Java

24-May-20 22:56

You need to use your debugger to step through the code in that method to find out which reference is null. It is not something that anyone here can do for you.

Message Closed

25-May-20 3:26

Member 14843091

25-May-20 3:26

Message Closed

modified 25-May-20 13:01pm.

Richard MacCutchan25-May-20 4:38

Re: plz, someone should help me to debug this error ...

25-May-20 4:38

You could find out at jdb - The Java Debugger[^]. And, depending on which IDE you are using, it may well be built in.

Richard Deeming27-May-20 1:08

Richard Deeming

27-May-20 1:08

But then he wouldn't be able to push his spam link to his article writing service. D'Oh! | :doh:

NB: The person you're replying to isn't the OP.

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

Re: plz, someone should help me to debug this error ...

Richard MacCutchan27-May-20 1:50

Re: Java 1st Year Project

27-May-20 1:50

Thanks, well spotted.

Java 1st Year Project

Member 1483530117-May-20 18:12

Member 14835301

17-May-20 18:12

We have been given a project for my ComSci class and I've done what i think is half, but got feedback today and it was devastating. I dont know what to do. The final hand in is on the 1st of June. Is there anyone willing to maybe help me write the code? The most complex coding knowledge needed is 2D arrays. I would really appreciate it

Richard MacCutchan17-May-20 21:05

Return negative number as 0

17-May-20 21:05

Sorry, this site does not provide code to order. For a start it does not help you to hand in work written by someone else. If you cannot understand your assignment then you need to go over your study and course notes a few more times. There is also lots of useful information and sample code at The Java™ Tutorials[^]

and180y17-May-20 3:38

17-May-20 3:38

Hi, first time posting so hopefully doing it correctly. I have used a form builder to build my forms but have run into a couple of issues with functionality. In the code/calculation below I need to be able to return the answer 0 if the answer is less than 0. I've searched loads to no avail so any help would be much appreciated. T.I.A.

$('form#Commission #Commission_On').formCalc(" Nett_Earnings -Actual_Takings >0==0",{ currency_format:true, mirror:'sfm_Commission_On_parsed'});

modified 17-May-20 10:15am.

Richard MacCutchan17-May-20 5:38

17-May-20 5:38

What language is that, it does not look much like Java? However assuming it is supposed to convert that string into an actual sum it does not look valid. In the expression Nett_Earnings -Actual_Takings >0==0, what is >0==0 supposed to mean?

and180y17-May-20 6:10

17-May-20 6:10

Thanks for answering, I just assumed it was Java as all the scripts are. >0==0 is just one of the ways I was trying to make it work from their info before they told me the form couldn't do the calculation.

Richard MacCutchan17-May-20 6:47

17-May-20 6:47

What is this code and where did you get it from? As I said it does not look anything like Java.

and180y17-May-20 6:55

17-May-20 6:55

Thanks for answering. The programme is called simfatic form maker.
This was their reply to my query
"Simfatic Forms calculation field can't handle multiple levels of variables. In this case, the user enters a variable that intern is a variable in the next step.
This form has to be hand coded with the help of a developer"

Here is the actual form I am trying to make work https://www.salonlogic.co.uk/forms/Commission/Commission.php[^]

Richard MacCutchan17-May-20 21:02

17-May-20 21:02

Sorry, but this has nothing to do with Java programming. You need to talk to the people who created this package for information.

and180y17-May-20 6:46

17-May-20 6:46

I have also tried it this way

$('form#Commission #Commission_On').formCalc(" Nett_Earnings -Actual_Takings >0?0",{ currency_format:true, mirror:'sfm_Commission_On_parsed'});

however that then means no output to the box at all.

Richard Deeming18-May-20 0:55

Richard Deeming

18-May-20 0:55

That is not Java; that is JavaScript.

Despite the similar names, they are two completely different languages.

There is a specific forum for JavaScript questions:
JavaScript Discussion Boards[^]

"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer

and180y18-May-20 1:44

18-May-20 1:44

Thanks for replying, I will ask in the correct place. Smile | :)

hashing assignment

Member 1483469916-May-20 20:43

Member 14834699

16-May-20 20:43

hi guys, I was wondering if someone could help me write a search function that looks for a string in a hashtable. iv been struggling with this part of my assignment. iv done all the inserts parts and hash function itself.

Richard MacCutchan16-May-20 21:34

16-May-20 21:34

You need to explain the problem in more detail. What is wrong with a simple loop that compares the search string with each item in a list?

Member 1483469916-May-20 22:25

Member 14834699

16-May-20 22:25

hi Richard,
thank you for replying. So the hash table implementation stores simple String data items, so we can only track if an item is in the data structure or not. The find function, determines if the string is in the data the hash table or not. The program loads the test dataset into the data structure, then performs find operations on all the test data items, followed by find operations on a disjoint set of unseen data items.

Iv been able to code the hash component, its just the search part that I'm not too sure of.

this is my hash function

Java

public int hash ( String s )
   {
      int sum = 0;
      
      for(int=0, i<s.length(); i++)
      {sum +=((int)string.charAt(i))%size;}

      return sum %size;
   }  
// return True if the hash table contains string s
   // return False if the hash table does not contain string s

my find function would resembles something along these lines.
   boolean find ( String s )
   {
      boolean found = false;
      int value = hashFunction(s, size);
      
      return found;
   }

modified 17-May-20 5:15am.

Richard MacCutchan16-May-20 23:17

16-May-20 23:17

As I suggested before, you just need a loop to compare your search value with all the ones already stored. If they are in an array or list then it is just a simple compare of each value. If they are in a database then it is a SQL SELECT statement.

Member 1483469916-May-20 23:43

Member 14834699

16-May-20 23:43

Thank you Richard, ill try that and see. since the size of the list is already known, im thinking of using a for loop. ill let you know how it goes.

Richard MacCutchan16-May-20 23:49