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 isNotEmpty(Collection<?> col) {
    return col != null && col.size() > 0;
}

From source file:Main.java

@SuppressWarnings("rawtypes")
public static boolean isBlank(Collection c) {
    return c == null || c.size() == 0;
}

From source file:Main.java

@SuppressWarnings("rawtypes")
public static boolean isNotBlank(Collection c) {
    return c != null && c.size() > 0;
}

From source file:Main.java

public static double average(Collection<Double> arr) {
    if (arr.size() > 0) {
        return sum(arr) / arr.size();
    } else {//from  w w w .  j  a v  a 2s .  c o  m
        return 0;
    }
}

From source file:Main.java

public static boolean isEmpty(Collection<?> objs) {
    if (objs == null || objs.size() <= 0) {
        return true;
    }/*from  w  w  w  .j a  va2 s  .c  o m*/
    return false;
}

From source file:Main.java

public static <T> T getSingle(Collection<T> configs) {
    if (configs.size() == 1) {
        for (T t : configs) {
            return t;
        }//from   www  .ja  v a 2s  . c o m
    }
    return null;
}

From source file:Main.java

/**
 *  Returns <code>true</code> if the passed collection is not <code>null</code>
 *  and has size &gt; 0.//  w ww  .j  a v a2 s  .co m
 */
public static boolean isNotEmpty(Collection<?> c) {
    return (c != null) && (c.size() > 0);
}

From source file:Main.java

public static boolean intersect(Collection<?> a, Collection<?> b) {
    if (b.size() > a.size()) {
        Collection<?> c = a;
        a = b;/* ww  w  . j av a2  s  .  c o  m*/
        b = c;
    }
    return intersect(a, (Iterable<?>) b);
}

From source file:Main.java

/**
 * Return the first item from a collection using the most efficient
 * method possible. Returns null for an empty collection.
 *
 * @param c The Collection./*w w w  .  j a  v a2s  . c  o m*/
 * @return the first element of a Collection.
 */
public static Object getFirstItemOrNull(Collection c) {
    if (c.size() == 0) {
        return null;
    }
    return getFirstItem(c);
}

From source file:Main.java

/**
 * @param c/*from   ww w .j  a va 2  s  .  com*/
 * @return size of {@link c} if c is not {@code null}, 0 otherwise
 */
public static int size(Collection<?> c) {
    return c != null ? c.size() : 0;
}