Sorting multiple strings into an element

The way you are doing it is a little bit complicated (sorry I didn't even read the hole code).

From the output you are wanting to have, this is how I would do it:

I would use a Map which has as key the name without the the part after the underscore and as value a List of values.

I.e.:

When you read a line starting with Name extract that name from the line and remove the part after the the underscore (including). Save that name in variable whitch remains persistent through the loops.

When you read a line starting with Value extract the value again and look up the corresponding List from the Map using the name you have saved before. If the List does not exist, then create one and put it into the Map. Then add the value into the List.

Here is how it looks like:

private Map<String, List<String>> readValues(BufferedReader reader) throws IOException {
    Map<String, List<String>> nameToValuesMap  = new HashMap<String, List<String>>();
    String line = null;
    String actName = null; 
    while((line = reader.readLine()) != null) {
        if(line.startsWith("Name")) {
            String[] split = line.split("\\s*=\\s*", 2);
            String name = split[1];
            int i = name.indexOf('_');
            if(i != -1) {
                name = name.substring(0, i);
            }
            actName = name;
        } else if(line.startsWith("Value")) {
            String[] split = line.split("\\s*=\\s*", 2);
            String value = split[1].replace("0x", "");
            if(actName != null) {
                List<String> values = nameToValuesMap.get(actName);
                if(values == null) {
                    values = new ArrayList<String>();
                    nameToValuesMap.put(actName, values);
                }
                values.add(value);
            }
        }
    }

    return nameToValuesMap;
}

And for some testing I used the sample text you have posted:

@Test
public void readpartValues() throws IOException {
    String fielData = "[Device|EEP_FEATUREKOI_HFS_Max|Kostia]\r\n" + 
            "--------------------------------\r\n" + 
            "Name(1) = partHeader_A01\r\n" + 
            "Value(1) = 0x10\r\n" + 
            "Desc(1) = (Address 0x000) Article No. / P.C.B No Byte 1\r\n" + 
            "Name(2) = partHeader_A02\r\n" + 
            "Value(2) = 0x9\r\n" + 
            "Desc(2) = (Address 0x001) Article No. / P.C.B No Byte 2\r\n" + 
            "Name(3) = partHeader_A03\r\n" + 
            "Value(3) = 0x95\r\n" + 
            "Desc(3) = (Address 0x002) Article No. / P.C.B No Byte 3\r\n" + 
            "Name(4) = partHeader_A04\r\n" + 
            "Value(4) = 0x38\r\n" + 
            "Desc(4) = (Address 0x003) Article No. / P.C.B No Byte 4\r\n" + 
            "----------------------------------\r\n" + 
            "Name(12) = AdrIctPcbTestDate_Day\r\n" + 
            "Value(12) = 0xFF\r\n" + 
            "Desc(12) = (Address 0x00B) Test Date : Day\r\n" + 
            "---------------------------------\r\n" + 
            "Name(13) = AdrIctPcbTestDate_Month\r\n" + 
            "Value(13) = 0xFF\r\n" + 
            "Desc(13) = (Address 0x00C) Test Date : Month\r\n" + 
            "---------------------------------\r\n" + 
            "Name(14) = AdrIctPcbTestTime_Hour\r\n" + 
            "Value(14) = 0xFF\r\n" + 
            "Desc(14) = (Address 0x00D) Test Time : Hour\r\n" + 
            "---------------------------------\r\n" + 
            "Name(15) = AdrIctPcbTesTime_Minute\r\n" + 
            "Value(15) = 0xFF\r\n" + 
            "Desc(15) = (Address 0x00E) Test Time : Minute";


    BufferedReader reader = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(fielData.getBytes())));

    Map<String, List<String>> nameToValuesMap  = readValues(reader);
    reader.close();

    List<String> partHeaderValues = nameToValuesMap.get("partHeader");
    System.out.println("partHeader = " + partHeaderValues.toString());

    List<String> adrIctPcbTestTimeValues = nameToValuesMap.get("AdrIctPcbTestTime");
    System.out.println("AdrIctPcbTestTime = " + adrIctPcbTestTimeValues.toString());
}

Output

partHeader = [10, 9, 95, 38]
AdrIctPcbTestTime = [FF]

Hope this helps!