Add hashmap in to hashmap as avalue

In the below code, am creating a temp hashmap and adding it as value to another hashmap, at the end of the while loop the csvList hashmap has only the last value of the temp has map that was added as a value, all other values are null

The key is retained and all values are replaced by null.
What am i doing wrong here, is it the temp.clear or where the temp hashmap is declared.

HashMap<String, HashMap<String, String>> csvList = new HashMap<String, HashMap<String, String>>();



HashMap<String, String> tempMap = new HashMap<String, String>();

List<String> line = null;

try {

    inputStream = new FileInputStream(csvFile);



    //scanner = new Scanner(inputStream);

    scanner = new Scanner(inputStream, "UTF-8");

    //scanner.useDelimiter("rn");



    int i = 0;

    while (scanner.hasNext()) {

        //tempMap.clear();

        if (i == 0) {

            headList = parseLine(scanner.nextLine());

            i++;

        } else {

            line = parseLine(scanner.nextLine());

            pKey = "";



            for (int j = 0; j < line.size(); j++) {

                if (!selectClause.toLowerCase().contains(headList.get(j).toLowerCase()))

                    continue;

                else {

                    // Change for multiple PKeys

                    if (primaryKey.toLowerCase().contains(headList.get(j).toLowerCase())) {

                        pKey = pKey + line.get(j);

                    }

                    if (headList.get(j).equalsIgnoreCase(primaryKey))

                        pKey = line.get(j);

                    tempMap.put(headList.get(j).toLowerCase(), line.get(j));

                }

            }

            //System.out.println(i++);

            line.clear();

            csvList.put(pKey, tempMap);

        }

        //tempMap.clear();



    }

    headList.clear();

    //tempMap.clear();

    scanner.close();

    }



    return csvList;

}

edited Nov 27 '18 at 12:34

Rakesh

9241617

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

add a comment |

The key is retained and all values are replaced by null.
What am i doing wrong here, is it the temp.clear or where the temp hashmap is declared.

HashMap<String, HashMap<String, String>> csvList = new HashMap<String, HashMap<String, String>>();



HashMap<String, String> tempMap = new HashMap<String, String>();

List<String> line = null;

try {

    inputStream = new FileInputStream(csvFile);



    //scanner = new Scanner(inputStream);

    scanner = new Scanner(inputStream, "UTF-8");

    //scanner.useDelimiter("rn");



    int i = 0;

    while (scanner.hasNext()) {

        //tempMap.clear();

        if (i == 0) {

            headList = parseLine(scanner.nextLine());

            i++;

        } else {

            line = parseLine(scanner.nextLine());

            pKey = "";



            for (int j = 0; j < line.size(); j++) {

                if (!selectClause.toLowerCase().contains(headList.get(j).toLowerCase()))

                    continue;

                else {

                    // Change for multiple PKeys

                    if (primaryKey.toLowerCase().contains(headList.get(j).toLowerCase())) {

                        pKey = pKey + line.get(j);

                    }

                    if (headList.get(j).equalsIgnoreCase(primaryKey))

                        pKey = line.get(j);

                    tempMap.put(headList.get(j).toLowerCase(), line.get(j));

                }

            }

            //System.out.println(i++);

            line.clear();

            csvList.put(pKey, tempMap);

        }

        //tempMap.clear();



    }

    headList.clear();

    //tempMap.clear();

    scanner.close();

    }



    return csvList;

}

edited Nov 27 '18 at 12:34

Rakesh

9241617

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

add a comment |

The key is retained and all values are replaced by null.
What am i doing wrong here, is it the temp.clear or where the temp hashmap is declared.

HashMap<String, HashMap<String, String>> csvList = new HashMap<String, HashMap<String, String>>();



HashMap<String, String> tempMap = new HashMap<String, String>();

List<String> line = null;

try {

    inputStream = new FileInputStream(csvFile);



    //scanner = new Scanner(inputStream);

    scanner = new Scanner(inputStream, "UTF-8");

    //scanner.useDelimiter("rn");



    int i = 0;

    while (scanner.hasNext()) {

        //tempMap.clear();

        if (i == 0) {

            headList = parseLine(scanner.nextLine());

            i++;

        } else {

            line = parseLine(scanner.nextLine());

            pKey = "";



            for (int j = 0; j < line.size(); j++) {

                if (!selectClause.toLowerCase().contains(headList.get(j).toLowerCase()))

                    continue;

                else {

                    // Change for multiple PKeys

                    if (primaryKey.toLowerCase().contains(headList.get(j).toLowerCase())) {

                        pKey = pKey + line.get(j);

                    }

                    if (headList.get(j).equalsIgnoreCase(primaryKey))

                        pKey = line.get(j);

                    tempMap.put(headList.get(j).toLowerCase(), line.get(j));

                }

            }

            //System.out.println(i++);

            line.clear();

            csvList.put(pKey, tempMap);

        }

        //tempMap.clear();



    }

    headList.clear();

    //tempMap.clear();

    scanner.close();

    }



    return csvList;

}

edited Nov 27 '18 at 12:34

Rakesh

9241617

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

The key is retained and all values are replaced by null.
What am i doing wrong here, is it the temp.clear or where the temp hashmap is declared.

HashMap<String, HashMap<String, String>> csvList = new HashMap<String, HashMap<String, String>>();



HashMap<String, String> tempMap = new HashMap<String, String>();

List<String> line = null;

try {

    inputStream = new FileInputStream(csvFile);



    //scanner = new Scanner(inputStream);

    scanner = new Scanner(inputStream, "UTF-8");

    //scanner.useDelimiter("rn");



    int i = 0;

    while (scanner.hasNext()) {

        //tempMap.clear();

        if (i == 0) {

            headList = parseLine(scanner.nextLine());

            i++;

        } else {

            line = parseLine(scanner.nextLine());

            pKey = "";



            for (int j = 0; j < line.size(); j++) {

                if (!selectClause.toLowerCase().contains(headList.get(j).toLowerCase()))

                    continue;

                else {

                    // Change for multiple PKeys

                    if (primaryKey.toLowerCase().contains(headList.get(j).toLowerCase())) {

                        pKey = pKey + line.get(j);

                    }

                    if (headList.get(j).equalsIgnoreCase(primaryKey))

                        pKey = line.get(j);

                    tempMap.put(headList.get(j).toLowerCase(), line.get(j));

                }

            }

            //System.out.println(i++);

            line.clear();

            csvList.put(pKey, tempMap);

        }

        //tempMap.clear();



    }

    headList.clear();

    //tempMap.clear();

    scanner.close();

    }



    return csvList;

}

java hashmap

edited Nov 27 '18 at 12:34

Rakesh

9241617

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

edited Nov 27 '18 at 12:34

Rakesh

9241617

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

edited Nov 27 '18 at 12:34

Rakesh

9241617

edited Nov 27 '18 at 12:34

Rakesh

9241617

edited Nov 27 '18 at 12:34

Rakesh

9241617

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

asked Nov 27 '18 at 12:20

Divya Neelaiah

2915

add a comment |

1 Answer
1

active

oldest

votes

You create the tempMap outside the while loop so it is the same instance you use all the time, move the creation inside the loop so each pKey in the csvList gets a unique instance

while (scanner.hasNext()) {

    HashMap<String, String> tempMap = new HashMap<String, String>();

    ...

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

add a comment |

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1 Answer
1

active

oldest

votes

1 Answer
1

active

oldest

votes

You create the tempMap outside the while loop so it is the same instance you use all the time, move the creation inside the loop so each pKey in the csvList gets a unique instance

while (scanner.hasNext()) {

    HashMap<String, String> tempMap = new HashMap<String, String>();

    ...

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

add a comment |

You create the tempMap outside the while loop so it is the same instance you use all the time, move the creation inside the loop so each pKey in the csvList gets a unique instance

while (scanner.hasNext()) {

    HashMap<String, String> tempMap = new HashMap<String, String>();

    ...

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

add a comment |

You create the tempMap outside the while loop so it is the same instance you use all the time, move the creation inside the loop so each pKey in the csvList gets a unique instance

while (scanner.hasNext()) {

    HashMap<String, String> tempMap = new HashMap<String, String>();

    ...

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

You create the tempMap outside the while loop so it is the same instance you use all the time, move the creation inside the loop so each pKey in the csvList gets a unique instance

while (scanner.hasNext()) {

    HashMap<String, String> tempMap = new HashMap<String, String>();

    ...

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

answered Nov 27 '18 at 12:43

Joakim Danielson

9,3573724

add a comment |

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