public static <T> T getRandomElement(final Set<T> collection) {
if (collection == null || collection.size() == 0) {
return null;
}
final int elemIndex = MathUtil.randomInteger(collection.size());
int i = -1;
for (final T elem : collection) {
if (++i == elemIndex) {
return elem;
}
}
return collection.iterator().next();
}
public static <T> T getRandomElement(final T[] collection) {
if (collection == null || collection.length == 0) {
return null;
}
return collection[MathUtil.randomInteger(collection.length)];
}
public static <T> T getRandomElement(final List<T> collection) {
if (collection == null || collection.size() == 0) {
return null;
}
return collection.get(MathUtil.randomInteger(collection.size()));
}