jTextField validation for numbers and one decimal point?

Question

I need to set a jTextField to accept only numbers and one decimal point.Nothing else. Decimal point can\'t be typed more than once and no other characters are allowed. How c

Answer 1

char c=evt.getKeyChar();
if(!(Character.isDigit(c)||
    (c==KeyEvent.VK_BACK_SPACE)||c==KeyEvent.VK_DELETE||evt.getKeyChar() == '.')){
//  evt.getKeyChar() == '.' does accept point when jtextfield accepts decimal number
  evt.consume();
  getToolkit().beep();
}