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

/**
 * Null-safe check if the specified collection is empty.
 * /*from   www  .j a  v  a2  s  .com*/
 * @param coll  the collection to check, may be null
 * @return true if empty or null
 */
public static boolean isEmpty(Collection<?> coll) {
    return (coll == null || coll.isEmpty());
}

From source file:Main.java

public static boolean isNotEmpty(Collection collection) {
    return (collection != null) && !(collection.isEmpty());
}

From source file:Main.java

public static <T> boolean containsByValue(Collection<? extends T> c, T item) {
    if (c == null || c.isEmpty())
        return false;
    for (T i : c) {
        if (i.equals(item))
            return true;
    }//w w  w.ja v a2  s.com
    return false;
}

From source file:Main.java

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

From source file:Main.java

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

From source file:Main.java

private static <E> boolean isEmpty(Collection<E> collection) {

    return (collection == null || collection.isEmpty());
}

From source file:Main.java

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

From source file:Main.java

public static boolean isNotEmpty(Collection<?> col) {
    return col != null && !col.isEmpty();
}

From source file:Main.java

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

From source file:Main.java

/**
 * Implementation of the OCL//from  w  w  w.jav  a 2s. c  om
 * <ul>
 * <li><tt>OrderedSet::first() : T</tt></li>
 * <li><tt>Sequence::first() : T</tt></li>
 * </ul>
 * operations.
 * 
 * @param self the source collection
 * @return the first object of the source collection
 */
public static <E> E first(Collection<E> self) {
    if (self.isEmpty()) {
        return null; // undefined
    }
    return self.iterator().next();
}