Java: Add HashMap to ArrayList for Talend












2














I am using Talend tJavaFlex component where there is start code(runs once in the beginning), main code(runs for every row), end code(runs once at end).



**In the start code(create an empty list):**

java.util.List sharedList=new java.util.ArrayList<>(); 



**In the main code(create HashMap for each row and add to list):**

Consider each row has fields: startId, endID, time, flag.



sharedList.add(new java.util.HashMap<String, String>("startId",row1.startId));

<I am not sure how to handle this part>



**In end code(expose the list to other components)**

System.out.print(sharedList.size());


Could you suggest how to create HashMap for each row and add to list.






java







share|improve this question



























    2














    I am using Talend tJavaFlex component where there is start code(runs once in the beginning), main code(runs for every row), end code(runs once at end).



    **In the start code(create an empty list):**
    
java.util.List sharedList=new java.util.ArrayList<>(); 
    

    
**In the main code(create HashMap for each row and add to list):**
    
Consider each row has fields: startId, endID, time, flag.
    

    
sharedList.add(new java.util.HashMap<String, String>("startId",row1.startId));
    
<I am not sure how to handle this part>
    

    
**In end code(expose the list to other components)**
    
System.out.print(sharedList.size());


    Could you suggest how to create HashMap for each row and add to list.






    java







    share|improve this question

























      2












      2








      2







      I am using Talend tJavaFlex component where there is start code(runs once in the beginning), main code(runs for every row), end code(runs once at end).



      **In the start code(create an empty list):**
      
java.util.List sharedList=new java.util.ArrayList<>(); 
      

      
**In the main code(create HashMap for each row and add to list):**
      
Consider each row has fields: startId, endID, time, flag.
      

      
sharedList.add(new java.util.HashMap<String, String>("startId",row1.startId));
      
<I am not sure how to handle this part>
      

      
**In end code(expose the list to other components)**
      
System.out.print(sharedList.size());


      Could you suggest how to create HashMap for each row and add to list.






      java







      share|improve this question













      I am using Talend tJavaFlex component where there is start code(runs once in the beginning), main code(runs for every row), end code(runs once at end).



      **In the start code(create an empty list):**
      
java.util.List sharedList=new java.util.ArrayList<>(); 
      

      
**In the main code(create HashMap for each row and add to list):**
      
Consider each row has fields: startId, endID, time, flag.
      

      
sharedList.add(new java.util.HashMap<String, String>("startId",row1.startId));
      
<I am not sure how to handle this part>
      

      
**In end code(expose the list to other components)**
      
System.out.print(sharedList.size());


      Could you suggest how to create HashMap for each row and add to list.






      java




      java






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 10 at 16:59









      Aavik

      233316




      233316
























          2 Answers
          2






          active

          oldest

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          1














          You need to correct your sharedList declaration from,



          java.util.List sharedList=new java.util.ArrayList<>();


          to



          java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>();


          And your main code should be written something like this,



          Map<String, String> rowDataMap = new HashMap<String, String>();
          
rowDataMap.put("startId",row1.startId);
          
rowDataMap.put("endID",row1.endID);
          
rowDataMap.put("time",row1.time);
          
rowDataMap.put("flag",row1.flag);
          
sharedList.add(rowDataMap);


          Let me know if this looks fine and/or if you have any other queries.






          share|improve this answer





















          • Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
            – Aavik
            Nov 10 at 20:13












          • Yes this is how you need to declare your sharedList object where you want to store all Map entries.
            – Pushpesh Kumar Rajwanshi
            Nov 10 at 20:14










          • Thanks. Let me try this at office. The software is in office desktop.
            – Aavik
            Nov 10 at 20:17










          • Oh ok, sure. Let me know if you run into any issues further.
            – Pushpesh Kumar Rajwanshi
            Nov 10 at 20:18










          • Glad to help :)
            – Pushpesh Kumar Rajwanshi
            Nov 11 at 10:36



















          1














          You can create and initialize a HashMap and add it to a List at once like this,



          List list = new ArrayList();
          

          
list.add(new HashMap() {{
          
    put("a", "b");
          
}});





          share|improve this answer





















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            2 Answers
            2






            active

            oldest

            votes








            2 Answers
            2






            active

            oldest

            votes









            active

            oldest

            votes






            active

            oldest

            votes









            1














            You need to correct your sharedList declaration from,



            java.util.List sharedList=new java.util.ArrayList<>();


            to



            java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>();


            And your main code should be written something like this,



            Map<String, String> rowDataMap = new HashMap<String, String>();
            
rowDataMap.put("startId",row1.startId);
            
rowDataMap.put("endID",row1.endID);
            
rowDataMap.put("time",row1.time);
            
rowDataMap.put("flag",row1.flag);
            
sharedList.add(rowDataMap);


            Let me know if this looks fine and/or if you have any other queries.






            share|improve this answer





















            • Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
              – Aavik
              Nov 10 at 20:13












            • Yes this is how you need to declare your sharedList object where you want to store all Map entries.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:14










            • Thanks. Let me try this at office. The software is in office desktop.
              – Aavik
              Nov 10 at 20:17










            • Oh ok, sure. Let me know if you run into any issues further.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:18










            • Glad to help :)
              – Pushpesh Kumar Rajwanshi
              Nov 11 at 10:36
















            1














            You need to correct your sharedList declaration from,



            java.util.List sharedList=new java.util.ArrayList<>();


            to



            java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>();


            And your main code should be written something like this,



            Map<String, String> rowDataMap = new HashMap<String, String>();
            
rowDataMap.put("startId",row1.startId);
            
rowDataMap.put("endID",row1.endID);
            
rowDataMap.put("time",row1.time);
            
rowDataMap.put("flag",row1.flag);
            
sharedList.add(rowDataMap);


            Let me know if this looks fine and/or if you have any other queries.






            share|improve this answer





















            • Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
              – Aavik
              Nov 10 at 20:13












            • Yes this is how you need to declare your sharedList object where you want to store all Map entries.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:14










            • Thanks. Let me try this at office. The software is in office desktop.
              – Aavik
              Nov 10 at 20:17










            • Oh ok, sure. Let me know if you run into any issues further.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:18










            • Glad to help :)
              – Pushpesh Kumar Rajwanshi
              Nov 11 at 10:36














            1












            1








            1






            You need to correct your sharedList declaration from,



            java.util.List sharedList=new java.util.ArrayList<>();


            to



            java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>();


            And your main code should be written something like this,



            Map<String, String> rowDataMap = new HashMap<String, String>();
            
rowDataMap.put("startId",row1.startId);
            
rowDataMap.put("endID",row1.endID);
            
rowDataMap.put("time",row1.time);
            
rowDataMap.put("flag",row1.flag);
            
sharedList.add(rowDataMap);


            Let me know if this looks fine and/or if you have any other queries.






            share|improve this answer












            You need to correct your sharedList declaration from,



            java.util.List sharedList=new java.util.ArrayList<>();


            to



            java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>();


            And your main code should be written something like this,



            Map<String, String> rowDataMap = new HashMap<String, String>();
            
rowDataMap.put("startId",row1.startId);
            
rowDataMap.put("endID",row1.endID);
            
rowDataMap.put("time",row1.time);
            
rowDataMap.put("flag",row1.flag);
            
sharedList.add(rowDataMap);


            Let me know if this looks fine and/or if you have any other queries.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered Nov 10 at 17:06









            Pushpesh Kumar Rajwanshi

            4,7891826




            4,7891826












            • Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
              – Aavik
              Nov 10 at 20:13












            • Yes this is how you need to declare your sharedList object where you want to store all Map entries.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:14










            • Thanks. Let me try this at office. The software is in office desktop.
              – Aavik
              Nov 10 at 20:17










            • Oh ok, sure. Let me know if you run into any issues further.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:18










            • Glad to help :)
              – Pushpesh Kumar Rajwanshi
              Nov 11 at 10:36


















            • Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
              – Aavik
              Nov 10 at 20:13












            • Yes this is how you need to declare your sharedList object where you want to store all Map entries.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:14










            • Thanks. Let me try this at office. The software is in office desktop.
              – Aavik
              Nov 10 at 20:17










            • Oh ok, sure. Let me know if you run into any issues further.
              – Pushpesh Kumar Rajwanshi
              Nov 10 at 20:18










            • Glad to help :)
              – Pushpesh Kumar Rajwanshi
              Nov 11 at 10:36
















            Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
            – Aavik
            Nov 10 at 20:13






            Would this work ? java.util.List<Map<String, String>> sharedList=new java.util.ArrayList<Map<String, String>>(); sharedList.add(new java.util.HashMap() {{ put("startId",row1.startId); put("endID",row1.endID); put("time",row1.time); put("flag",row1.flag); }});
            – Aavik
            Nov 10 at 20:13














            Yes this is how you need to declare your sharedList object where you want to store all Map entries.
            – Pushpesh Kumar Rajwanshi
            Nov 10 at 20:14




            Yes this is how you need to declare your sharedList object where you want to store all Map entries.
            – Pushpesh Kumar Rajwanshi
            Nov 10 at 20:14












            Thanks. Let me try this at office. The software is in office desktop.
            – Aavik
            Nov 10 at 20:17




            Thanks. Let me try this at office. The software is in office desktop.
            – Aavik
            Nov 10 at 20:17












            Oh ok, sure. Let me know if you run into any issues further.
            – Pushpesh Kumar Rajwanshi
            Nov 10 at 20:18




            Oh ok, sure. Let me know if you run into any issues further.
            – Pushpesh Kumar Rajwanshi
            Nov 10 at 20:18












            Glad to help :)
            – Pushpesh Kumar Rajwanshi
            Nov 11 at 10:36




            Glad to help :)
            – Pushpesh Kumar Rajwanshi
            Nov 11 at 10:36













            1














            You can create and initialize a HashMap and add it to a List at once like this,



            List list = new ArrayList();
            

            
list.add(new HashMap() {{
            
    put("a", "b");
            
}});





            share|improve this answer


























              1














              You can create and initialize a HashMap and add it to a List at once like this,



              List list = new ArrayList();
              

              
list.add(new HashMap() {{
              
    put("a", "b");
              
}});





              share|improve this answer
























                1












                1








                1






                You can create and initialize a HashMap and add it to a List at once like this,



                List list = new ArrayList();
                

                
list.add(new HashMap() {{
                
    put("a", "b");
                
}});





                share|improve this answer












                You can create and initialize a HashMap and add it to a List at once like this,



                List list = new ArrayList();
                

                
list.add(new HashMap() {{
                
    put("a", "b");
                
}});






                share|improve this answer












                share|improve this answer



                share|improve this answer










                answered Nov 10 at 17:07









                Sand

                727112




                727112






























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