void addDecimalPoint(){
  this.displayMode=DISPLAY_MODE.INPUT;
  if (this.clearOnNextDigit) {
    setDisplayString(EMPTY_STRING);
  }
  final String inputString=getDisplayString();
  if (inputString.indexOf(DOT_CHARACTER) < 0) {
    setDisplayString(inputString + DOT_CHARACTER);
  }
}

void addDecimalPoint ( ) { this . displayMode = DISPLAY_MODE . INPUT ; if ( this . clearOnNextDigit ) { setDisplayString ( EMPTY_STRING ) ; } final String inputString = getDisplayString ( ) ; if ( inputString . indexOf ( DOT_CHARACTER ) < 0 ) { setDisplayString ( inputString + DOT_CHARACTER ) ; } }
add a decimal point
