Example usage for java.util Collection isEmpty

Introduction

In this page you can find the example usage for java.util Collection isEmpty.

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:Main.java

public static boolean isNotEmpty(Collection<?> collection) {
    return ((collection != null) && !(collection.isEmpty()));
}

From source file:Main.java

public static boolean isEmpty(Collection<?> collection) {

    if (null == collection || collection.isEmpty() || collection.size() <= 0)
        return true;
    return false;
}

From source file:Main.java

/**
 * Check if collection is null or empty.
 * @param collection The collection to check
 * @return true if collection is null or empty and false if isn't null <b>and</b> have one or more elements
 */// w w  w .  ja  va 2 s .  c  om
public static final boolean isEmpty(Collection<?> collection) {
    return (collection == null || collection.isEmpty());
}

From source file:Main.java

public static boolean isNullOrNothing(final Collection collection) {
    return collection == null || collection.isEmpty();
}

From source file:Main.java

public static boolean isNotEmpty(Collection<?> test) {
    return test != null && !test.isEmpty();
}

From source file:Main.java

/**
 * Returns whether specified collection is empty or not.
 *
 * @param collection collection to process
 * @return true if specified collection is empty, false otherwise
 *///from w  w  w .ja  v a  2  s.c  o  m
public static boolean isEmpty(final Collection collection) {
    return collection == null || collection.isEmpty();
}

From source file:Main.java

/**
 * Provides a wrapper to create a list out of a collection
 * @param wrappedCollection nullable collection
 * @param <T> type parameter of collection and resulting list
 * @return list of Ts from wrappedCollection or empty list
 *//*from  www. j  a v  a2  s  .  c o m*/
public static <T> List<T> listFrom(Collection<T> wrappedCollection) {
    if (wrappedCollection == null || wrappedCollection.isEmpty()) {
        return new ArrayList<T>();
    } else {
        return new ArrayList<T>(wrappedCollection);
    }
}

From source file:Main.java

/**
 * get random elements from a collection
 *
 * @param <T>//ww w . j av  a  2 s  .  c o  m
 * @param elements
 * @return
 */
public static <T> T getRandomElement(Collection<T> elements) {
    if (elements == null || elements.isEmpty()) {
        throw new IllegalArgumentException(" collection must have element!");
    }
    random.setSeed(System.currentTimeMillis());
    int offset = random.nextInt() % elements.size();
    for (T element : elements) {
        if (offset == 0) {
            return element;
        }
        offset--;
    }

    return null;
}

From source file:Main.java

public static <I, T extends Collection<I>> T shallowCloneTo(Collection<I> srcCollection, T destCollection) {
    if (srcCollection == null || srcCollection.isEmpty())
        return destCollection;
    destCollection.addAll(srcCollection);
    return destCollection;
}

From source file:Main.java

public static <T> boolean isNotEmpty(final Collection<T> collection) {
    return collection != null && !collection.isEmpty();
}