// For a set or list
for (Iterator it=collection.iterator();
it.hasNext(); ) {
Object element = it.next();
}
// For keys of a map
for (Iterator
it=map.keySet().iterator(); it.hasNext(); ) {
Object key = it.next();
}
// For values of a map
for (Iterator
it=map.values().iterator(); it.hasNext(); ) {
Object value = it.next();
}
// For both the keys and values of a map
for (Iterator
it=map.entrySet().iterator(); it.hasNext(); ) {
Map.Entry entry = (Map.Entry)it.next();
Object key = entry.getKey();
Object value = entry.getValue();
}
// Create an array containing the elements in a list
Object[] objectArray = list.toArray();
MyClass[] array =
(MyClass[])list.toArray(new MyClass[list.size()]);
// Create an array containing the
elements in a set
Object[] objectArray = set.toArray();
MyClass[] array =
(MyClass[])set.toArray(new MyClass[set.size()]);