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 boolean isCollectionEmpty(Collection<?> collection) {
    return collection == null || collection.size() == 0;
}

From source file:Main.java

/** Convert a Collection of Bytes to a primitive array byte[]. */
public static byte[] unboxBytes(Collection<Byte> coll) {
    byte[] res = new byte[coll.size()];
    int i = 0;/*from www  .j  av  a2 s . co m*/
    for (Byte elem : coll)
        res[i++] = elem;
    return res;
}

From source file:Main.java

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

From source file:Main.java

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

From source file:Main.java

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

From source file:Main.java

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

From source file:Main.java

public static <A> Set<A> makeSet(Collection<A> xs) {
    if (xs.size() == 0)
        return Collections.<A>emptySet();
    else if (xs.size() == 1)
        return Collections.singleton(xs.iterator().next());
    else {// w ww. ja v  a2s.  co m
        Set<A> set = new HashSet<A>(xs.size());
        set.addAll(xs);
        return set;
    }
}

From source file:Main.java

private static <T extends Comparable<T>> T getExtremum(Collection<T> vals, int comparator) {
    if (vals.size() == 0)
        return null;
    Iterator<T> it = vals.iterator();
    T ret = it.next();/*from   www .  j a va 2  s .c  o m*/
    while (it.hasNext()) {
        T v = it.next();
        if (v.compareTo(ret) * comparator > 0)
            ret = v;
    }
    return ret;
}

From source file:Main.java

public static boolean isEmpty(Collection<?> collection) {
    if (collection == null || collection.size() == 0)
        return true;

    return false;
}

From source file:Main.java

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