Example usage for java.util Collection size

Introduction

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

Prototype

int size();

Source Link

Document

Returns the number of elements in this collection.

Usage

From source file:Main.java

/**
 * is null or its size is 0// ww w .  j  a  va 2 s. c o m
 * 
 * <pre>
 * isEmpty(null)   =   true;
 * isEmpty({})     =   true;
 * isEmpty({1})    =   false;
 * </pre>
 * 
 * @param <V>
 * @param c
 * @return if collection is null or its size is 0, return true, else return
 *         false.
 */
public static <V> boolean isEmpty(java.util.Collection<V> c) {
    return (c == null || c.size() == 0);
}

From source file:Main.java

public static boolean isEmpty(Collection collection) {
    if (collection == null || collection.size() == 0) {
        return true;
    }//from  ww w .j a v a 2s .  c  o m

    return false;
}

From source file:Main.java

public static boolean isNotEmpty(final Collection<?> collection) {
    return collection != null && collection.size() > 0;
}

From source file:Main.java

@SuppressWarnings("unchecked")
public static <E> E last(Collection<E> collection) {
    return (E) collection.toArray()[collection.size() - 1];
}

From source file:Main.java

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

    return null == collection || 0 == collection.size();
}

From source file:Main.java

public static File[] asFileArray(Collection<File> coll) {
    return asArray(coll, new File[coll.size()]);
}

From source file:Main.java

@SuppressWarnings("rawtypes")
public static boolean allNotIn(Collection source, Collection target) {
    if (target == null || target.size() == 0) {
        return true;
    }/*from   w  ww  .  j  av  a  2s .  c o  m*/
    for (Iterator it = source.iterator(); it.hasNext();) {
        Object candidate = it.next();
        if (target.contains(candidate)) {
            return false;
        }
    }
    return true;
}

From source file:Main.java

public static <T> T getFirst(Collection<T> l) {
    return l.size() > 0 ? l.iterator().next() : null;
}

From source file:Main.java

public static int size(Collection<?> collection) {
    return isEmpty(collection) ? 0 : collection.size();
}

From source file:Main.java

public static boolean[] toBooleanArray(Collection<Boolean> c) {
    boolean arr[] = new boolean[c.size()];
    int i = 0;//from   www .  j a  va 2 s  .  co m
    for (Boolean item : c) {
        arr[i++] = item;
    }
    return arr;
}