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 <T> T firstElement(final Collection<T> values) {
    if (values != null && values.size() > 0) {
        return values.iterator().next();
    }/*from  w  ww  .ja  v a2s  .  c o m*/
    return null;
}

From source file:Main.java

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

From source file:Main.java

public static <T> boolean isEmpty(Collection<T> coll) {
    if (coll == null || coll.size() == 0) {
        return true;
    }/*from  w  ww  .  j  ava  2 s .c o m*/
    return false;
}

From source file:Main.java

public static String[] listToArrays(Collection<String> values) {
    String[] ret = new String[values.size()];
    values.toArray(ret);/* w  ww.ja  v  a2s.c o  m*/
    return ret;
}

From source file:Main.java

public static <T> boolean isNullOrEmpty(Collection<T> c) {
    return (c == null) || (c.size() == 0);
}

From source file:Main.java

public static boolean isNotNull(Collection<?> collection) {
    if (collection != null && collection.size() > 0) {
        return true;
    }//from  w  w w  . j a v  a  2s .  c o  m
    return false;
}

From source file:Main.java

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

From source file:Main.java

/**
 * Returns <tt>true</tt> if the collection is null or contains no elements.
 *
 * @param items collection//from   w  w w.  j  av  a 2 s. c o  m
 * @return <tt>true</tt> if the collection is null or contains no elements
 */
public static boolean isEmpty(Collection items) {
    return (items == null || items.size() == 0);
}

From source file:Main.java

public static int largestList(Collection<? extends Collection> cs) {
    if (cs.isEmpty())
        return -1;
    int large = 0;
    for (Collection c : cs) {
        large = Math.max(large, c.size());
    }/*from  w  w  w  .  j av a 2s  . c  om*/
    return large;
}

From source file:Main.java

public static double[] toDoubleArray(Collection<Double> ds) {
    double[] out = new double[ds.size()];
    int index = 0;
    for (Double d : ds)
        out[index++] = d;// w ww . ja v  a 2s.  com
    return out;
}