Remove Object from ArrayList

Hi,
i want to remove an object from my ArrayList. The Array-List contains objects from a class like this:
public class Data {
     String id;
     String name;
     String data;
     //getters
     //setters
myArrayList.remove(myData);
This doesn't work! Why not? What is wrong?
Daniel

The ArrayList determines which element to delete by the equals() method. The default implementation of equals() tests for instance identity. So two instances of your class with absolutely identical data fields will not match! You probably just need to override the default equals() with a proper implementation and everything will work.

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Unable to remove object from arraylist

Hello,
I am trying to remove a few objects from an arraylist and it isnt happeneing in one loop :
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                         empVo = (EmpVO)colList.get(i);
                         if(empVo.getempName().trim().equalsIgnoreCase("A") ||empVo.getempName().trim().equalsIgnoreCase("B") ||empVo.getempName().trim().equalsIgnoreCase("C") )
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Edited by: Sarvananda on Sep 3, 2010 12:10 PM
Also, the exact test has names A to F. So say A, D and E will be deleted in the first loop, then I have to specifically sysout and see which ones were deleted and then write another loop for B,C and F. Ofcourse at the end A - F are removed. But why two loops for it

Encephalopathic wrote:
What if you do this using an iterator to remove items, or if you start from the top of the list and iterate down to the first item?thanks for your reply. I was just looking at the API, and stumbled on this :
The iterators returned by this class's iterator and listIterator methods are fail-fast: if the list is structurally modified at any time after the iterator is created, in any way except through the iterator's own remove or add methods, the iterator will throw a ConcurrentModificationException. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.Any pointers on where I could look or how I could I move from here ?
Another question I had was, there is no efficient way to 'move' objects in an arraylist (based on their indexes), isn't it ?
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UnsupportedOperationException Error while removing object from List

Hi,
I need to remove a set of objects from List if it contains similar objects as the other one.
Follwing is the code snippet of the above scenario...
List selectedPaxList = new ArrayList();
TreeSet seatAssignedPaxlist= new TreeSet();
selectedPaxList.add("1");
selectedPaxList.add("2");
selectedPaxList.add("3");
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java.lang.UnsupportedOperationException
at java.util.AbstractList.remove(AbstractList.java:167)
at java.util.AbstractList$Itr.remove(AbstractList.java:432)
at java.util.AbstractCollection.removeAll(AbstractCollection.java:351)
Plz... help me to resolve the issue

java.lang.UnsupportedOperationException
at
java.util.AbstractList.remove(AbstractList.java:167)
at
java.util.AbstractList$Itr.remove(AbstractList.java:43
2)
at
java.util.AbstractCollection.removeAll(AbstractCollect
ion.java:351)
That stack trace looks wrong to me.
ArrayList overrides the remove method, so it
shouldn't be using the method in AbstractList. That's what I thought, too. There is either something missing or it's not an ArrayList. In fact the javadoc of AbstractList.remove sais:
"This implementation always throws an UnsupportedOperationException."
So it really looks like another subclass is used.
Also
the object it is trying to remove is a list (from
your exmaple it should be a String)
I could be wrong.These are just the code references not the parameters, I think.
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Remove Object from ArrayList

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