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Help you with what? If you think someone is going to write the code for you then I'm afraid you are in the wrong forum. Since chat room software seems to be the commonest project for new developers I suggest you try a Google search for samples and articles.
Veni, vidi, abiit domum
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sushilshukla wrote: Plz help me
1. Decide what the application will do, specifically how the user will interact with it (what they will 'see' and what they 'do')
2. Learn the basics of a programming language
3. Learn the basics of network protocols.
4. Learn how to program network communication in the language you are using.
5. Learn how to interact with the user in the language.
6. Put all of the above together to create an application
7. Test 6, and fix problems until it works meeting the goals of 1.
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Here is the code I tried to add up all values of JTable column but not working properly!
int row =jTable1.getRowCount();
int sum=0;
for (int i = 0; i < row; i++){
sum+= Integer.parseInt(jTable1.getValueAt(i, 5).toString());
}
String totalResult = Integer.toString(sum);
txtTotal.setText(totalResult);
The values to add up are in 5th column! Thanks!!!
-- modified 23-Nov-13 4:01am.
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Cyber12 wrote: but not working properly!
Well I have Googled that, but didn't find anything; maybe you could try explaining what it means.
sum+= Integer.parseInt(jTable1.getValueAt(i, 5).toString());
Why are you converting a value to a string just so you can parse it back to a value?
Veni, vidi, abiit domum
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Because the syntax didn't allow me to write without converting to string! Can fix it removing the .toString(); if it is possible!!!
Or I need an other alternative code if possible? Thanks!
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Well you neeed to figure it out based on what object type is held in that cell.
Veni, vidi, abiit domum
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The type of object held in that cell(column) is integer or double.
Thanks!!!
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So all you need to do is add them all together, right? You really need to think a bit more about exactly what you are trying to do here, and explain it in proper detail. Telling us that a column can hold an integer or real number is not particualrly useful, as it tells us nothing about what your actual problem is.
Veni, vidi, abiit domum
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I have Tested the code to add up all double values in one column! And The Error is: java.lang.NullPointerException, Pointing to the the line of code: sum+=Double.parseDouble(tblviewTaxDetails.getValueAt(i,5).toString());
Please help modifying it!!! Thanks!!
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Cyber12 wrote: The Error is: java.lang.NullPointerException
Which means that you are tring to refer to an item by an invalid reference. You should try to break the offending statement into its constituent parts and then use your debugger to find out why you have a NULL pointer in there. In the above case something like:
Double dblValue = tblviewTaxDetails.getValueAt(i,5);
sum += dblValue;
Understanding what NullPointerExceptions are, what can cause them and how to avoid them, will make your life considerably easier.
Veni, vidi, abiit domum
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Thanks!!! Problem Solved!!! It was because of the number of rows in the JTable!!!! It must be equal to the number of values to be summed up!!! My JTable initially had 100 rows, I tried it adjusting the number of rows equal to the number of records displayed in the JTable! It's now working properly! Thanks!
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What will be the default value of indexes when i create
char[] ch = new char[50];
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What indexes are you talking about?
Veni, vidi, abiit domum
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such as index ch[5] ... i just want to know is null="" ???
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What happens when you try it, or use your debugger to check?
Veni, vidi, abiit domum
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i have to write junit testcases using annotation for spring application can anyone suggest link or tutorial to me.
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 that search even me also did.but i didnt get propely how to do with annotations
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I have a form in which I have made File no field which hold the Integer value like 1-2-3-4 and so on.
I want that ,when I save a form which has file no 1 ,and then after when I want to save the next record it should remember the last file no and increment by 1.
I have not coded yet anything because I don't know if it is possible?
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chdboy wrote: I don't know if it is possible?
It definitely is possible. You just need to use a variable to hold the value, and use that to display in the field. Every time you save a file, increment the value and refresh the displayed field.
Veni, vidi, abiit domum
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thanks for the Idea I'm working on it.
EDIT:
I managed to do what I wanted BUT...
It only happens till the application is open and I'm saving data one after one...as soon as I close to application and opens in again I have see the last file no and enter the next file no manually.
with this code
String filenostr = filenotxtfield.getText();
statement.setString(1,filenostr);
int fileno=Integer.parseInt(filenostr);
fileno++;
String convertno=String.valueOf(fileno);
filenotxtfield.setText(convertno);
statement.executeUpdate();
int rowsAffected = statement.executeUpdate();
if(rowsAffected > 0)
{
JOptionPane.showMessageDialog(null, "Data Inserted successfully!");
}
else
{
JOptionPane.showMessageDialog(null, "Data is not Inserted!", "Not successfully", JOptionPane.ERROR_MESSAGE);
}
statement.close();
con.close();
Addition to that I'm getting error on line
int rowsAffected = statement.executeUpdate();
ERROR:
com.microsoft.sqlserver.jdbc.SQLServerException: Violation of PRIMARY KEY constraint 'PK__Employer__6F09E6800F975522'. Cannot insert duplicate key in object 'dbo.Employer'.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:216)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1515)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(SQLServerPreparedStatement.java:404)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.doExecute(SQLServerPreparedStatement.java:350)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:5696)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1715)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeCommand(SQLServerStatement.java:180)
at com.microsoft.sqlserver.jdbc.SQLServerStatement.executeStatement(SQLServerStatement.java:155)
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.executeUpdate(SQLServerPreparedStatement.java:314)
But as I see in my Management Studio that the data has been saved.but still getting this error ..why?
modified 22-Nov-13 1:08am.
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I'm able to display the value after data is saved, but it is showing me wrong value with this code.
int fileno1=Integer.parseInt(Result.getString(2));
int increment = ++fileno1;
String convertno1=String.valueOf(increment);
filenotxtfield.setText(convertno1);
If 1 and 2 file no already exists after entering 3rd number manually and then save it ,it is showing me 2 not 4.?
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