1.2 KiB
1.2 KiB
+++ title = "utils" draft = false tags = [ "code", "java", "utils" ] date = "2013-03-12" +++
Utility methods
SetUtils
public class SetUtil {
public static <T> Set<T> asSet(T... elements) {
return new HashSet<T>(Arrays.asList(elements));
}
public static <T> boolean bevat(Set<T> someSet, Predicate<T> predicate) {
return !Sets.filter(someSet, predicate).isEmpty();
}
public static <E> Set<E> cast(Set<?> someSet, Class<E> classToCastTo) {
Set<E> newSet = new LinkedHashSet<E>();
for (Object object : someSet) {
newSet.add(classToCastTo.cast(object));
}
return newSet;
}
}
ListUtils
public class ListUtil {
public static <T> List<T> sort(Collection<T> collection, Comparator<? super T> comparator) {
List<T> toSort = new ArrayList<T>(collection);
Collections.sort(toSort, comparator);
return toSort;
}
public static boolean bevatDubbels(List<?> aList) {
return Sets.newHashSet(aList).size() != aList.size();
}
public static <T> List<T> cast(List<?> aList, Class<T> clazz) {
List<T> result = new ArrayList<T>();
for (Object obj : aList) {
result.add(clazz.cast(obj));
}
return result;
}
}