private void setHistoryData(){
        try {
            Share [] sharebuffer = super.getAvailableShare();
            for (int i = 0; i < sharebuffer.length; i++){
                List<Long> values = new ArrayList<Long>();
                BufferedReader in = new BufferedReader(new FileReader("../Java_Boersenmanager/data/" + sharebuffer[i].name));
                String file = "";
                String buffer = "";
                while(true){
                    buffer = in.readLine();
                    if(buffer == null)
                        break;
                    file = file + buffer + "\n";
                }
                String[] fileSplit = file.split("\n");
                for(int c = 0; c < fileSplit.length; c++){
                    values.add(Long.parseLong(fileSplit[c]));
                }
                historyData.put(sharebuffer[i].name, values);
                in.close();
            }
        } catch (IOException e){
            ;
        }
        
    }