List of usage examples for java.util Collection isEmpty
boolean isEmpty();
From source file:Main.java
/** * @return True if the input collection is null of empty */// w ww.j a v a 2 s .com public static boolean isNullOrEmpty(@Nullable Collection c) { return c == null || c.isEmpty(); }
From source file:Main.java
public static boolean isEmpty(Collection<?> collectionToCheck) { return collectionToCheck == null || collectionToCheck.isEmpty(); }
From source file:Main.java
public static boolean isEmpty(Collection<? extends Object> list) { return (list == null) || (list.isEmpty()); }
From source file:Main.java
public static Long[] collectionToArray(Collection<String> collection) { if (collection == null || collection.isEmpty()) { return null; }// www .j a v a 2 s . c o m Long[] arry = new Long[collection.size()]; int index = 0; for (String value : collection) { arry[index++] = Long.valueOf(value); } return arry; }
From source file:Main.java
public static boolean isEmpty(Collection<?> colletion) { return colletion == null || colletion.isEmpty(); }
From source file:Main.java
public static boolean isEmpty(Collection collection) { return collection == null || collection.isEmpty(); }
From source file:Main.java
/** * @param nums Any descendant of Number (Integer, Short, Double, Float, etc) * @return The mean of the number, or Double.NaN if the list is empty. *//*from www . ja va 2 s .co m*/ public static double mean(Collection<? extends Number> nums) { if (nums == null || nums.isEmpty()) { return Double.NaN; } double sum = 0.0; for (Number n : nums) { sum += n.doubleValue(); } return sum / nums.size(); }
From source file:Main.java
public static boolean isNotEmpty(Collection<? extends Object> list) { return (list != null) && (!list.isEmpty()); }
From source file:Main.java
public static <O> O getRandom(final Collection<O> pObjects) { if (pObjects != null && !pObjects.isEmpty()) { int r = Math.abs(random.nextInt() % pObjects.size()); List<O> objects = !(pObjects instanceof List) ? new ArrayList<O>(pObjects) : (List<O>) pObjects; return objects.get(r); }/*from w w w . j a va 2 s. c o m*/ return null; }
From source file:Main.java
public static boolean isEmpty(Collection collection) { return (collection == null || collection.isEmpty()); }