Problem in returning the object + reflection + hashMap + list

Question

Hi All,
i am very new to java forums...
i'm sorry to disturb you all.. i don't exaclty know how to raise a question in forums..
Here my query is ::::
i have xlsReader file,which will read the data from the xls file.
after reading it,i am adding the contents of the xls sheet in to a Arraylist.
then i've put the list contents in to an object array,
then i'm invoking the getter and setter method of the javabean class.
and i'm returning object,but object contains only the last data of the list,instead of whole contents in that object.
the code is here,where am returnung the object.
kindly do reply...
Thanks in advance...:)
public static Object setDynamicValue ( Method setter2, List columnData, Object obj2 , Method getter2 )
Object val2=null;
try {
for ( int i = 0 ; i < columnData.size() ; i++ ) {
Object obj[] =( Object [] )columnData.get(i);
for ( int j = 0; j < obj.length; j++) {
// System.out.println("column Data:pppp: :"+obj[j].toString());
setter2.invoke(obj2, new Object[] {obj[j].toString() });
val2 = getter2.invoke(obj2, new Object[0]);
//System.out.println("output:::"+val2.toString());
// return val2;
System.out.println("#########################");
}catch (IllegalAccessException e) {
System.out.println("IllegalAccessException came :::"+e);
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
System.out.println("IllegalArgumentException came :::"+e);
e.printStackTrace();
} catch (InvocationTargetException e) {
System.out.println("InvocationTargetException came :::"+e);
// TODO Auto-generated catch block
e.printStackTrace();
return val2;
here,we are returning the object val2 , but its printing only the last data of the list
Object o1 = setDynamicValue ( setter2, columnName ,columnData, obj2,getter2 );
System.out.println("lastvalue of the list :"+o1);
thanks...
plz reply..

Answer 1

You are getting only the last data of the list because you does not have any mechanism to hold other values.
Check inf your code your the following code in the inner for loop (loop with index j)
val2 = getter2.invoke(obj2, new Object[0]);
Even if you are capturing some value into val2, it gets replaced next time the body of for loop runs. This way you are getting only the last data.
If you want to capture all values use arraylist. Keep adding all values to arraylist and return it. While printing iterate over arraylist and print values.
This is not a problem related to reflection or hashMap. Just the logic you have written is incorrect.