Example usage for java.util Collection contains

Introduction

In this page you can find the example usage for java.util Collection contains.

Prototype

boolean contains(Object o);

Source Link

Document

Returns true if this collection contains the specified element.

Usage

From source file:Main.java

public static <T> List<T> intersection(Collection<T> a, Collection<T> b) {
    List<T> list = new ArrayList<T>();

    for (T element : a) {
        if (b.contains(element)) {
            list.add(element);//  w  w  w .j  av  a  2  s  .c  o m
        }
    }
    return list;
}

From source file:Main.java

/**
 * @return true if collection is not null and contains the items
 *//*from  w w  w  . java  2s  .co  m*/
public static boolean contains(final Collection<?> collection, final Object item) {
    return collection != null && collection.contains(item) ? true : false;
}

From source file:Main.java

/**
 * Returns all objects in list1 that are not in list2
 *
 * @param <T> Type of items in the collection
 * @param list1 First collection/*from  w ww. j  a v  a  2s  . com*/
 * @param list2 Second collection
 * @return The collection difference list1 - list2
 */
public static <T> Collection<T> diff(Collection<T> list1, Collection<T> list2) {
    Collection<T> diff = new ArrayList<T>();
    for (T t : list1) {
        if (!list2.contains(t)) {
            diff.add(t);
        }
    }
    return diff;
}

From source file:Main.java

public static <T> boolean containsAny(Collection<T> collection, Collection<T> referenceElements) {
    for (T referenceElement : referenceElements) {
        if (collection.contains(referenceElement)) {
            return true;
        }/*from   w  w  w.  j  a  va  2s  . co  m*/
    }
    return false;
}

From source file:com.vmware.identity.rest.core.server.test.authorization.token.builder.SAMLTokenBuilderTest.java

private static void assertCollectionEquals(String message, Collection<?> expected, Collection<?> actual) {
    for (Object e : expected) {
        if (!actual.contains(e)) {
            fail(message);//from   w w  w  . j a v a  2  s .  c  o m
        }
    }
}

From source file:Main.java

public static <T extends Object> boolean hasComplement(Collection<T> c1, Collection<T> c2) {
    if (c1 == null || c2 == null)
        return false;
    for (T t1 : c1) {
        if (!c2.contains(t1))
            return true;
    }/*w w  w  .ja v a2s .c  om*/
    for (T t2 : c2) {
        if (!c1.contains(t2))
            return true;
    }
    return false;
}

From source file:Main.java

/**
 * Answers true if a predicate is true for at least one element of a
 * collection./*from   w  w  w  .  ja  v  a2 s .c o  m*/
 *
 * @param <T>
 * @param collection - the collection to get the input from, may be null
 * @param value      - value to check
 * @return true if a collection contains specified value.
 */
public static <T> boolean contains(Collection<T> collection, T value) {
    return collection != null && collection.size() > 0 && collection.contains(value);
}

From source file:Main.java

/**
 * Answers true if a predicate is true for at least one element of a
 * collection./*w ww  .  j  a  v a2 s .  c o m*/
 * 
 * @param <T>
 * @param collection
 *            - the collection to get the input from, may be null
 * @param value
 *            - value to check
 * @return true if a collection contains specified value.
 */
public static <T> boolean contains(Collection<T> collection, T value) {
    return collection != null && collection.size() > 0 ? collection.contains(value) : false;
}

From source file:Main.java

public static <E> Collection<E> asymmetricDifference(E[] c1, Collection<E> c2) {
    final Set<E> result = new HashSet<E>();
    for (final E elem : c1) {
        if (!c2.contains(elem)) {
            result.add(elem);/*from  www. j  a v  a2  s  .  c o  m*/
        }
    }
    return result;
}

From source file:Main.java

public static <T> int addAllThatDontExist(final Collection<T> source, final Collection<T> destination) {
    int count = 0;
    for (final T sourceItem : source) {
        if (!destination.contains(sourceItem)) {
            destination.add(sourceItem);
            ++count;/*  w  w w .  j av a2s .  com*/
        }
    }

    return count;
}