Example usage for java.util Map isEmpty

Introduction

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

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this map contains no key-value mappings.

Usage

From source file:Main.java

/**
 * Return <code>true</code> if the supplied Map is <code>null</code> or empty. Otherwise, return <code>false</code>.
 * /*w  w w.ja  v  a  2  s.c  o m*/
 * @param map
 *            the Map to check
 * @return whether the given Map is empty
 */
public static boolean isEmpty(Map<?, ?> map) {
    return ((map == null) || map.isEmpty());
}

From source file:Main.java

public static boolean isEmpty(final Map<?, ?> map) {
    return map == null || map.isEmpty();
}

From source file:Main.java

public static boolean isEmpty(Map<? extends Object, ? extends Object> map) {
    return (map == null) || (map.isEmpty());
}

From source file:Main.java

/**
 * Tests whether map contains no elements, true if map is null or map is empty.
 * @param map Map to test.//from   w  w w. ja  v  a  2s . c o  m
 * @return Whether map contains no elements.
 */

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

From source file:Main.java

/** Checks if a map is null or empty. */
public static boolean isNullOrEmpty(@Nullable Map<?, ?> potentiallyNull) {
    return potentiallyNull == null || potentiallyNull.isEmpty();
}

From source file:Main.java

public static boolean isNotEmpty(Map<? extends Object, ? extends Object> map) {
    return (map != null) && (!map.isEmpty());
}

From source file:Main.java

/**
 * Return <code>true</code> if the supplied Map is <code>null</code> or
 * empty. Otherwise, return <code>false</code>.
 * /*from  www  . j  a v  a  2s .c  om*/
 * @param map
 *            the Map to check
 * @return whether the given Map is empty
 */
public static boolean isEmpty(final Map<?, ?> map) {
    return ((map == null) || map.isEmpty());
}

From source file:Main.java

/**
 * makes sense only if iteration order deterministic!
 *///  w w w.  ja  v a 2  s. co  m
private static <K, V> Map.Entry<K, V> getRandomElement(final boolean remove, final Random random,
        final Map<K, V> map) {
    if (map.isEmpty())
        throw new IllegalArgumentException("map is empty!");
    final int index = random.nextInt(map.size());

    final Iterator<Map.Entry<K, V>> it = map.entrySet().iterator();
    int i = 0;

    while (i++ < index)
        it.next();

    final Map.Entry<K, V> elem = it.next();
    if (remove)
        it.remove();
    return elem;
}

From source file:Main.java

public static boolean isNotEmpty(final Map<?, ?> m) {
    return m != null && m.isEmpty() == false;
}

From source file:Main.java

public static boolean isNull(Map<?, ?> map) {
    if (map == null || map.isEmpty()) {
        return true;
    }/*w  w  w  .j  av  a2  s . com*/
    return false;
}