How to get a list of specific fields values from objects stored in a list?

Question

Say I have an list of objects with two fields field1 and field2, both of String type.

How do I get a list of all field1 values wit

Answer 1

Yes!! Its possible. But you have to do some crooked work.

1. Create a inner class with required variables. Eg: here am going to use 2 variables.( TNAME and TABTYPE).

    public class storeTables {
           private String tablename = "";
           private String tabletype = "";
           public storeTables(String a, String b)
           {
               this.setTablename(a);
               this.setTabletype(b);
           }
           public void setTablename(String tablename) {
               this.tablename = tablename;
           }
           public String getTablename() {
               return tablename;
           }
           public void setTabletype(String tabletype) {
               this.tabletype = tabletype;
           }
           public String getTabletype() {
               return tabletype;
           }}
   

2. Create a List of the inner class created above and dont forget to encapsulate it.

   private List objlist= new ArrayList();
   

3. Get the value stored to the list as a inner class object.

   String Query="SELECT * FROM TAB";
   while(rs.next())
   {
   String tname=rs.getString("TNAME");
   String tabtype=rs.getString("TABTYPE");
   getObjlist().add(new storeTables(tname,tabtype));
           }
   

4. create a DATAMODEL and push the list to the datamodel

   private DataModel selectableItems= new ListDataModel(objlist);
   

5. get the warpped data to another list.

   List items= (List)selectableItems.getWrappedData();
   

6. Finally!!! printing the data.

   for(storeTables item:items){
   System.out.println(item.getTablename());
       }
   

TADA !!!! it will print only the tablename and not the tabtype ;) Believe that there is nothing impossible in java Any doubts!!