabel("");
 itemInfo.add(bidStatus);
 add(itemInfo, BorderLayout.CENTER);
 biddingText = new JPanel(new FlowLayout());
 bid = new JTextField("Enter Bid Here",10);
 bid.addActionListener(this);
 biddingText.add(bid);
 add(biddingText, BorderLayout.SOUTH);
 bidButton = new JButton("Place Bid");
 biddingText.add(bidButton);
 bidButton.addActionListener(this);
 statusButton = new JButton("Status");
 biddingText.add(statusButton);
 statusButton.addActionListener(this);
 noOfBiddersButton = new JButton("No. Of Bidders");
 biddingText.add(noOfBiddersButton);
 noOfBiddersButton.addActionListener(this);
 quitButton = new JButton("Quit");
 biddingText.add(quitButton);
 quitButton.addActionListener(this);
 add(biddingText, BorderLayout.SOUTH);
 link = new Socket(host, PORT);
 networkInput = new Scanner(link.getInputStream());
 output = new PrintWriter(link.getOutputStream(),true);
 keyboard = new Scanner(System.in);
 getItems();
 System.out.println("haha");
 public void getItems()
 for (int i = 0; i <2 ; i++)
 desc[i] = networkInput.nextLine();
 code[i] = networkInput.nextLine();
 deadline[i] = networkInput.nextLine();
 itemSelection.addItem(code);
 public void actionPerformed(ActionEvent e)
 if (e.getSource()== itemSelection)
 labelDescrip.setText(desc[itemSelection.getSelectedIndex()]);
 labelCode.setText(code[itemSelection.getSelectedIndex()]);
 labelDeadline.setText(deadline[itemSelection.getSelectedIndex()]);
 }else if ((e.getSource()== bidButton) || (e.getSource() == bid))
 output.println(labelCode.getText() + " " + bid.getText());
 JOptionPane.showMessageDialog(null,networkInput.nextLine());
 //bidStatus.setText(networkInput.nextLine());
 //System.out.println(bidStatus.getText());
 }else if (e.getSource()== statusButton)
 output.println(labelCode.getText()+ "Status");
 labelPrice.setText(networkInput.nextLine());
 if (labelPrice.getText().equals("-1"))
 labelPrice.setText("Bidding Time Is Up On This Item");
 else
 labelPrice.setVisible(true);
 }else if (e.getSource()== noOfBiddersButton)
 output.println("number of bidders");
 JOptionPane.showMessageDialog(null,"Number Of Bidders Online\n "+ networkInput.nextLine()
 ,"Information", JOptionPane.INFORMATION_MESSAGE);
 }else if (e.getSource() == quitButton)
 try
 JOptionPane.showMessageDialog(this,"Closing down connection...",
 "Warning", JOptionPane.WARNING_MESSAGE);
 System.out.println("*Connection Closed*");
 link.close();
 System.exit(0);
 catch(IOException ioex)
 System.out.println("***Disconnection problem!***");
 System.exit(1);

Help with inventory Java program

Hello,
I've been working on this and couldn't get what's the problem is :(
Can somebody explain to me what would be the problems?
import java.util.Scanner;
public class Product
 public static void main(String[] args)
 Scanner s = new Scanner(System.in);
 System.out.print("Enter the item number: ");
 int item = s.nextInt();
 System.out.print("Enter the product name: ");
 String product = s.next();
 System.out.print("Enter the unit: ");
 int unit = s.nextInt();
 System.out.print("Enter the price for each unit: ");
 double price = s.nextDouble();
 product p = new product(item, product, unit, price);
 System.out.println("You entered: ");
 System.out.print("Item: " + p.getItemNumber() + "\nProduct: " + p.getProductName() + "\nUnits: " + p.getUnits() + "\nPricePerUnit: " + p.getPriceUnit() + "\n");
 System.out.println("Here is the value of inventory :" + p.getPriceInventory());
class Inventory1
 private int itemNumber;
 private String productName;
 private int Unit;
 private double priceUnit;
 public Inventory1(int itemNumber, String productName, int Unit, double priceUnit)
 this.itemNumber = itemNumber;
 this.productName = productName;
 this.Unit = Unit;
 this.priceUnit = priceUnit;
 public int getItemNumber()
 return itemNumber;
 public void setItemNumber(int itemNumber)
 this.itemNumber = itemNumber;
 public double getPriceUnit()
 return priceUnit;
 public void setPriceUnit(double priceUnit)
 this.priceUnit = priceUnit;
 public String getProductName()
 return productName;
 public void setProductName(String productName)
 this.productName = productName;
 public int getUnit()
 return Unit;
 public void setUnit(int Unit)
 this.Unit = Unit;
 public double getPriceInventory()
 double number = getUnit() * getPriceUnit();
 return number;
}Build output:
--------------------Configuration: <Default>--------------------
java:10: class Product is public, should be declared in a file named Product.java
public class Product
 ^
TestProduct.java:23: cannot find symbol
symbol : class product
location: class Product
 product p = new product(item, product, unit, price);
 ^
TestProduct.java:23: cannot find symbol
symbol : class product
location: class Product
 product p = new product(item, product, unit, price);
 ^
3 errors
Process completed.General output:
java.lang.NoClassDefFoundError: Product
Caused by: java.lang.ClassNotFoundException: Product
 at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main"
Process completed.Help!!
Thank you in advance

I adjusted and this time it says:
Build Output
--------------------Configuration: <Default>--------------------
16: cannot find symbol
symbol : variable product
location: class Product
 Product p = new Product(item, product, unit, price);
 ^
16: internal error; cannot instantiate Product.<init> at Product to ()
 Product p = new Product(item, product, unit, price);
 ^18: cannot find symbol
symbol : method getItemNumber()
location: class Product
 System.out.print("Item: " + p.getItemNumber() + "\nProduct: " + p.getProductName() + "\nUnits: " + p.getUnits() + "\nPricePerUnit: " + p.getPriceUnit() + "\n");
 ^
18: cannot find symbol
symbol : method getProductName()
location: class Product
 System.out.print("Item: " + p.getItemNumber() + "\nProduct: " + p.getProductName() + "\nUnits: " + p.getUnits() + "\nPricePerUnit: " + p.getPriceUnit() + "\n");
 ^
18: cannot find symbol
symbol : method getUnits()
location: class Product
 System.out.print("Item: " + p.getItemNumber() + "\nProduct: " + p.getProductName() + "\nUnits: " + p.getUnits() + "\nPricePerUnit: " + p.getPriceUnit() + "\n");
 ^
18: cannot find symbol
symbol : method getPriceUnit()
location: class Product
 System.out.print("Item: " + p.getItemNumber() + "\nProduct: " + p.getProductName() + "\nUnits: " + p.getUnits() + "\nPricePerUnit: " + p.getPriceUnit() + "\n");
 ^
19: cannot find symbol
symbol : method getPriceInventory()
location: class Product
 System.out.println("Here is the value of inventory :" + p.getPriceInventory());
 ^
7 errors
Process completed.General Output
--------------------Configuration: <Default>--------------------
java.lang.NoClassDefFoundError: Product
Caused by: java.lang.ClassNotFoundException: Product
 at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
Exception in thread "main"
Process completed.(>_<)
I forgot to mention...
That I need to create a product class that holds the item number, the name of the product, the number of units in stock and the price of each unit (I think I got this part)
I need to create a Java application that displays the product number, the name of the product, the number of units in stock, the price of each unit, and the value of the inventory (the number of units in stock multiplied by the price of each unit).
Edited by: yodartas on Sep 27, 2008 7:54 PM

A simple Java program to be compiled with ojc and executed with java.exe

Hi ,
This thread is relevant to Oracle Java Compiler (file ojc) and jave.exe file.
I have written a simple java program which consists of two simple simple classes and using the JDev's 10.1.3.2 ojc and java files , i'm trying to execute it after the successful compilation....
The problem is that trying to run it... the error :
Exception in thread "main" java.lang.NoClassDefFoundError: EmployeeTest
appears.
How can i solve this problem...????
The program is as follows:
import java.util.*;
import corejava.*;
public class EmployeeTest
{ public static void main(String[] args)
 { Employee[] staff = new Employee[3];
 staff[0] = new Employee("Harry Hacker", 35000,
 new Day(1989,10,1));
 staff[1] = new Employee("Carl Cracker", 75000,
 new Day(1987,12,15));
 staff[2] = new Employee("Tony Tester", 38000,
 new Day(1990,3,15));
 int i;
 for (i = 0; i < 3; i++) staff.raiseSalary(5);
for (i = 0; i < 3; i++) staff[i].print();
class Employee
{ public Employee(String n, double s, Day d)
{ name = n;
salary = s;
hireDay = d;
public void print()
{ System.out.println(name + "...." + salary + "...."
+ hireYear());
public void raiseSalary(double byPercent)
{ salary *= 1 + byPercent / 100;
public int hireYear()
{ return hireDay.getYear();
private String name;
private double salary;
private Day hireDay;
For compilation... i use :
D:\ORACLE_UNZIPPED\JDeveloper_10.1.3.2\jdev\bin\ojc -classpath D:\E-Book\Java\Sun_Java_Book_I\Corejava EmployeeTest.java
For execution , i issue the command:
D:\ORACLE_UNZIPPED\JDeveloper_10.1.3.2\jdk\bin\java EmployeeTest
NOTE:I tried to use the jdk of Oracle database v.2 but the error :
Unable to initialize JVM appeared....
Thanks , a lot
Simon

Hi,
Thanks god....
I found a solution without using Jdev.....
C:\oracle_files\Java\Examples>SET CLASSPATH=.;D:\E-Book\Java\Sun_Java_Book_I\Corejava
C:\oracle_files\Java\Examples>D:\ORACLE_UNZIPPED\JDeveloper_10.1.3.2\jdk\bin\javac EmployeeTest.java
C:\oracle_files\Java\Examples>D:\ORACLE_UNZIPPED\JDeveloper_10.1.3.2\jdk\bin\java EmployeeTest
What does Ant has to do with this?Sorry, under the Ant tree a classpath label is found....I'm very new to Java and JDev...
You need to include the jar file that has the Day method in it inside project properties->libraries.I have not .jar file.. just some .java files under the corejava directory.... By the way , I have inserted the corejava directory to the project pressing the button Add Jar/Directory.... , but the problem insists..
Thanks , a lot
Simon

Help with Simple JAVA program

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