textfield - in java Calculator what should be coding of decimal point button ,i want to check if there is already dot in string so else add a dot in string - 


if(!".".contains(jtextfield.gettext())) {     jtextfield.settext(jtextfield.gettext()+ ".");     jtextfield.setbackground(color.magenta); } else {     jtextfield.settext(jtextfield3.gettext());     jtextfield.setbackground(color.green); }


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