Java Utililty Methods Collection Contain

List of utility methods to do Collection Contain

  1. HOME
  2. Java
  3. C
  4. Collection Contain

Description

The list of methods to do Collection Contain are organized into topic(s).

Method

booleancontainsNone(Collection container, Collection other)
contains None 
assert container != null;
assert other != null;
for (T t : other) {
    if (container.contains(t)) {
        return false;
return true;
...
voidcontainsNoNull(final Collection c, final String s)
Checks that the collection does not contain a null value (throws an IllegalArgumentException if it does). 
if (c.contains(null)) {
    throw new IllegalArgumentException(s);
CollectioncontainsNoNulls(Collection container)
contains No Nulls 
container = checkNotNull(container);
for (T item : container) {
    if (item == null) {
        throw new NullPointerException("Container cannot contain null values");
return container;
booleancontainsNull(Collection collection)
contains Null 
if (!isEmpty(collection)) {
    for (Object obj : collection) {
        if (obj == null) {
            return true;
return false;
...
booleancontainsNull(Collection args)
Checks whether the collection contains a null value. 
for (Object object : args) {
    if (object == null) {
        return true;
return false;
booleancontainsNull(final Collection c)
contains Null 
synchronized (c) {
    for (final Object o : c) {
        if (o == null)
            return true;
    return false;
booleancontainsNullsOrEmptyStrings(Collection c)
Returns true if c contains empty Strings or null references. 
for (String s : c) {
    if (isEmptyOrNull(s)) {
        return true;
return false;
booleancontainsNumber(Collection collection, Number number)
contains Number 
Iterator<Number> iterator = collection.iterator();
while (iterator.hasNext()) {
    Number comparable = iterator.next();
    if (comparable == null)
        return comparable == number;
    if (comparable.doubleValue() == number.doubleValue())
        return true;
return false;
booleancontainsObject(Collection c, T o)
Checks whether a Collection contains a specified Object. 
for (Object o1 : c) {
    if (o == o1) {
        return true;
return false;
booleancontainsObjectIdentity(Collection collection, Object object)
Returns true if the given Collection contains the given object. 
return indexOfObjectIdentity(collection, object) >= 0;