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

public static short[] asShortArray(Collection<Short> collection) {
    short[] array = new short[collection.size()];
    Iterator<Short> iterator = collection.iterator();
    int i = 0;//from ww  w.  j  a  v  a2s  .  c o m
    while (iterator.hasNext()) {
        array[i++] = iterator.next();
    }
    return array;
}

From source file:Main.java

public static <T> boolean isEmpty(Collection<T> list) {

    if (list == null || list.isEmpty() || list.size() == 0) {
        return true;
    }//from w w  w.  j  a  v  a  2 s . com
    return false;
}

From source file:Main.java

/**
 * return collection size/*from w w w.  j  a va2 s .  c  o m*/
 *
 * @param collection <code>java.util.Collection</code>
 * @return size of collection
 */
public static int getCollectionSize(Collection collection) {
    return collection != null ? collection.size() : 0;
}

From source file:Main.java

public static boolean isNEmpty(Collection<?> collection) {
    if ((collection != null) && (collection.size() > 0)) {
        return true;
    }//from  www  . j a  v a2  s.co m
    return false;
}

From source file:Main.java

public static <T> boolean hasDuplicates(Collection<? extends T> xs) {
    HashSet<T> ys = new HashSet<>(xs.size());

    for (T x : xs)
        if (!ys.add(x))
            return true;

    return false;
}

From source file:Main.java

public static <T extends Object> void addAll(Collection<T> target, Collection<T> source) {
    if (target != null && source != null && source.size() > 0) {
        target.addAll(source);//from w w  w .j a v  a  2s. c o m
    }
}

From source file:Main.java

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

From source file:Main.java

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

From source file:Main.java

public static char[] asCharArray(Collection<Character> collection) {
    char[] array = new char[collection.size()];
    Iterator<Character> iterator = collection.iterator();
    int i = 0;//from   ww w  .ja v a2s.  c  o  m
    while (iterator.hasNext()) {
        array[i++] = iterator.next();
    }
    return array;
}

From source file:Main.java

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