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 isNull(Collection<?> con) {
    if (con == null || con.isEmpty()) {
        return true;
    }/*from  ww  w  . j  a  v  a2 s .  com*/
    return false;
}

From source file:Main.java

/**
 * Null-safe check if the specified collection is empty.
 *
 * @param collection//w  ww .j  av  a2  s .c  o m
 *            the collection to check
 * @return true if empty or null
 */
public static boolean isEmpty(final Collection<?> collection) {
    return collection == null || collection.isEmpty();
}

From source file:Main.java

public static boolean isEmpty(Collection c) {
    if (c == null) {
        return true;
    }/*from  w  ww  . jav a 2 s  . c  om*/
    return c.isEmpty();
}

From source file:Main.java

public static <T> List<T> subCollection(Collection<T> collection, int start, int end) {
    if (null == collection || collection.isEmpty())
        return null;
    int count = 0;
    List<T> result = new ArrayList<T>();
    for (T item : collection) {
        if (start >= count && count < end) {
            result.add(item);//from   w w w.j ava 2  s . c o m
        }
        count++;
    }
    return result;
}

From source file:Main.java

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

From source file:Main.java

/**
 * Provides a wrapper to create a list out of a collection
 * @param wrappedCollection nullable collection
 * @param <T> type parameter of collection and resulting list
 * @return list of Ts from wrappedCollection or empty list
 *//*from w  w w .jav a 2s. com*/
@Nonnull
public static <T> List<T> listFrom(@Nullable Collection<T> wrappedCollection) {
    if (wrappedCollection == null || wrappedCollection.isEmpty()) {
        return new ArrayList<T>();
    } else {
        return new ArrayList<T>(wrappedCollection);
    }
}

From source file:Main.java

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

From source file:Main.java

/**
 * Indique si une collection est null ou vide.
 *
 * @param c//from w ww.j  av  a  2 s .  c o  m
 * @return boolean
 */
public static boolean isNullOrEmpty(Collection c) {
    if (c == null) {
        return true;
    }

    return c.isEmpty();
}

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 last(Collection<T> collection) {
    if (collection == null || collection.isEmpty()) {
        return null;
    }/*from ww w  . j ava2 s .  com*/
    Iterator<T> iterator = collection.iterator();
    T elem = null;
    while (iterator.hasNext()) {
        elem = iterator.next();
    }
    return elem;
}