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I am trying to get the value of the row selected in a Jtable but am so confused on how to implement the ListSelectionListener so that I can see what has been selected. I have gone to the java tutorial but i find it confusing. can anyone give me an example on how to create a ListSelectionListener and handle an event where a user selects a row?
am so confused on how to implement the ListSelectionListener
See: How to Write a List Selection Listener for a working example.
I have gone to the java tutorial but i find it confusing.
We don't know what you find confusing about the working example from the above tutorial. So why do you think any code we post would be any different? Unless you can state the exact problem you have (along with your SSCCE) we can't offer any more help.
Have a look at the code at;
http://www.coderanch.com/t/339330/GUI/java/values-selected-row-JTable
I think, it'll help you.
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Please explain me the differences over time and space complexities in java for user defined and predefined functions in java. examples like, linked list, list, stack class. please explain this with valid example.
thank you.
There is nothing special in predefined function over user defined. The only thing is predefined has been written by somebody else for you. It depends on algorithm.
Crap code/implementation runs in a crap way. Doesn't matter if its user created or system/API provided. example at a high level is EJBs vs Spring.
Good written code runs pretty and sleek. Again doesn't matter who the hell wrote it.
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How can i let user write only one number in text field? Other should be consume.
I have code for write number.
private boolean number(char zn){
if(zn>='0' && zn<='9')
return true;
return false;
}
You state that this is a Swing question, and so I assume that you are using a JTextField. If so, you have one of two possible solutions here:
Use a JFormattedTextField and use a MaskFormatter, something simple like "#" should probably work perfectly here.
Or get the JTextField's Document and set its DocumentFilter with one that restricts input to as you deserve it. I think that this would be unnecessarily complex for you, and I recommend the first option.
Check the tutorial on how to use JFormattedTextFields which you can find here: JFormattedTextField Tutorial. It will explain all of the above including how to use a mask formatter with JFormattedTextFields.
Also please check Jon Skeet's blog on Writing the Perfect Question. Writing questions on this and other sites is a learned skill which can get better with study and effort. The tips that this blog contains will help you so that you'll know what information to include in your question so that the volunteers helping you don't have to guess at things. They will appreciate it, and you'll likely get better and quicker answers.
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How can I perform a search in JTable?
My CSV file contains:
stdid 001
stdname monish
dob 03/5/1789
And similar records for the rest of the file. I am able to bind using CSV Parser and get data into JTable. I want to perform a search on it the table using input from a JTextField. How can I perform this?
You can use a RowFilter/RowSorter. You can read more at Sorting and Filtering from the How to use Tables tutorial.
You can can also see a working example in the question posted here.
The accepted answer also provides a solution for case-insensitive filtering, if you're interested in that functionality
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what is the way or logic to make code like java Editors do, the make keywords red and other statements black, i want to make the java code for it.any help will be appreciable.
Use JEditorPane. This is excellent tools to make your keyword color as well as HTML tags.
You need a component which shows HTML string. Some strings, which you consider "java keywords" are taking "blue keyword css style" and others ( static variables) bold style and so on. A long ways to do it, start with an open-source IDE and see it.
I guess they use an Abstract Syntax Tree.
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Still having some issues with my code. No errors this time, its just not functioning properly!
here's the code: http://pastebin.com/nm633L1v
What's not working (I think):
fileWriter
jTable
3rd Party Libraries:
OpenCSV
filechooser.FileFilter :
just going to remove this from my code. I do not think it is necessary any more.
fileWriter :
This may be a side effect of jTable not displaying the contents of the CSV file for editing, but it doesn't seem to save or update the file when the program calls on it.
jTable :
This was throwing all the errors earlier, and may be the REAL McFly for all my issues. Not displaying the input CSV file, or saving the contents of the Table if I do stick random junk in the columns.
I know that it is a bunch of different code issues, but it is the one problem for me right now before I move on or pass off the project to another person, so any help here would be greatly appreciated!
I am not going to go through all of your code. I just gave your FileFilter a quick look.Note that you can use a FileNameExtensionFilter instead of implementing your own.
Although I must admit that your implementation looks correct to me. Unfortunately the code where you set the filter on the file chooser is not shown.