package com.tutego.insel.solutions.lang;
class FrequenzKonvertierung
{
  static String onlyNumbers( String s )
  {
    StringBuffer sb = new StringBuffer();
    for( int i = 0; i < s.length(); i++ ) {
      char c = s.charAt( i );
      if( ( (c >= '1') && (c <= '9') ) || ( (c >= '+') && (c <= '.') ) )
        sb.append( c );
    }
    return sb.toString();
  }
  
  public static double toFrequence( String s ) {
    return stringDoubleToDouble( onlyNumbers( s ) );
  }

  public static double stringDoubleToDouble( String s ) {
    String doubleString = s.replace( ',', '.' );
    return Double.parseDouble( doubleString );
  }
  
  public static void main( String args[] ) {
    System.out.println( toFrequence( "Hallo hier ist 1,2345 was los!!" ) );

  }
}