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

/**
 * @return true if collection null or empty.
 *//*from  w  ww  .  jav a 2  s  .  c  o m*/
public static boolean isEmpty(final Collection<?> col) {
    return col == null || col.isEmpty();
}

From source file:Main.java

public static String join(Collection<?> items, String delimiter) {
    if (items == null || items.isEmpty()) {
        return "";
    }//  www. ja  v  a2s  . c o  m

    final Iterator<?> iter = items.iterator();
    final StringBuilder buffer = new StringBuilder(iter.next().toString());

    while (iter.hasNext()) {
        buffer.append(delimiter).append(iter.next());
    }

    return buffer.toString();
}

From source file:Main.java

/**
 * @return true if collection not empty (null safe).
 *//*from w w  w.  j a  va 2 s.co m*/
public static boolean isNotEmpty(final Collection<?> col) {
    return col != null && !col.isEmpty();
}

From source file:Main.java

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

From source file:Main.java

/**
 * Return {@code true} if the supplied Collection is {@code null}
 * or empty. Otherwise, return {@code false}.
 * @param collection the Collection to check
 * @return whether the given Collection is empty
 *///from w  ww  . j av a2 s. c  o m
@SuppressWarnings("rawtypes")
public static boolean isEmpty(Collection collection) {
    return (collection == null || collection.isEmpty());
}

From source file:Main.java

public static boolean isEmpty(@SuppressWarnings("rawtypes") Collection collection) {
    return (collection == null || collection.isEmpty());
}

From source file:Main.java

public static boolean hasAtLeastOneNotNullElement(Collection<?> collection) {
    if (collection == null)
        return false;
    if (collection.isEmpty())
        return false;
    if (collection.contains(null))
        return collection.size() > 1;
    return collection.size() > 0;
}

From source file:Main.java

public static final void distinctCollection(Collection<? extends Object> collection) {
    if (collection != null && !collection.isEmpty()) {
        Set<? extends Object> distinctSet = new HashSet<Object>(collection);

        collection.clear();//from  w  ww  . j  a v a2  s  . c om

        ((Collection<Object>) collection).addAll(distinctSet);
    }
}

From source file:Main.java

public static boolean isEmpty(@Nullable final Collection<?> aCont) {
    return aCont == null || aCont.isEmpty();
}

From source file:Main.java

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