Answer Posted / azad bajaj

Almost all the methods in the Vector class are synchronized.
All the methods which either change (read or write) the
values, or change the size or the change the capacity of
the vector.
example method:

public synchronized void setElementAt(E obj, int index) {
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException
(index + " >= " + elementCount);
}
elementData[index] = obj;
}

or

public synchronized void removeElementAt(int index) {
modCount++;
if (index >= elementCount) {
throw new ArrayIndexOutOfBoundsException
(index + " >= " +

elementCount);
}
else if (index < 0) {
throw new ArrayIndexOutOfBoundsException
(index);
}
int j = elementCount - index - 1;
if (j > 0) {
System.arraycopy(elementData, index + 1,
elementData, index, j);
}
elementCount--;
elementData[elementCount] = null; /* to let gc
do its work */
}

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