CODEWITHSUNDEEP
javaswingdocumentjtextfieldjformattedtextfield
anas Tasya
anas Tasya

Reputation: 3

how to manipulate jtextfield return type?

I have a jtext field

when user type a number like

123456789,10

it will automatic set in jtextfield

123,456,789.10

then if user click a button it will

System.out.print( the_same_number );

that will result

123456789.10

(should i use formatted field in this case?)

thanks..

Upvotes: 0

Views: 459

Answers (3)

Robin
Robin

Reputation: 36601

You can opt for the DocumentFilter as suggested by @MadProgrammer. However, it will be difficult to tackle the requirement to have a different display in the text field and when printing to console (it will require some extra manual parsing/formatting).

Combined with the requirement to accept only numbers I would strongly suggest to look at the JFormattedTextField in combination with a NumberFormat.

  • The JFormattedTextField will only accept input that can be parsed by the NumberFormat (you can type invalid input, but it will never be accepted)
  • The actual value (JFormattedTextField#getValue) will be a Double (if you choose the correct format), so you can print it perfectly

Note that the standard JFormattedTextField has some usability issues. With a bit of googling you can find different improved version of the JFormattedTextField. For example this one where I find the only missing thing is visual feedback when the input is invalid (e.g. make the background red)

Upvotes: 1

MadProgrammer
MadProgrammer

Reputation: 347184

You will want to use a DocumentFilter to filter the input coming into the text field.

Check out MDP's Examples which actually has an example of the question you are asking

Upvotes: 2

static void main
static void main

Reputation: 738

"how to make jtextfield only accept input number and dot (.) and coma (,)?"

    @Override
    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if ((e.KeyChar >= 48 && e.KeyChar <= 57) || e.KeyChar == 46 || e.KeyChar == 44){
        }
        else{
        }
    }

Upvotes: 0

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