Asking about a text file

Question

how can i read a list containing some records e.g.fahrenheit temperatures. from a text file already been saved and then using it to make some conversions and calculations like converting to centigrade .after that i must save the outputs to another text file ??
i know that is alot but can anybody help me with it ........

Answer 1

after the above you just need to search the string for 'end of line' and maybe a paramname/value seperator, sperate the values, make sure you dont forget to kill whitespaces, and put the values into a vector or array.
i prefer to read the file line by line with the DataInputStream.readline() command and extract the value line by line.
look at this, maybe you can use it with little modification:
     public PropertiesObject(String name, String path)
          this.name = name;
          this.path = path;
          // sign for linebreak - depends on platforms
          newline = System.getProperty("line.separator");
          // reference to the properties file
          PropertiesFile = new File(path+name+".properties");
          // vector to put the param/value pair-array in
          PropertiesSet = new Vector();
          System.out.println("Properties File wird angelegt: "+PropertiesFile);
          try
               //opening stream to file for read operations
               FileInputStream PropertiesFileInput = new FileInputStream(PropertiesFile);
               DataInputStream PropertiesDataInput = new DataInputStream(PropertiesFileInput);
               while (true)
                    //reading line after line of the properties file
                    String line = PropertiesDataInput.readLine();
                    if (line == null)
                         return;
                    //just making sure there are no whitespaces at the beginng or end of the line
                    line = cutSpaces(line);
                    if (line.length() > 0)
                         //$ indicates a param-name
                         if (line.startsWith("$"))
                              // array to store a param/value pair in
                              propvaluepair = new String[1][2];
                              //get the param-name
                              String parameter = line.substring(1, line.indexOf(separator)-1);
                              //just making sure there are no whitespaces at the beginng or end of the variable
                              parameter = cutSpaces(parameter);
                              //get the value
                              String value = line.substring(line.indexOf(separator)+1, line.length());
                              //just making sure there are no whitespaces at the beginng or end of the variable
                              value = cutSpaces(value);
                              //put the param-name and the value into an array
                              propvaluepair[0][0] = parameter;
                              propvaluepair[0][1] = value;
                              //and finaly put the array into the vector
                              PropertiesSet.addElement(propvaluepair);
          // error handlig
          catch (IOException e)
               System.out.println("ERROR occured while reading property file for: "+name);
               System.out.println("ERROR CODE: "+e);
               System.out.println("this is a serious error - the server must be stopped");
     }