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 <T> boolean isEmpty(Collection<T> collection) {
    if (collection == null) {
        return true;
    }//from  w w  w.j  av  a 2s.  co m
    return collection.isEmpty();
}

From source file:me.taylorkelly.mywarp.util.CommandUtils.java

/**
 * Joins all warps in the given collection in one string, separated by {@code ", "}.
 *
 * @param warps a collection of warps//ww w.  j a  v  a 2  s. co  m
 * @return a string with all warp-names or {@code -} if the collection was empty
 */
public static String joinWarps(Collection<Warp> warps) {
    if (warps.isEmpty()) {
        return "-";
    }

    StrBuilder ret = new StrBuilder();
    for (Warp warp : warps) {
        ret.appendSeparator(", ");
        ret.append(warp.getName());
    }
    return ret.toString();
}

From source file:Main.java

public static <T> List<T> sub(Collection<T> list, int start, int end) {
    if (list == null || list.isEmpty()) {
        return new ArrayList<>();
    }//from w  w w .  jav  a2s  .  co m

    return sub(new ArrayList<T>(list), start, end);
}

From source file:Main.java

/**
 * Check if collection is not <tt>null</tt> and empty
 *
 * @param collection/*from  w  w  w.j  ava 2  s.  c o  m*/
 *            Collection to check
 *
 * @return <tt>true</tt>, if collection is not null and empty, else
 *         <tt>false</tt>
 */
public static <T> boolean isEmpty(Collection<T> collection) {
    return collection != null && collection.isEmpty();
}

From source file:Main.java

/**
 * Return <code>true</code> if the supplied Collection is <code>null</code>
 * or empty. Otherwise, return <code>false</code>.
 *
 * @param collection the Collection to check
 * @return whether the given Collection is empty
 *///  www  .java2s  . c  o m
public static boolean isEmpty(Collection collection) {
    return (collection == null || collection.isEmpty());
}

From source file:Main.java

/**
 * Checks to see if a collection is empty
 * <p>/*from w w  w.ja v  a  2 s.  c om*/
 * An empty collection is one that is null or has zero elements.  Everything else is
 * considered non-empty.
 * </p>
 *
 * @param collection The collection to check
 * @param <T>        The type of the collection
 * @return true if the collection is null or empty, false otherwise
 */
public static <T> boolean isEmpty(Collection<T> collection) {
    return collection == null || collection.isEmpty();
}

From source file:Main.java

public static String toStringWithDelimiter(final Collection<?> collection, final String delimiter) {
    if ((collection == null) || collection.isEmpty()) {
        return "";
    }//from  ww  w .ja va 2s .  c o m

    final StringBuilder stringBuilder = new StringBuilder(collection.size());
    int i = 0;
    for (final Object o : collection) {
        stringBuilder.append(o);
        ++i;
        if (collection.size() != i) {
            stringBuilder.append(delimiter);
        }

    }
    return stringBuilder.toString();
}

From source file:Main.java

/**
 * Return <code>true</code> if the supplied Collection is <code>null</code>
 * or empty. Otherwise, return <code>false</code>.
 * @param collection the Collection to check
 *//*from   w ww . j av a2s .co m*/
@SuppressWarnings("unchecked")
public static boolean isEmpty(Collection collection) {
    return (collection == null || collection.isEmpty());
}

From source file:Main.java

public static boolean isSameCollection(Collection<?> newCollection, Collection<?> oldCollection) {
    if (newCollection == null || newCollection.isEmpty()) {
        return true;
    } else if (oldCollection != null) {
        if (newCollection.containsAll(oldCollection) && oldCollection.containsAll(newCollection)) {
            return true;
        } else {//w w  w.j av a  2 s  .c  om
            return false;
        }
    }
    return false;
}

From source file:Main.java

public static boolean isNotEmpty(Collection<?> c) {
    if (c == null) {
        return false;
    }/*w w w. j  ava  2s . co m*/
    return !c.isEmpty();
}