Examples of java.util.ConcurrentModificationException

java.util.ConcurrentModificationException
This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
For example, it is not generally permissible for one thread to modify a Collection while another thread is iterating over it. In general, the results of the iteration are undefined under these circumstances. Some Iterator implementations (including those of all the general purpose collection implementations provided by the JRE) may choose to throw this exception if this behavior is detected. Iterators that do this are known as fail-fast iterators, as they fail quickly and cleanly, rather that risking arbitrary, non-deterministic behavior at an undetermined time in the future.
Note that this exception does not always indicate that an object has been concurrently modified by a different thread. If a single thread issues a sequence of method invocations that violates the contract of an object, the object may throw this exception. For example, if a thread modifies a collection directly while it is iterating over the collection with a fail-fast iterator, the iterator will throw this exception.
Note that fail-fast behavior cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast operations throw ConcurrentModificationException on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: ConcurrentModificationException should be used only to detect bugs. @author Josh Bloch @version 1.20, 03/30/06 @see Collection @see Iterator @see ListIterator @see Vector @see LinkedList @see HashSet @see Hashtable @see TreeMap @see AbstractList @since 1.2


        public boolean retainAll(Collection c) {
            synchronized (CopyOnWriteArrayList.this) {
                Object[] array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                int fullLength = array.length;
                Object[] tmp = new Object[length];
                int retained = 0;
                for (int i = offset; i < offset + length; i++) {
                    Object o = array[i];

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        public void clear() {
            synchronized (CopyOnWriteArrayList.this) {
                Object[] array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                int fullLength = array.length;
                Object[] newarr = new Object[fullLength - length];
                int moved = fullLength - offset - length;
                if (offset > 0) System.arraycopy(array, 0, newarr, 0, offset);
                if (moved > 0)

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            Object[] array;
            int last;
            synchronized (CopyOnWriteArrayList.this) {
                array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                last = offset + length;
            }
            ListIterator itr = ((List) o).listIterator();
            int idx = offset;
            while (idx < last && itr.hasNext()) {

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            Object[] array;
            int last;
            synchronized (CopyOnWriteArrayList.this) {
                array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                last = offset + length;
            }
            for (int i = offset; i < last; i++) {
                Object o = array[i];
                hashCode = 31 * hashCode + (o == null ? 0 : o.hashCode());

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                    throw new IndexOutOfBoundsException("Index: " + index +
                        ", Size: " + length);
                }
                Object[] oldarr = getArray();
                if (oldarr != expectedArray)
                    throw new ConcurrentModificationException();
                int fullLength = oldarr.length;
                // piggyback the array bounds check
                Object oldVal = oldarr[offset + index];
                if (oldVal == element) {
                    setArray(oldarr);

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                    throw new IndexOutOfBoundsException("Index: " + index +
                        ", Size: " + length);
                }
                Object[] oldarr = getArray();
                if (oldarr != expectedArray)
                    throw new ConcurrentModificationException();
                int fullLength = oldarr.length;
                Object[] newarr = new Object[fullLength + 1];
                int pos = offset + index;
                int moved = fullLength - pos;
                System.arraycopy(oldarr, 0, newarr, 0, pos);

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                    throw new IndexOutOfBoundsException("Index: " + index +
                        ", Size: " + length);
                }
                Object[] array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                int fullLength = array.length;
                int pos = offset + index;
                Object result = array[pos];
                Object[] newarr = new Object[fullLength - 1];
                int moved = fullLength - pos - 1;

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        public ListIterator listIterator() {
            // must synchronize to atomically obtain the array and length
            synchronized (CopyOnWriteArrayList.this) {
                Object[] array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                return new COWSubIterator(array, offset, offset + length,
                    offset);
            }
        }

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                    throw new IndexOutOfBoundsException("Index: " + index +
                        ", Size: " + length);
                }
                Object[] array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                return new COWSubIterator(array, offset, offset + length,
                    offset + index);
            }
        }

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            Object[] array;
            int last;
            synchronized (CopyOnWriteArrayList.this) {
                array = getArray();
                if (array != expectedArray)
                    throw new ConcurrentModificationException();
                last = offset + length;
            }
            StringBuffer buf = new StringBuffer();
            buf.append('[');
            for (int i = offset; i < last; i++) {

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