Example usage for java.util Collection isEmpty

Introduction

In this page you can find the example usage for java.util Collection isEmpty.

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this collection contains no elements.

Usage

From source file:Main.java

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

From source file:Main.java

public static <T> T firstElementOf(final Collection<? extends T> items) {
    if (items != null && !items.isEmpty()) {
        return items.iterator().next();
    }//from   w  w  w. j a  va2 s.  com
    return null;
}

From source file:Main.java

/**
 * Checks if the collection is null or empty.
 * @param <T> a type of element of collection
 * @param parameter the collection/*www . ja va2 s . com*/
 * @return true if the collection is null or empty
 */
public static <T> boolean isEmpty(final Collection<T> parameter) {
    return parameter == null || parameter.isEmpty();
}

From source file:Main.java

/*************************** empty ****************************************/

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

From source file:Main.java

/**
 * /*from  w w w .  ja  va  2  s .  com*/
 * @Title: isNotEmpty
 * @author:  wuwh 
 *
 * <p>check collection is empty</p>
 *
 * <pre>
 * CollectionUtil.isNotEmpty(null)   = false
 * Map.put("ddd","ddd");
 * CollectionUtil.isNotEmpty(Map)=true
 * </pre>
 *
 */
public static boolean isNotEmpty(Collection collection) {
    return null != collection && !collection.isEmpty() ? true : false;
}

From source file:Main.java

private static <V> List<V> getIndexedValuesFrom(Collection<V> arg, int initial) {
    if (null == arg || arg.isEmpty()) {
        return Collections.EMPTY_LIST;
    }/*from  ww  w.j av a 2  s. co  m*/

    List<V> indexed = new ArrayList<V>();

    for (V each : arg) {
        initial++;
        if (initial % 2 == 0) {
            continue;
        }
        indexed.add(each);
    }
    return indexed;
}

From source file:Main.java

/**
 * Tests whether c contains no elements, true if c is null or c is empty.
 * @param c Collection to test.//from ww w.j  a  va 2s .co m
 * @return Whether c contains no elements.
 */

public static boolean isNullOrEmpty(@Nullable final Collection c) {
    return c == null || c.isEmpty();
}

From source file:Main.java

/**
 * Test if a {@link Collection} is empty
 *
 * @param <T>/*from w  w  w .  j a  va  2  s  .c o  m*/
 *            the class of the objects in the list
 * @param collection
 *            Collection to test
 * @return true if collection is empty or null
 * @since 4.2
 */
public static <T> boolean isEmpty(@Nullable final Collection<T> collection) {
    return (collection == null) || collection.isEmpty();
}

From source file:Main.java

/**
 * Returns <code>true</code> if <code>collection</code> is <code>null</code>
 * or its size <code>== 0</code>.
 *///from   w  ww  .  ja v a2s. c  o m
public static <T> boolean isNullOrEmpty(Collection<T> collection) {
    if ((collection == null) || collection.isEmpty()) {
        return true;
    }

    return false;
}

From source file:Main.java

public static boolean stringMatchesAnyRegex(String s, Collection<Pattern> regexes) {
    if (s == null || regexes == null || regexes.isEmpty()) {
        return false;
    }//from   ww  w.  j  a v a  2s  .c o  m

    for (Pattern regex : regexes) {
        if (regex.matcher(s).matches())
            return true;
    }

    return false;
}