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

/** Returns true if all elements in the collection are the same */
public static <T> boolean allEqual(Collection<T> elements) {
    if (elements.isEmpty())
        return false;
    Iterator<T> it = elements.iterator();
    T first = it.next();//from  w  ww.j  a va  2 s .c o m
    while (it.hasNext()) {
        T el = it.next();
        if (!el.equals(first))
            return false;
    }
    return true;
}

From source file:Main.java

public static boolean isEmpty(Collection<?> target) {

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

From source file:Main.java

public static Class<?> getTypeOfFirstElement(Collection<?> collection) {
    if (collection.isEmpty()) {
        return null;
    } else {/*from   w ww. j  a  va 2s .  c  o m*/
        return getFirstObject(collection).getClass();
    }
}

From source file:Main.java

/**
 * Null-safe check if the specified collection is empty.
 * <p>//from w w  w. j a  v  a2 s  . c  om
 * Null returns true.
 *
 * @param coll  the collection to check, may be null
 * @return true if empty or null
 * @since Commons Collections 3.2
 */
public static boolean isEmpty(Collection coll) {
    return (coll == null || coll.isEmpty());
}

From source file:Main.java

public static boolean isEmpty(Collection coll) {
    if (coll == null || coll.isEmpty()) {
        return true;
    }/*ww  w .j  a va2 s . com*/
    return false;
}

From source file:Main.java

/**
 *  Get the first item in a list.  If there is no such item, return
 *  null.//w ww  . j  a v a2  s . c o m
 */
public static <T> T first(Collection<T> list) {
    if (list == null || list.isEmpty())
        return null;

    return list.iterator().next();
}

From source file:Main.java

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

From source file:Main.java

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

From source file:Main.java

/**
 * Checks the collection for content.//from  w w w.j a v a2 s. co m
 * 
 * @param coll The collection to test.
 * @return True if the list is null or empty, false if there is any content.
 */
public static boolean isNullOrEmpty(Collection<?> coll) {
    return coll == null || coll.isEmpty();
}

From source file:Main.java

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