Return the String value from Array List

Question

I am trying to reform/reconstruct the string values from list. I am reading values from a text file. values in text file like below format.

    H|013450107776|10/15/2019
    D|TXN001|10/15/2019|013450107806|LCUATADA05|1000.00|PAYMENT FOR SERVICE|Successful
    D|TXN002|10/15/2019|013458001581|LCUATADA04|1500.00|INVOICE 001|Successful
    D|TXN003|10/15/2019|013450107784|LCUATADA01|1750.00|SEPT PAYMENT|Successful
    H|007442500211|11/05/2019
    D|1000000489|007442500211|0009204332|85585.44|SEPT PAYMENT|Successful
    H|007442500213|11/05/2019
    D|1000000489|007442500211|0009204332|85585.44|SEPT PAYMENT|Successful
    D|1000000490|007442500211|0009204332|85585.44|SEPT PAYMENT|Successful
    D|1000000491|007442500211|0009204332|85585.44|SEPT PAYMENT|Successful

find below code for reading file.

 public Integer  readFile(String fileName,String path){  
        List<String> lineList = new ArrayList<>();
        try {
            reader = new BufferedReader(new FileReader(
                    path+"/"+fileName));
            String line = reader.readLine();
            count =0;
            while (line != null) {
                lineList.add(line);
                count ++;
                line = reader.readLine();
            }
            reader.close();
        } catch (IOException e) {
        }
        String packet=searchHeader(lineList);
        try{
            unmarshallResponsePacket(packet); 
        }catch(Exception e){
        }
        return count;
    }

lineList contains values like

[ H|013450107776|10/15/2019,D|TXN001|10/15/2019|013450107806|LCUATADA05|1000.00|PAYMENT FOR SERVICE|Successful,D|TXN002|10/15/2019|013450107806|LCUATADA05|1000.00|PAYMENT FOR SERVICE|Successful,D|TXN002|10/15/2019|013458001581|LCUATADA04|1500.00|INVOICE 001|Successful, D|TXN003|10/15/2019|013450107784|LCUATADA01|1750.00|SEPT PAYMENT|Successful,H|007442500211|11/05/2019,D|1000000489|007442500211|0009204332|85585.44|SEPTPAYMENT|Successful...] 


  How i can form the string value(header information followed by detail 
  information) like
 "H|013450207776|10/15/2019
  D|0000TXN001|10/15/2019|013450107806|LCUATADA05|1000.00|PAYMENT FOR 
  SERVICE|Successful" from the List

Vadiraj · Accepted Answer · 2019-11-14 08:50:59Z

1

using below code i resolved the issue.

private static String packetList(List<String> oldPacketList) {
        StringBuffer sb3 = new StringBuffer();

        String header="" ;  

        for(int i = 0; i < oldPacketList.size(); i++) {
            if(oldPacketList.get(i).startsWith("H")) {
                headertest=oldPacketList.get(i);
                continue;
            }
            else {
                sb3.append(header.trim().toString()+(System.getProperty("line.separator")));
                sb3.append(oldPacketList.get(i).trim().toString()+(System.getProperty("line.separator")));


            }
        }

        System.out.println("----------------output--------------------");

        return sb3.toString().trim();
    }

answered Nov 14, 2019 at 8:50

Vadiraj

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