Java Input Numbers

Question

I made a method to input numbers. But I want that input is numeric but a dot (.) Can still be entered. please my friend help me. Thanks

private void jTextField1KeyTyped(java.awt.event.KeyEvent evt) {                                     
    // TODO add your handling code here:
    FilterHanyaAngka(evt);
}

public void FilterHanyaAngka(java.awt.event.KeyEvent evt) {
    char c = evt.getKeyChar();
    if (!((Character.isDigit(c) || (c == KeyEvent.VK_BACK_SPACE) || (c == KeyEvent.VK_DELETE)))) {
            evt.consume();
    }
}

MadProgrammer · Accepted Answer · 2014-02-21 03:12:57Z

1

Don't use KeyListener to filter content to the a text component, you have no idea of knowing in what order the KeyListeners will be notified and the key stroke may already have being sent to the field before you.

Instead you should use a DocumentFilter

Take a look at Text Component Features, in particular Implementing a Document Filter and here for examples

In fact, I believe there is actually a numeric filter example listed there...

answered Feb 21, 2014 at 3:12

MadProgrammer

348k22 gold badges243 silver badges379 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Markus · Accepted Answer · 2014-02-21 09:58:24Z

0

You can use ASCII instead of the Character or KeyEvent class. Look at this:

public class ASCIITest {

public static void main(String[] args) {
    char c = '3';

    if ((c >= '0' && c <= '9') || c == '.') {
        //some code..
    }
}

}

For more information read about the ASCII chart

answered Feb 21, 2014 at 9:58

Markus

1,7811 gold badge23 silver badges43 bronze badges

Comments

nugrahaTeten · Accepted Answer · 2014-03-14 09:22:40Z

0

yes I've found the solution in my opinion

public void filterDesimal(java.awt.event.KeyEvent evt) {
    char ch = evt.getKeyChar();
    if (!((ch == '.') ||
            (ch ==  '0') ||
            (ch ==  '1') ||
            (ch ==  '2') ||
            (ch ==  '3') ||
            (ch ==  '4') ||
            (ch ==  '5')||
            (ch ==  '6') ||
            (ch ==  '7') ||
            (ch ==  '8') ||
            (ch ==  '9') ||
            (ch ==  ',') ||
            (ch ==  KeyEvent.VK_BACK_SPACE) ||
            (ch ==  KeyEvent.VK_DELETE)
            )){
        evt.consume();
    }
}

answered Mar 14, 2014 at 9:22

nugrahaTeten

491 silver badge8 bronze badges

Collectives™ on Stack Overflow

Java Input Numbers

3 Answers 3

Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related