Store an array in HashMap

Question

i m new to Java  How can i store an array of integers values in a HashMap  after that i write this HashMap in a txt file  but this isn t important at the moment  I can store single fields but not an array  Any ideas     public void salveazaObiectulCreat String caleSpreFisier         HashMap map   new HashMap         map put   Autorul  numelePrenumeleAutorului       map put   Denumirea cartii  denumireaCartii       map put   Culoarea cartii  culoareaCartii       map put   Genul cartii  gen       map put   Limba  limba       map put   Numarul de copii  numarulDeCopii       map put   Numarul de pagini  numarulDePagini       map put   Pretul cartii  pretulCartii      try           File file   new File caleSpreFisier            FileOutputStream f   new FileOutputStream file            ObjectOutputStream s   new ObjectOutputStream f                    s writeObject map          s close              catch Exception e               System out println  An exception has occured

User · Answer

You can store objects in a HashMap     HashMap lt String  Object gt  map   new HashMap lt String  Object gt      You ll just need to cast it back out correctly

User · Answer

Not sure of the exact question but is this what you are looking for   public class TestRun        public static void main String    args                 Map lt String  Integer   gt  prices   new HashMap lt String  Integer   gt              prices put  milk   new Integer    1  3  2            prices put  eggs   new Integer    1  1  2

User · Answer

Your life will be much easier if you can save a List as the value instead of an array in that Map

User · Answer

Yes  the Map interface will allow you to store Arrays as values   Here s a very simple example   int   val    1  2  3   Map lt String  int   gt  map   new HashMap lt String  int   gt     map put  KEY1   val     Also  depending on your use case you may want to look at the Multimap support offered by guava

User · Answer

HashMap lt String  List lt Integer gt  gt  map   new HashMap lt String  List lt Integer gt  gt     HashMap lt String  int   gt  map   new HashMap lt String  int   gt       pick one  for example  HashMap lt String  List lt Integer gt  gt  map   new HashMap lt String  List lt Integer gt  gt     map put  Something   new ArrayList lt Integer gt      for  int i 0 i lt numarulDeCopii  i          map get  Something   add coeficientUzura i         or just  HashMap lt String  int   gt  map   new HashMap lt String  int   gt     map put  Something   coeficientUzura

User · Answer

If you want to store multiple values for a key  if I understand you correctly   you could try a MultiHashMap  available in various libraries  not only commons-collections

[java] Store an array in HashMap

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