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 double[] asDoubleArray(Collection<Double> coll) {
    double[] result = new double[coll.size()];
    int index = 0;
    for (Double element : coll) {
        result[index] = element;//from   ww w .  ja va  2 s.  co m
        index++;
    }

    return result;
}

From source file:Main.java

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

From source file:Main.java

public static <T> T getLastElement(Collection<T> collection) {
    return getElement(collection, collection.size() - 1);
}

From source file:Main.java

public static Class<?>[] asClassArray(Collection<Class<?>> coll) {
    return asArray(coll, new Class<?>[coll.size()]);
}

From source file:Main.java

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

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

From source file:Main.java

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

From source file:Main.java

@SuppressWarnings("unchecked")
public static <T> List<T> merge(Collection<T> c1, Collection<T> c2) {
    List list = new ArrayList(c1.size() + c2.size());
    list.addAll(c1);/*w ww .j a  v  a 2s. co m*/
    list.addAll(c2);
    return list;
}

From source file:Main.java

public static float[] asFloatArray(Collection<Float> collection) {
    float[] array = new float[collection.size()];
    Iterator<Float> iterator = collection.iterator();
    int i = 0;/*from   w  w  w. ja v  a 2s  . co m*/
    while (iterator.hasNext()) {
        array[i++] = iterator.next();
    }
    return array;
}

From source file:Main.java

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

From source file:Main.java

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