Avoid using java.util.Enumeration objects unless you want to hide data (in other words, to return an enumeration of the data instead of the data itself). Asking a vector or hash table for an Enumeration object is slow and creates unnecessary garbage. If another thread might modify the vector, synchronize the iteration. The Java® SE uses an Iterator object for similar operations, but Iterator objects are not available in the Java® ME.

for( int i = v.size() - 1; i >=0; --i ) {
o = v.elementAt( i );
...
}
synchronized( v ) {
for( int i = v.size() - 1; i >=0; --i ) {
o = v.elementAt( i );
...
}
}