Java静态ArrayList <Object> 消除问题

Question

I have static ArrayList<Batch> . i want to remove which object contain productcode

This is my Batch Entity

public class BatchControl implements Parcelable{
  private String productCode;
  private String lotNumber;
  private String batchSerialNumber;
  private double quantity   ;
  private int sequence;
  private String productName;
  private String type;
  //Setter & getter
 }

This is my removing object

  static ArrayList<String> lstString = new ArrayList<String>();
  for (Iterator<Batch> i = lstString.iterator(); i.hasNext(); ) {
        Batch value=(Batch )i.next();
        if(value.getSequence() == iVal) {
            lstString.remove(value);
        }
    }

iVal is Android TableLayout contain the row number.

        String number = txtNumber.getText().toString();
    iVal = Integer.parseInt(number);

But it didn't remove which object have iValue. Because of the resoan static arraylist so, each & every time when i remove size going to change.

Please help me out.

Thanks in advance.

Answer 1

您应该使用i.remove（），请参考http://docs.oracle.com/javase/1.4.2/docs/api/java/util/Iterator.html

Answer 2

When using an Iterator on a list, you can safely remove the current element (regarding position or index in the list) with Iterator.remove() .

for (Iterator<Batch> i = lstString.iterator(); i.hasNext(); ) {
    Batch value=(Batch )i.next();
    if(lstBatCtrl.get(k).getSequence() == iVal) {
        i.remove();
    }
}

Take into account that using remove() on a static List can yield to problems if there are concurrent modifications on the List . Citing Iterator.remove() 's javadoc:

The behavior of an iterator is unspecified if the underlying collection is modified while the iteration is in progress in any way other than by calling this method

Answer 3

Use the following code:

  for (Iterator<Batch> i = lstString.iterator(); i.hasNext(); ) {
        Batch value=(Batch )i.next();
        if(value.getSequence() == iVal) {
            i.remove();
        }
    }