Java student needs help please.

I'm a new CS major, I'm having a hell of a time with a java project.
Write a program to read in a list of nonnegative integers and to ouput the largest integer, smallest interger, an the average of the integers. The end of the input is indicated by the user entering a negative sentinel value.
Any ideas would be greatly appreciated

Bobsters wrote:
well...im sorry to have an attitude. Now...let's move on.
This is as far as i have gotten.
import java.util.*;
public class Project2_1
public static void(String[] args)
double largest, smallest, average;
System.out.println("Enter some nonnegative intergers.");
System.out.println("Enter a negative integer after you have");
System.out.println("entered the nonnegative integers.");Is that it? If you're too simple-minded to work out anything more than that, please don't take CS courses. Best advice I can give you is, sign up again with another user name, wait about a week so we've forgotten you, then try again. And mind your manners next time round

Similar Messages

I'm new to java and need help please

I have an assignment involves modifying a previous assignment. the code for the previous assigment is shown below.(it was required to be done as an applet this assigment can be an application or an applet) I'm trying to modify this code to read a text file (items.txt) that looks like this:
item # description price(this line does not appear in the text file)
001 shaving cream 400.00
999 razors 30.00
I need to load the item# and price from the text file into arrays(I have no clue how to use multi-dimensional arrays in java and would prefer not to)
I need to search the arrays based on the values entered by the user (item # and quantity) calculate the total for that item then create a new text file which has each line item for that order in the form:
item# quant price per item total(price per item*quant entered)
also also I need to be able to display the four items listed above after each loop as well as all the previous item number and quantities they selected until they indicate they don't want to select anymore.
I've been working on this for days and it seems like nothing I try works. My major problems are:
1. I have no idea how to read the text file and load those 2 items into their respective arrays
2. I can't seem to create a textfile that looks like text for the output file.
code]
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.Locale;
public class arraySelection
extends JApplet {
//Initialize the applet
private Container getContentPane=null;
public void init() {
String string_item, string_quantity;
String output = "";
String description= "";
int counter= 0;
int itemNumber= 0;
double quantity = 0 ;
double tax_rate=.07;
double total= 0, price= 0;
double tax, subtotal;
double Pretotal= 0;
double priceArray[] = {1, .5, 3.65, 0.02, 0.09};
String descriptionArray[] = {"salt", "pepper", "paprika", "garlic", "thyme"};
// create number format for currency in US dollar format
NumberFormat moneyFormat = NumberFormat.getCurrencyInstance( Locale.US );
//format to have the total with two digits precision
DecimalFormat twoDigits = new DecimalFormat("0.00");
//Jtextarea to display results
JTextArea outputArea = new JTextArea ();
// get applet's content pane
Container container = getContentPane ();
//attach output area to container
container.add(outputArea);
//set the first row of text for the output area
output += "Invoice\nItem#\tDescription\tQuant@Price\t Line Total" + "\n";
do //begin loop structure obtain input from user
// obtain item number from user
string_item = JOptionPane.showInputDialog(
"Please enter an item number 1, 2, 3, 4, or 5:");
//obtain quantity of each item that user enter
string_quantity = JOptionPane.showInputDialog("Enter the quantity:");
// convert numbers from type String to Integer or Double
itemNumber = Integer.parseInt(string_item);
quantity = Double.parseDouble(string_quantity);
switch (itemNumber) {//Determine input from user to assign price and description
case 10: // user input item =10
price = priceArray[0];
description = descriptionArray[0];
break;
case 20: // user input item =20
price = priceArray [1];
description = descriptionArray[1];
break;
case 30: //user input item =30
price=priceArray[2];
description = descriptionArray[2];
break;
case 40: //user input item =40
price=priceArray[3];
description = descriptionArray[3];
break;
case 50: //user input item =50
price=priceArray[4];
description = descriptionArray[4];
break;
default: // user input item is not on the list
output += "Invalid value entered"+ "\n";
price=0;
description= "";
//Calculates the total for each item number and stores it in subtotal
subtotal = price * quantity;
//display input from user
output += itemNumber + "\t" + description + "\t\t"+ quantity + "@" +
moneyFormat.format( price) + "\t" + moneyFormat.format( subtotal) + "\n";
//accumulates the overall subtotal for all items
Pretotal = Pretotal + subtotal;
//verifies that the user wants to stop entering data
string_item = JOptionPane.showInputDialog(" Enter a positive integer to continue or 0 to stop. ");
itemNumber = Integer.parseInt(string_item);
// loop termination condition if user's input is 0 .It will end the loop
} while ( itemNumber!= 0);
tax = Pretotal * tax_rate; // calculate tax amount
total = Pretotal + tax; //calculate total = subtotal + tax
//appends data regarding the subtotal, tax, and total to the output area
output += "\n" + "Order Subtotal" + "\t" + moneyFormat.format( Pretotal) +
"\n" + "Tax" + "\t\t" + twoDigits.format( tax ) + "\n" + "Order Total" +
"\t\t" + moneyFormat.format( total );
//attaches the data in the output variable to the output area
outputArea.setText( output );
} //end init
}// end applet Invoice
Any help or sugestions would be greatly appreaciated. I've been working on this for over a week and everything I try goes nowhere.

item # description price(this
line does not appear in the text file)
001 shaving cream 400.00
999 razors 30.00
I need to load the item# and price from the text file
into arrays(I have no clue how to use
multi-dimensional arrays in java and would prefer not
to)That's good, because you shouldn't use multidimensional arrays here. You should have a one-dimensional array (or java.util.List) of objects that encapsulate each line.
I've been working on this for days and it seems like
nothing I try works. My major problems are:
1. I have no idea how to read the text file and load
those 2 items into their respective arrays
2. I can't seem to create a textfile that looks like
text for the output file.The java.io package has file reading/writing classes.
Here's a tutorial:
http://java.sun.com/docs/books/tutorial/essential/io/index.html

I'm new to java and need help please(repost)

I have an assignment involves modifying a previous assignment. the code for the previous assigment is shown below.(it was required to be done as an applet this assigment can be an application or an applet) I'm trying to modify this code to read a text file (items.txt) that looks like this:
item # description price(this line does not appear in the text file)
001 shaving cream 400.00
999 razors 30.00
I need to load the item# and price from the text file into arrays(I have no clue how to use multi-dimensional arrays in java and would prefer not to)
I need to search the arrays based on the values entered by the user (item # and quantity) calculate the total for that item then create a new text file which has each line item for that order in the form:
item# quant price per item total(price per item*quant entered)
also also I need to be able to display the four items listed above after each loop as well as all the previous item number and quantities they selected until they indicate they don't want to select anymore.
I've been working on this for days and it seems like nothing I try works. My major problems are:
1. I have no idea how to read the text file and load those 2 items into their respective arrays
2. I can't seem to create a textfile that looks like text for the output file.
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.Locale;
public class arraySelection
    extends JApplet {
//Initialize the applet
private Container getContentPane=null;
public void init() {
       String string_item, string_quantity;
       String output = "";
       String description= "";
       int counter= 0;
       int itemNumber= 0;
       double quantity = 0 ;
       double tax_rate=.07;
       double total= 0, price= 0;
       double tax, subtotal;
       double Pretotal= 0;
       double priceArray[] = {1, .5, 3.65, 0.02, 0.09};
       String descriptionArray[] = {"salt", "pepper", "paprika", "garlic", "thyme"};
     // create number format for currency in US dollar format
     NumberFormat moneyFormat = NumberFormat.getCurrencyInstance( Locale.US );
     //format to have the total with two digits precision
     DecimalFormat twoDigits = new DecimalFormat("0.00");
     //Jtextarea to display results
     JTextArea outputArea = new JTextArea ();
     // get applet's content pane
      Container container = getContentPane ();
      //attach output area to container
      container.add(outputArea);
     //set the first row of text for the output area
    output += "Invoice\nItem#\tDescription\tQuant@Price\t Line Total" + "\n";
    do //begin loop structure obtain input from user
           // obtain item number from user
           string_item = JOptionPane.showInputDialog(
               "Please enter an item number 1, 2, 3, 4, or 5:");
           //obtain quantity of each item that user enter
           string_quantity = JOptionPane.showInputDialog("Enter the quantity:");
           // convert numbers from type String to Integer or Double
           itemNumber = Integer.parseInt(string_item);
           quantity = Double.parseDouble(string_quantity);
             switch (itemNumber) {//Determine input from user to assign price and description
                case 10: // user input item =10
                  price = priceArray[0];
                  description = descriptionArray[0];
                  break;
                case 20: // user input item =20
                  price = priceArray [1];
                  description = descriptionArray[1];
                  break;
                case 30: //user input item =30
                  price=priceArray[2];
                  description = descriptionArray[2];
                  break;
                case 40: //user input item =40
                  price=priceArray[3];
                  description = descriptionArray[3];
                  break;
                case 50: //user input item =50
                  price=priceArray[4];
                  description = descriptionArray[4];
                  break;
                default: // user input item is not on the list
                output += "Invalid value entered"+ "\n";
                price=0;
                description= "";
         //Calculates the total for each item number and stores it in subtotal
         subtotal = price * quantity;
         //display input from user
         output += itemNumber + "\t" + description + "\t\t"+ quantity + "@" +
                   moneyFormat.format( price) + "\t" + moneyFormat.format( subtotal) + "\n";
         //accumulates the overall subtotal for all items
         Pretotal = Pretotal + subtotal;
        //verifies that the user wants to stop entering data
        string_item = JOptionPane.showInputDialog(" Enter a positive integer to continue or 0 to stop. ");
        itemNumber = Integer.parseInt(string_item);
      // loop termination condition if user's input is 0 .It will end the loop
   } while ( itemNumber!= 0);
    tax = Pretotal * tax_rate; // calculate tax amount
    total = Pretotal + tax; //calculate total = subtotal + tax
    //appends data regarding the subtotal, tax, and total to the output area
    output += "\n" + "Order Subtotal" + "\t" + moneyFormat.format( Pretotal) +
              "\n" + "Tax" + "\t\t" + twoDigits.format( tax ) + "\n" + "Order Total" +
              "\t\t" + moneyFormat.format( total );
     //attaches the data in the output variable to the output area
     outputArea.setText( output );
} //end init
}// end applet InvoiceAny help or sugestions would be greatly appreaciated. I've been working on this for over a week and everything I try goes nowhere.

First answer: You shouldn't ask multiple questions in the same thread. Ask a specific question, with an appropriate subject line (optionally, assign the number of Dukes you are willing to give for the help). When question #1 is answered and question #2 arises, it's time for a new thread (don't forget to give out Dukes before moving on).
Second answer: I think you need a Transfer Object (http://java.sun.com/blueprints/patterns/TransferObject.html). It's whole purpose is to hold/transfer instance data where it is needed. Create a class something like this:
public class ItemTO
    private String _number;
    private String _description;
    private double _price;
    public ItemTO( String number, String description, double price )
        _number = number;
        _description = description;
        _price = price
    // Getter/Setter methods go here
}then, in the code where you read in the file do something like this:
BufferedReader input = null;
try
    input = new BufferedReader( new FileReader( "c:\\a.txt" ) );
    List items = new ArrayList();
    String line;
    String itemNumber;
    String itemDescription;
    double itemPrice;
    while ( (line = input.readLine() ) != null )
     System.out.println( line );
        itemNumber = // Parse it from line
        itemDescription // Parse it from line
        itemPrice = // Parse it from line
        items.add( new ItemTO( itemNumber, itemDescription, itemPrice ) );
catch ( FileNotFoundException fnfe )
    fnfe.printStackTrace();
catch ( IOException ioe )
    ioe.printStackTrace();
finally
    try
        if ( input != null )
            input.close();
    catch ( Exception e )
        e.printStackTrace();
}As for how to parse the line of the file, I'll leave that to you for now. Are the three values delimited with any special characters?
jbisotti

NO clue about JAVA but need help please

I am cleaning up someone's else work who used to be employed here. I know ZIP about Java but am becoming more and more familiar with WAR files and deplying them with Jrun on an NT2K Server.So here is what I have. I have a deployed app from months ago. I have a new app to deploy. I did this successfully. I can access it, etc. But I am getting some SQL error.
Can anyone give me any idea what it could be? I have looked at my sqlcustomauthentication.java file and i have not anything to it. Why would something change on this when all I really did was re-deploy it.
Here is the error.
Thanks a TON!!
java.lang.NullPointerException:
     at allaire.jrun.security.SQLCustomAuthentication.getName(SQLCustomAuthentication.java:76)
     at jrun__members2ejspc._jspService(jrun__members2ejspc.java:62)
     at allaire.jrun.jsp.HttpJSPServlet.service(HttpJSPServlet.java:39)
     at allaire.jrun.jsp.JSPServlet.service(JSPServlet.java:228)
     at allaire.jrun.jsp.JSPServlet.service(JSPServlet.java:196)
     at allaire.jrun.servlet.JRunSE.service(JRunSE.java, Compiled Code)
     at allaire.jrun.session.JRunSessionService.service(JRunSessionService.java, Compiled Code)
     at allaire.jrun.servlet.JRunSE.runServlet(JRunSE.java, Compiled Code)
     at allaire.jrun.servlet.JRunRequestDispatcher.forward(JRunRequestDispatcher.java, Compiled Code)
     at allaire.jrun.servlet.JRunSE.service(JRunSE.java, Compiled Code)
     at allaire.jrun.servlet.JRunSE.service(JRunSE.java, Compiled Code)
     at allaire.jrun.servlet.JvmContext.dispatch(JvmContext.java, Compiled Code)
     at allaire.jrun.jrpp.ProxyEndpoint.run(ProxyEndpoint.java, Compiled Code)
     at allaire.jrun.ThreadPool.run(ThreadPool.java, Compiled Code)
     at allaire.jrun.WorkerThread.run(WorkerThread.java, Compiled Code)

It looks like maybe you are having a problem in the way you are accessing the authentication on your db. From the error message, I would say the name field needed to log in is never being set

Image size and mime type.. non-java guy needs help

Image size, mime type.. non-java guy needs help
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ImageInfo test = new ImageInfo();
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can anyone please help me out to modify the above so I can also print the mime type and the file size to screen.
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http://support.apple.com/kb/HT5818
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‘iPad is disabled’ fix without resetting using iTunes
Today I met my match with an iPad that had a passcode entered too many times, resulting in it displaying the message ‘iPad is disabled – Connect to iTunes’. This was a student iPad and since they use Notability for most of their work there was a chance that her files were not all backed up to the cloud. I really wanted to just re-activate the iPad instead of totally resetting it back to our default image.
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~~~~~~~~~~~~~
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 Cheers, Tom

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puis lancez la recherche.
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Pour moi il est temps de dormir.
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iMac 21”5, i7, 2.8 GHz, 4 Gbytes, 1 Tbytes, mac OS X 10.6.8 and 10.7.2
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Contact iTunes
Contact iTunes

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http://support.apple.com/kb/ht5624
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Java student needs help please.

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