How to get datas from List Object Java

Question

I m new in Java and have a problem with showing data from a list of objects  I have a simple method  which should collect data across multiple tables and return it to my controller    public List lt Object gt  getHouseInfo    Query q   em createNativeQuery  SELECT houses id  addresses country  addresses region  house details rooms  house details square FROM houses  addresses  house details    List lt Object gt  myList   q getResultList     return myList     Now I want to get this data in controller  but I don t know how to get single results from the list  I tried to do something like this    List lt Object gt  list   getHouseInfo    for  int i 0  i lt list size  i     System out println  Element   i list get 0       but I m getting only references to this objects  for example  Ljava lang Object  167a47b   I also tried to use Iterator  but the result is the same  I tried to use a code like this    List lt Object gt  list   getHouseInfo    for  int i 0  i lt list size  i     System out println  Element   i list get 0  0       but it doesn t help me too - this ends with a compile error   Can someone tell me how to get an  id  integer value  from this list  I m using MyFaces in my  View  where I have a code like this  houseControll is the name of my JSF Managed Bean - the controller      lt t dataList id  myDataList  value    houseControll fullOffer   var  element  rows  3   gt       lt t outputText id  houseId  value    element 0     gt       lt  t dataList gt    this code shows an  id  value properly - I have 1 2 3     values  How can I get the same result in my controller  How to print the data in controller

User · Answer

Thanks All for your responses  Good solution was to use  brain s  method    List lt Object gt  list   getHouseInfo    for  int i 0  i lt list size  i     Object   row    Object    list get i   System out println  Element   i Arrays toString row        Problem solved  Thanks again

User · Answer

For starters you aren t iterating over the result list properly  you are not using the index i at all  Try something like this   List lt Object gt  list   getHouseInfo    for  int i 0  i lt list size  i        System out println  Element   i list get i        It looks like the query reutrns a List of Arrays of Objects  because Arrays are not proper objects that override toString you need to do a cast first and then use Arrays toString      List lt Object gt  list   getHouseInfo    for  int i 0  i lt list size  i        Object   row    Object    list get i      System out println  Element   i Arrays toString row

User · Answer

You should try something like this  List xx   List  list get 0  String id    String  xx get 0    or if you have a House value object the result of the query is of the same type  then  House myhouse    House  list get 0

User · Answer

System out println  Element   i list get 0       Should be  System out println  Element   i list get i       To use the JSF tags  you give the dataList value attribute a reference to your list of elements  and the var attribute is a local name for each element of that list in turn  Inside the dataList  you use properties of the object  getters  to output the information about that individual object    lt t dataList id  myDataList  value    houseControlList   var  element  rows  3   gt       lt t outputText id  houseId  value    element houseId    gt       lt  t dataList gt

User · Answer

Do like this  List lt Object   gt  list   HQL list       get your lsit here but in Object array   your query is    SELECT houses id  addresses country  addresses region       for Object   obj   list   String houseId   String valueOf obj 0       houseId is at first place in your query String country   String valueof obj 1       country is at second and so on                 this way you can get the mixed objects with ease  but you should know in advance at which place what value you are getting or you can just check by printing the values to know  sorry for the bad english I hope this help

[java] How to get datas from List<Object> (Java)?

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