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Object Oriented Programming :: Could anyone help with this error...VB.Net2003

Author: shyguyjeff
Subject: Could anyone help with this error...VB.Net2003
Posted: Fri Jul 06, 2007 1:36 am (GMT -4)
Topic Replies: 0

I used vb.net2003 and using Microsoft SQL Server 7. The error and my code goes like this: [/

Quote:
An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in system.data.dll Additional information: System error.

Code:
Dim strDrvLicNbr As String = txtDrvLicNbr.Text Dim strFullName As String = txtFullName.Text If strDrvLicNbr = "" Then MsgBox("You must provide the customer's driver's license number") Exit Sub End If If strFullName = "" Then MsgBox("You must provide the customer's name") Exit Sub End If Dim strInsert As String = "INSERT INTO Customers VALUES('" & _ strDrvLicNbr & "','" & strFullName & "', " & " , '" & txtDLClass.Text & _ "', '" & dtpDateIssue.Value & "', '" & _ dtpExpDate.Value & "', '" & txtFullName.Text & _ "', '" & txtAddress.Text & "', '" & _ txtCity.Text & "', & '" & txtZIPCode.Text & _ txtHomePhone.Text & "', '" & chkOrganDonor.Checked & "')" Dim conDatabase As SqlConnection = New _ SqlConnection("Data Source=(local);Database='CCR';Integrated Security=yes") Dim cmdDatabase As SqlCommand = New SqlCommand(strInsert, conDatabase) conDatabase.Open() cmdDatabase.ExecuteNonQuery() conDatabase.Close()

Code:

   Dim strDrvLicNbr As String = txtDrvLicNbr.Text
   Dim strFullName As String = txtFullName.Text

   If strDrvLicNbr = "" Then
   MsgBox("You must provide the customer's driver's license number")
   Exit Sub
   End If
   If strFullName = "" Then
   MsgBox("You must provide the customer's name")
   Exit Sub
   End If

   Dim strInsert As String = "INSERT INTO Customers VALUES('" & _
   strDrvLicNbr & "','" & strFullName & "', " & " , '" & txtDLClass.Text & _
   "', '" & dtpDateIssue.Value & "', '" & _
   dtpExpDate.Value & "', '" & txtFullName.Text & _
   "', '" & txtAddress.Text & "', '" & _
   txtCity.Text & "', & '" & txtZIPCode.Text & _
   txtHomePhone.Text & "', '" & chkOrganDonor.Checked & "')"

   Dim conDatabase As SqlConnection = New _
   SqlConnection("Data Source=(local);Database='CCR';Integrated Security=yes")
   Dim cmdDatabase As SqlCommand = New SqlCommand(strInsert, conDatabase)

   conDatabase.Open()

   cmdDatabase.ExecuteNonQuery()
   conDatabase.Close()

[/quote][/list]

Object Oriented Programming :: Need help in my VB.net

Author: shyguyjeff
Subject: Need help in my VB.net
Posted: Thu Jul 05, 2007 9:06 pm (GMT -4)
Topic Replies: 0

Hello there...I just want to know where is the best site where I can download complete tutorials in vb.net2003 and I am using Microsoft SQL Server and Crystal Report in Generating Reports...Thanks in advance for those who view and replying my message.

Object Oriented Programming :: VB.NET - Type Excel.Application is not defined error

Author: daremedy
Subject: VB.NET - Type Excel.Application is not defined error
Posted: Mon Dec 18, 2006 2:51 pm (GMT -4)
Topic Replies: 0

Trying to work with:

Code:
Dim ExcelVar As New Excel.Application

gave that error. The solution is as follows...

Click the Project menu option
Click Add Reference
Click on the COM tab
Locate Microsoft Excel Object Library 10.0 (or whatever version you need/have) and highlight it
Click on the Select button
Click on OK

Now your code should work just fine.... I hope :S[/list]
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Object Oriented Programming :: RE: Finding duplicates in Excel

Author: dietnkzg
Posted: Fri Nov 24, 2006 10:03 am (GMT -4)
Topic Replies: 1

You know what, no matter what kind of record system you use, whether it be a database, spreadsheet or whatever, its always good to know how to find a duplicate. Always!
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Object Oriented Programming :: Finding duplicates in Excel

Author: daremedy
Subject: Finding duplicates in Excel
Posted: Wed Nov 22, 2006 10:50 am (GMT -4)
Topic Replies: 1

I had to wrap my head around this one this morning. Here's how it goes... Assuming the sheet looks like this:

Code:
-------------------------------------------- Column A -------------------------------------------- AAA BBB CCC AAA BBB CCC AAA

Enter the following formula into Column B...

Code:
=IF(COUNTIF($A$1:A1,A1)>1,"Duplicate","Unique")

Then just copy that cell down and any duplicates will be marked with the word Duplicate, and Unique ones will be marked with the word Unique. Good times.
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Object Oriented Programming :: RE: Submitting PDF files to an FTP site

Author: daremedy
Posted: Fri Aug 04, 2006 9:58 am (GMT -4)
Topic Replies: 1

Just a quick note, for those wanting to find out how to do the script for this, check out my post [ here ] to get a head start.
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Object Oriented Programming :: Submitting PDF files to an FTP site

Author: daremedy
Subject: Submitting PDF files to an FTP site
Posted: Fri Aug 04, 2006 9:56 am (GMT -4)
Topic Replies: 1

I recently got the task of figuring out how the Adobe Designer software allows you to submit a file to an FTP site. I figured, hell, should be easy enough, right? Adobe claims to have support for this feature on their site. After a few feable attempts at making it work, I went to the net. Oddly enough, it was extremely hard to find any support or documentation on HOW to submit a PDF file (or data) to an FTP site. And would'nt you know it, you CANT!!!! Well, you can, but its not as easy as Adobe makes it seem. You have to send the data to a script first, that parses the information, then saves it to a file, then using a script, FTP the document to wherever you want it to be stored. Adobe LIES!! Their features for Adobe Designer are misleading. In researching, here's someone's approach to how the FTP fiasco works:

Quote:
Submit PDF files to an FTP site David R Reid - 08:45am Feb 21, 2006 Pacific I've seen lots of talk and confusion on this forum about how to submit data and/or files. I have what I thought was a fairly simple issue, but have been battling it for over a week -- please help! I've created the desired fillable PDF form and added a Submit button. When the user clicks the Submit button, I'd like for a copy of the filled PDF file to be placed on/saved to the FTP server. I've got the format of the URL (ftp://username:password@ftp.mycorp.com) in the URL field, but when the user clicks submit, IE opens the folder on the FTP server rather than submitting the file. A - Is what I want to do even possible for users who my only have Adobe Reader? B - If this is possible, then what am I doing wrong? Thanks!

Quote:

Submit PDF files to an FTP site

David R Reid - 08:45am Feb 21, 2006 Pacific

I've seen lots of talk and confusion on this forum about how to submit data and/or files. I have what I thought was a fairly simple issue, but have been battling it for over a week -- please help!

I've created the desired fillable PDF form and added a Submit button. When the user clicks the Submit button, I'd like for a copy of the filled PDF file to be placed on/saved to the FTP server. I've got the format of the URL (ftp://username:password@ftp.mycorp.com) in the URL field, but when the user clicks submit, IE opens the folder on the FTP server rather than submitting the file.

A - Is what I want to do even possible for users who my only have Adobe Reader?

B - If this is possible, then what am I doing wrong?

Thanks!

Quote:
Chris Trubiani - 8:53am Feb 21, 06 PST (#1 of 4) You can't do this. The submit happens over HTTP, not FTP. If you specify a URL to an FTP site IE will open the site, but it has no idea that it needs to send commands after that to actual start the transfer. You'd have to submit via HTTP to a server side component (ie: servlet or something like that) and write code to transfer the file to the FTP site. Also, if you're submitting the whole PDF, and not just the data then it won't work for users who just have Reader. Chris Adobe Enterprise Developer Support

Quote:

Chris Trubiani - 8:53am Feb 21, 06 PST (#1 of 4)

You can't do this. The submit happens over HTTP, not FTP. If you specify a URL to an FTP site IE will open the site, but it has no idea that it needs to send commands after that to actual start the transfer. You'd have to submit via HTTP to a server side component (ie: servlet or something like that) and write code to transfer the file to the FTP site.

Also, if you're submitting the whole PDF, and not just the data then it won't work for users who just have Reader.

Chris
Adobe Enterprise Developer Support

Quote:
David R Reid - 9:25am Feb 21, 06 PST (#2 of 4) Here's an excerpt from Adobe LiveCycle Designer Help: # In the Object palette, click the Submit tab. Select one of these formats from the Submit Format list: XML Data Package (XDP) # PDF # XML Data (XML) # URL-Encoded Data (HTTP Post) So there must be a way to submit PDF files to a server. What do I need on the server side to be able to accept PDF files sent to a URL via the Submit mechanism and have them ? I don't need blow-by-blow instructions; if you please point me in the right direction I'd appreciate it. ps - I hope Adobe recognizes from the volume of questions similar to mine on this forum that not only is the product literature for Adobe Professional 7.0 misleading regarding the ability and relative ease of submitting PDF data/files, but the product documentation is woefully inadequate and confusing. To say that this product doesn't live up to the user's expectations would be a gross understatement. Don't get me wrong, I'm a C++/Assembler developer with 25 years of experience. I'll get this to work no matter what it takes. However, I pity any non-software developers who purchased Adobe Professional 7.0 thinking that they'd be able to easily create and distribute user-fillable forms that are universally functional for all users. Source: http://www.adobeforums.com/cgi-bin/webx/.3bbe9e1a

Quote:

David R Reid - 9:25am Feb 21, 06 PST (#2 of 4)

Here's an excerpt from Adobe LiveCycle Designer Help:

# In the Object palette, click the Submit tab. Select one of these formats from the Submit Format list: XML Data Package (XDP)
# PDF
# XML Data (XML)
# URL-Encoded Data (HTTP Post)

So there must be a way to submit PDF files to a server. What do I need on the server side to be able to accept PDF files sent to a URL via the Submit mechanism and have them ? I don't need blow-by-blow instructions; if you please point me in the right direction I'd appreciate it.

ps - I hope Adobe recognizes from the volume of questions similar to mine on this forum that not only is the product literature for Adobe Professional 7.0 misleading regarding the ability and relative ease of submitting PDF data/files, but the product documentation is woefully inadequate and confusing. To say that this product doesn't live up to the user's expectations would be a gross understatement. Don't get me wrong, I'm a C++/Assembler developer with 25 years of experience. I'll get this to work no matter what it takes. However, I pity any non-software developers who purchased Adobe Professional 7.0 thinking that they'd be able to easily create and distribute user-fillable forms that are universally functional for all users.

Source: http://www.adobeforums.com/cgi-bin/webx/.3bbe9e1a

So yes indeed, Adobe lies. I just thought I'd throw that out there. That being said, Adobe Photoshop rules, and thats no lie.
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Object Oriented Programming :: RE: Distributed .NET: Learn The ABCs Of Programming Windows Com

Author: dietnkzg
Posted: Fri Jul 21, 2006 11:44 pm (GMT -4)
Topic Replies: 2

WTF?
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Object Oriented Programming :: RE: Distributed .NET: Learn The ABCs Of Programming Windows Com

Author: jessplaycam
Posted: Sun Jul 16, 2006 8:29 pm (GMT -4)
Topic Replies: 2

word

Object Oriented Programming :: RE: java practice stuff

Author: daremedy
Posted: Mon Apr 24, 2006 7:31 pm (GMT -4)
Topic Replies: 13

Which part of the we dont do homework comment didnt you get? This isnt your code, its sample code. I've coded the game of life before, making an interface is the easiest part of the project. Post some of your work and you might get help.
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Object Oriented Programming :: RE: java practice stuff

Author: leroyharvey126
Posted: Sun Apr 23, 2006 8:07 pm (GMT -4)
Topic Replies: 13

Revise your Game of Life program to have a nice user interface where you can enter the initial neighborhood and the number of generations to display and a graphical display of the neighborhood.

import java.util.*;

/**
* Example solution for Project 8.2 Game of Life
*/
public class GameOfLife
{
public static void main(String[] args)
{
//instance variables
Scanner in = new Scanner(System.in);
int size = 0, row=0, column = 0;
int numberStart = 0;
int numGen=10;

// Use the book example for a test case
/* size = 10;
numberStart = 5;
Grid g = new Grid(size);
g.setCell(1,2);
g.setCell(2,3);
g.setCell(3,1);
g.setCell(3,2);
g.setCell(3,3);
*/
// get the user to input the size of the square grid and number of cells to start

System.out.println("Enter the width of cells in the grid");
size= in.nextInt();
System.out.println("Enter the number of living cells to start");
numberStart= in.nextInt();

// test to be sure the number of cells is reasonable
while (numberStart==0 || numberStart>(size*size))
{
System.out.println("Starting number must be more than zero and less than");
System.out.println("the maximum number of cells, please try again");
numberStart= in.nextInt();

}

// create and populate the grid
Grid g = new Grid(size);

for (int i= 0; i<numberStart; i++)
{ System.out.println ("Enter the row and column of a living cell");
row = in.nextInt();
column = in.nextInt();
g.setCell(row,column);
}

// draw the initial grid
System.out.println("Generation 0");
System.out.print(g.toString());

// calculates and prints out the next 10 generations
for (int i=1; i<=numGen; i++)
{
g.generation();
System.out.println("\nGeneration "+i);
System.out.print(g.toString());
}

}
}

import java.util.*;

// This class Grid creates the grid for the game of life.
public class Grid
{
// instance variables
private int size;
public String[][] grid;

// Constructor for objects of class Grid
public Grid (int s)
{
// initialise instance variables
size=s;
grid = new String[size][size];

// set the grid to all empty spaces
for (int i = 0; i<size; i++)
for(int j = 0 ; j<size; j++)
grid[i][j]=" ";

}
// set a living cell
public void setCell(int row, int column)
{
grid[row][column] = "*";
}

// form an appropriate String to display the grid
public String toString()
{
String t="";
for (int i= 0; i<size; i++)
{
t=t+"|";
for (int j=0; j<size; j++)
t=t+grid[i][j];
t=t+"|\n";
}
return t;
}

// one way to count the neighbors
// you can also augment the array to have an extra row top and bottom
// and an extra column left and right -- and then move the game grid
// over 1 column and down 1 row and count neighbors from 1 to size+1
public int countNeighbors(int r, int c)
{
int neighbors = 0;
if (r == 0) // special case of the top row
{ if (c==0) // the 0,0 cell's neighbors
{ if (grid[r][c+1] == "*") neighbors++;
if (grid[r+1][c+1] == "*") neighbors++;
if (grid[r+1][c] == "*") neighbors++;
}
else if (c==size-1) // the 0,size-1 neighbors
{ if (grid[r][c-1] == "*") neighbors++;
if (grid[r+1][c-1] == "*") neighbors++;
if (grid[r+1][c] == "*") neighbors++;
}
else // the row 0, cells 1 to size-2 neighbors
{ if (grid[r][c-1] == "*") neighbors++;
if (grid[r+1][c-1] == "*") neighbors++;
if (grid[r+1][c] == "*") neighbors++;
if (grid[r][c+1] == "*") neighbors++;
if (grid[r+1][c+1] == "*") neighbors++;

}
}
else if (r == size-1) // special case of the bottom row
{ if (c==0) // the size-1,0 cell's neighbors
{ if (grid[r ][c+1] == "*") neighbors++;
if (grid[r-1][c+1] == "*") neighbors++;
if (grid[r-1][c ] == "*") neighbors++;
}
else if (c==size-1) // the 0,size-1 neighbors
{ if (grid[r ][c-1] == "*") neighbors++;
if (grid[r-1][c-1] == "*") neighbors++;
if (grid[r-1][c ] == "*") neighbors++;
}
else // the row 0, cells 1 to size-2 neighbors
{ if (grid[r ][c-1] == "*") neighbors++;
if (grid[r-1][c-1] == "*") neighbors++;
if (grid[r-1][c ] == "*") neighbors++;
if (grid[r ][c+1] == "*") neighbors++;
if (grid[r-1][c+1] == "*") neighbors++;
}
}
else if (c == 0) // special case of the left column from row 1 to size-2
{
if (grid[r-1][c ] == "*") neighbors++;
if (grid[r-1][c+1] == "*") neighbors++;
if (grid[r ][c+1] == "*") neighbors++;
if (grid[r+1][c ] == "*") neighbors++;
if (grid[r+1][c+1] == "*") neighbors++;
}
else if (c == size-1) // special case of the right column from row 1 to size-2
{
if (grid[r-1][c ] == "*") neighbors++;
if (grid[r-1][c-1] == "*") neighbors++;
if (grid[r ][c-1] == "*") neighbors++;
if (grid[r+1][c ] == "*") neighbors++;
if (grid[r+1][c-1] == "*") neighbors++;
}
else
{ // check the 8 neighbors
if (grid[r-1][c-1]=="*") neighbors++;
if (grid[r-1][c ]=="*") neighbors++;
if (grid[r-1][c+1]=="*") neighbors++;
if (grid[r ][c-1]=="*") neighbors++;
if (grid[r ][c+1]=="*") neighbors++;
if (grid[r+1][c-1]=="*") neighbors++;
if (grid[r+1][c ]=="*") neighbors++;
if (grid[r+1][c+1]=="*") neighbors++;
}
return neighbors;
}

// Count neighbors and compute next generation
public void generation()
{
int[][] neighborGrid= new int [size][size];

for (int i=0; i<size; i++)
for (int j=0; j<size; j++)
neighborGrid[i][j] = countNeighbors(i,j);

// next generation
for (int i = 0; i<size; i++)
for(int j = 0 ; j<size; j++)
// die of loneliness (0,1) or overcrowding (4+)
if (neighborGrid[i][j]<=1 || neighborGrid[i][j] >=4)
grid[i][j]=" ";
// be born (3)
else if (neighborGrid[i][j]==3)
grid[i][j]="*";
// remain
else
grid[i][j]=grid[i][j];

}

}

There are my two programs does anyone have any idea what I need to do next.

Object Oriented Programming :: RE: java practice stuff

Author: daremedy
Posted: Sat Apr 08, 2006 2:28 pm (GMT -4)
Topic Replies: 13

Sorry, I dont do homework. If you posted some of your work, then maybe I could help.
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Object Oriented Programming :: RE: java practice stuff

Author: leroyharvey126
Subject: Here's the one I'm working on now you have already done it.
Posted: Mon Apr 03, 2006 12:29 pm (GMT -4)
Topic Replies: 13

Testing

1. Testing a class for run-time errors in the context of an ongoing project is always difficult. The source of an error may be obscured by other phenomena, there could be more than one error and it might arise under unusual circumstances or even appear to go away. Testing a new class in isolation, before adding it to a project, gives you an excellent opportunity to locate errors before they become lost in a broken project.

Testing in isolation is called unit testing. It requires a test harness, that is, a class that calls your methods with parameters obtained from 1) user input, 2) a file, or 3) a program that automatically generates parameter values.

You will write two test stubs for the following class. The first test stub takes test values from prompted user input. The second test stub generates test cases randomly.

public class Finder
{
/**
Constructs a finder that finds substrings in a given string.
@param aString the string to analyze
*/
public Finder(String aString)
{
s = aString;
}

/**
Search for a substring.
@param sub the string to look for
@return if found, the integer position of sub in the string
else, -1
*/
public int findFirst(String sub)
{
int i = 0;

while (sub.length() + i <= s.length())
{
if(s.substring(i, i + sub.length()).equals(sub))
return i;
else
i++;
}
return -1;
}

private String s;
}

First, provide a test harness that prompts the user for test cases.

It is tedious to type in lots of test data every time you find a bug in your code. How can you reduce your workload?

2. Provide a test harness for randomly generated test cases.

When generating test cases randomly, be sure to include positive and negative tests.

Hint: We have no function to generate a completely random string, but you can write one. Make a string of the 26 lowercase letters, then extract single-character length substrings from it at positions generated by generator.nextInt(26) and concatenate them.

Did you think of boundary cases? What are the boundary cases in this example?

Implementing an Interface

3. The Comparable interface is a commonly used interface in Java. Look up the Comparable interface in the API documentation.
If you wanted to modify the BankAccount class so that it implements the Comparable<BankAccount> interface, what method(s) do you need to implement?

Give the method signatures, that is, the return type(s), the method name(s), and the method parameter(s).

The compareTo method compares two parameters, the implicit and explicit parameter. The call

a.compareTo(b)

returns

� 1 if a is larger than b

� -1 if a is smaller than b

� 0 if a and b are the same

Implement the compareTo method of the BankAccount class so that it compares the balances of the accounts. Some of the code has been provided for you:

public class BankAccount implements Comparable<BankAccount>
{
. . .

/**
Compares two bank accounts.
@param other the other BankAccount
@return 1 if this bank account has a greater balance than the other one,
-1 if this bank account is has a smaller balance than the other one,
and 0 if both bank accounts have the same balance
*/
public int compareTo(BankAccount other)
{
. . .
}

private double balance;
}

4. The sort method of the Collections class can sort a list of objects of classes that implement the Comparable interface.

Here is the outline of the required code.

import java.util.ArrayList;
import java.util.Collections;
. . .

// put bank accounts into a list
ArrayList<BankAccount> list = new ArrayList<BankAccount>();
list.add(ba1);
list.add(ba2);
list.add(ba3);

// call the library sort method
Collections.sort(list);

// print out the sorted list
for (BankAccount b : list)
System.out.println(b.getBalance());

Using this outline, write a test program that sorts a list of five bank accounts.

What is the outcome of executing your test program? Remember that you must use the version of the BankAccount class that implements the Comparable interface.

Change your compareTo method by switching the return values 1 and -1. Recompile and run the test program again. What is the outcome of executing your test program? Explain the changed output.
Event Handling

5. A timer notifies a listener at regular time intervals. The time interval is given in milliseconds. The listener must implement the ActionListener interface.

For example, the call

Timer t = new Timer(1000, listener);
t.start();

causes the timer to call the actionPerformed method once per second.

To see the timer at work, install a listener that simply prints out the current time. To print out the current time call

import java.util.Date;
. . .
System.out.println(new Date());

Supply a class CurrentTimePrinter that implements the ActionListener interface and whose actionPerformed method prints the current time.

What is the code for the CurrentTimePrinter class?

Now put together a test program that prints the current time once each second.

Construct a CurrentTimePrinter, construct and start a timer, and put up a message dialog so that the program user can quit the program.

JOptionPane.showMessageDialog(null, "Quit?");
System.exit(0);

6. The program of the preceding exercise keeps printing the time, once per second. In this exercise, you will modify the program so that it stops the timer after 15 seconds, restarts it after another 15 seconds, stops it after a further 15 seconds, and so on.

Of course, we will use a second timer for this purpose. Here is the implementation:

class TimerToggler implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
if (t.isRunning())
t.stop();
else
t.restart();
}
}

ActionListener listener2 = new TimerToggler();
Timer t2 = new Timer(15000, listener2);

t2.start();

Add the code that defines t2 after the instruction for starting t and before displaying the option pane. Compile the code.

What compiler error do you get? Why? What can you do to avoid it?

Fix your program so that the first timer is declared as final. Methods of inner classes can access only final local variables of the enclosing method.

Your program should now compile and run. Execute it for approximately one minute. What output do you get?

7. It is a nuisance that the user must stop the program by clicking a button. Solve that problem by automatically stopping the program after two minutes (or 120,000 milliseconds). Simply make a timer listener that calls System.exit(0) in the actionPerformed method of its action listener.

Write the code for the third timer.

Now add the code for your third timer to the program and remove the last two lines of main, that is, the message dialog display and the call to System.exit(0).

Compile your program and run it.

Does it work as expected? If not, why?

The program exited immediately when exiting main, so the timers never ran.

To keep main alive, you'll need to add the message dialog back in. Simply add the line

JOptionPane.showMessageDialog(null, "Please wait");

to the end of main.

Now the program will run for two minutes, and then exit. What output do you get?

Object Oriented Programming :: RE: java practice stuff

Author: leroyharvey126
Subject: Need Some Help?
Posted: Mon Apr 03, 2006 12:21 pm (GMT -4)
Topic Replies: 13

I'm in a java concepts course right now and I've pretty well so far (B+) but now that it is getting close to the end of the semester the course is becoming rather challenging I was wondering if you could look at some of my labs give me a little help thanks.

Object Oriented Programming :: RE: Is C++ a widely used program?

Author: daremedy
Posted: Thu Mar 30, 2006 7:22 pm (GMT -4)
Topic Replies: 1

Concentrate on C and Java. C++ is a great language, but if you look at the job market, most people want C or Java, and a lot are actually transitioning to the .NET era, so you should get comfortable with C#, J# and all of those Microsoft languages. Its hard to say what language to focus more on, it really depends on where you're headed in life. A few years ago I was all about C and Java until I learned about PHP. Now I'm stronger in PHP than I am in C, but I know enough that I can get back into coding C or Java pretty easily. Learn all the language, get familiar with them, its never a bad thing. But if one language interests you more than others, by all means explore and get stronger.
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