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

final static public boolean isEmpty(Collection<Object> collection) {
    return collection == null || collection.size() == 0;
}

From source file:Main.java

public static boolean isEmpty(Collection<? extends Object> objects) {
    return ((objects == null) || (objects.size() == 0));
}

From source file:Main.java

public static boolean isPresent(Collection<? extends Object> objects) {
    return ((objects != null) && (objects.size() > 0));
}

From source file:Main.java

/**
 * Return true if <tt>a</tt> contains at least one element
 * which is not contained in <COCE>b</tt>
 *
 * @param a <tt>Collection</tt> to be examined.
 * @param b <tt>Collection</tt> to be refered to
 *
 * @return true if <tt>s</tt> contains at least one elment which is
 * not contained in <tt>b</tt>
 *///  w ww. ja  va2  s. c om
public static boolean hasOtherThan(Collection<?> a, Collection<?> b) {
    if (a.size() > b.size())
        return true;

    return !b.containsAll(a);
}

From source file:Main.java

public static <T> T random(Collection<T> coll) {
    int num = (new Random().nextInt(coll.size()));
    for (T t : coll) {
        if (--num < 0) {
            return t;
        }// w  w  w  .ja v a2  s  .  c  o  m
    }

    return null;
}

From source file:Main.java

public static int[] asIntArray(Collection<Integer> collection) {
    int[] array = new int[collection.size()];
    Iterator<Integer> iterator = collection.iterator();
    int i = 0;//from   ww w  . j  a  v  a  2  s  . c om
    while (iterator.hasNext()) {
        array[i++] = iterator.next();
    }
    return array;
}

From source file:Main.java

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

From source file:Main.java

public static boolean isEmpty(Collection<? extends Object> c) {
    return c == null || c.size() == 0;
}

From source file:Main.java

public final static String[] toArray(Collection<String> collection) {
    return collection.toArray(new String[collection.size()]);
}

From source file:Main.java

public static double[] toDoubleArray(Collection<? extends Number> c) {
    double arr[] = new double[c.size()];
    int i = 0;/*from   w ww  .  j  a  v a  2 s  .  c o m*/
    for (Number item : c) {
        arr[i++] = item.doubleValue();
    }
    return arr;
}