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Unlike sets, lists typically allow duplicate elements. More formally, lists typically allow pairs of elements e1 and e2 such that e1.equals(e2), and they typically allow multiple null elements if they allow null elements at all. It is not inconceivable that someone might wish to implement a list that prohibits duplicates, by throwing runtime exceptions when the user attempts to insert them, but we expect this usage to be rare. The List interface places additional stipulations, beyond those specified in the Collection interface, on the contracts of the iterator, add, remove, equals, and hashCode methods. Declarations for other inherited methods are also included here for convenience. The List interface provides four methods for positional (indexed) access to list elements. Lists (like Java arrays) are zero based. Note that these operations may execute in time proportional to the index value for some implementations (the LinkedList class, for example). Thus, iterating over the elements in a list is typically preferable to indexing through it if the caller does not know the implementation. The List interface provides a special iterator, called a ListIterator, that allows element insertion and replacement, and bidirectional access in addition to the normal operations that the Iterator interface provides. A method is provided to obtain a list iterator that starts at a specified position in the list. The List interface provides two methods to search for a specified object. From a performance standpoint, these methods should be used with caution. In many implementations they will perform costly linear searches. The List interface provides two methods to efficiently insert and remove multiple elements at an arbitrary point in the list. Note: While it is permissible for lists to contain themselves as elements, extreme caution is advised: the equals and hashCode methods are no longer well defined on such a list. Some list implementations have restrictions on the elements that they may contain. For example, some implementations prohibit null elements, and some have restrictions on the types of their elements. Attempting to add an ineligible element throws an unchecked exception, typically NullPointerException or ClassCastException. Attempting to query the presence of an ineligible element may throw an exception, or it may simply return false; some implementations will exhibit the former behavior and some will exhibit the latter. More generally, attempting an operation on an ineligible element whose completion would not result in the insertion of an ineligible element into the list may throw an exception or it may succeed, at the option of the implementation. Such exceptions are marked as "optional" in the specification for this interface. This interface is a member of the Java Collections Framework.Since:1.2See Also:Collection, Set, ArrayList, LinkedList, Vector, Arrays.asList(Object[]), Collections.nCopies(int, Object), Collections.EMPTY_LIST, AbstractList, AbstractSequentialListMethod SummaryAll Methods Instance Methods Abstract Methods Default Methods Modifier and TypeMethod and Descriptionbooleanadd(E e)Appends the specified element to the end of this list (optional operation).voidadd(int index, E element)Inserts the specified element at the specified position in this list (optional operation).booleanaddAll(Collection
This document may only be used if the period of endorsement has not yet expired and the proposed employment does not conflict with any restrictions or limitations listed on Form I-94 or I-94A, Arrival-Departure Record. Note: Some individuals who present this List A document, such as certain nonimmigrant students and exchange visitors, must present additional documentation in order to prove their work authorization in the U.S.
The parameterless constructor is used to create a list of strings with the default capacity. The Capacity property is displayed and then the Add method is used to add several items. The items are listed, and the Capacity property is displayed again, along with the Count property, to show that the capacity has been increased as needed.
The Contains method is used to test for the presence of an item in the list, the Insert method is used to insert a new item in the middle of the list, and the contents of the list are displayed again.
The TrimExcess method is used to reduce the capacity to match the count, and the Capacity and Count properties are displayed. If the unused capacity had been less than 10 percent of total capacity, the list would not have been resized.
Methods such as Contains, IndexOf, LastIndexOf, and Remove use an equality comparer for the list elements. The default equality comparer for type T is determined as follows. If type T implements the IEquatable generic interface, then the equality comparer is the Equals(T) method of that interface; otherwise, the default equality comparer is Object.Equals(Object).
Methods such as BinarySearch and Sort use an ordering comparer for the list elements. The default comparer for type T is determined as follows. If type T implements the IComparable generic interface, then the default comparer is the CompareTo(T) method of that interface; otherwise, if type T implements the nongeneric IComparable interface, then the default comparer is the CompareTo(Object) method of that interface. If type T implements neither interface, then there is no default comparer, and a comparer or comparison delegate must be provided explicitly.
If a value type is used for type T, the compiler generates an implementation of the List class specifically for that value type. That means a list element of a List object does not have to be boxed before the element can be used, and after about 500 list elements are created, the memory saved by not boxing list elements is greater than the memory used to generate the class implementation.
Make certain the value type used for type T implements the IEquatable generic interface. If not, methods such as Contains must call the Object.Equals(Object) method, which boxes the affected list element. If the value type implements the IComparable interface and you own the source code, also implement the IComparable generic interface to prevent the BinarySearch and Sort methods from boxing list elements. If you do not own the source code, pass an IComparer object to the BinarySearch and Sort methods
The List class is used infrequently in F# code. Instead, Lists, which are immutable, singly-linked lists, are typically preferred. An F# List provides an ordered, immutable series of values, and is supported for use in functional-style development. When used from F#, the List class is typically referred to by the ResizeArray
Ensures that the capacity of this list is at least the specified capacity. If the current capacity is less than capacity, it is successively increased to twice the current capacity until it is at least the specified capacity.
Overview
As a public service, the Office for Civil Rights (OCR) publishes this list of elementary-secondary and post-secondary institutions that are currently under investigation for discrimination involving shared ancestry. OCR updates the list weekly. For the full list of cases under investigation, please see Pending Cases Currently Under Investigation at Elementary-Secondary and Post-Secondary Schools.
Parties listed on the Unverified List (UVL) are ineligible to receive items subject to the Export Administration Regulations (EAR) by means of a license exception. In addition, exporters must file an Automated Export System record for all exports to parties listed on the UVL and obtain a statement from such parties prior to exporting, reexporting, or transferring to such parties any item subject to the EAR which is not subject to a license requirement. Restrictions on exports, reexports and transfers (in-country) to persons listed on the UVL are set forth in Section 744.15 of the EAR. The Unverified List is set forth in Supplement No. 6 to Part 744 of the EAR.
This list does not include all possible symptoms. Symptoms may change with new COVID-19 variants and can vary depending on vaccination status. CDC will continue to update this list as we learn more about COVID-19. Older adults and people who have underlying medical conditions like heart or lung disease or diabetes are at higher risk for getting very sick from COVID-19.
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List N only includes the primary product registered by EPA. These products may be marketed and sold under different brand names that you are more familiar with seeing on shelves, so we recommend that you compare the first two sections of the EPA registration number to find a product on this list. More information is available here.
A product's effectiveness can change depending on how you use it, and some pathogens are more difficult to kill than others. Because of this, disinfectants may have different directions for different pathogens. To kill SARS-CoV-2 (COVID-19), you should follow the directions on the package for the pathogen listed there.
The table below is updated regularly and lists FDA-authorized at-home OTC COVID-19 diagnostic tests, including information on expiration dates, who can use the test, links to home use instructions for each test, and other details that may help you decide what test is right for you. For additional information about each Emergency Use Authorization (EUA), see In Vitro Diagnostics EUAs: Tables of IVD EUAs.
In the table below, the "Expiration Date" column lists where to find the expiration date for that test, and the "Other Details" column lists the shelf-life for the test. The shelf-life is how long the test should work as expected and is measured from the date the test was manufactured. The expiration date is set at the end of the shelf-life and is the date through which the test is expected to perform as accurately as when manufactured. In some cases, the expiration date for a test may be extended.
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