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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package java.util;
/**
* A {@code List} is a collection which maintains an ordering for its elements. Every
* element in the {@code List} has an index. Each element can thus be accessed by its
* index, with the first index being zero. Normally, {@code List}s allow duplicate
* elements, as compared to Sets, where elements have to be unique.
*/
public interface List extends Collection {
/**
* Inserts the specified object into this {@code List} at the specified location.
* The object is inserted before the current element at the specified
* location. If the location is equal to the size of this {@code List}, the object
* is added at the end. If the location is smaller than the size of this
* {@code List}, then all elements beyond the specified location are moved by one
* position towards the end of the {@code List}.
*
* @param location
* the index at which to insert.
* @param object
* the object to add.
* @throws UnsupportedOperationException
* if adding to this {@code List} is not supported.
* @throws ClassCastException
* if the class of the object is inappropriate for this
* {@code List}.
* @throws IllegalArgumentException
* if the object cannot be added to this {@code List}.
* @throws IndexOutOfBoundsException
* if {@code location < 0 || location > size()}
*/
public void add(int location, E object);
/**
* Adds the specified object at the end of this {@code List}.
*
* @param object
* the object to add.
* @return always true.
* @throws UnsupportedOperationException
* if adding to this {@code List} is not supported.
* @throws ClassCastException
* if the class of the object is inappropriate for this
* {@code List}.
* @throws IllegalArgumentException
* if the object cannot be added to this {@code List}.
*/
public boolean add(E object);
/**
* Inserts the objects in the specified collection at the specified location
* in this {@code List}. The objects are added in the order they are returned from
* the collection's iterator.
*
* @param location
* the index at which to insert.
* @param collection
* the collection of objects to be inserted.
* @return true if this {@code List} has been modified through the insertion, false
* otherwise (i.e. if the passed collection was empty).
* @throws UnsupportedOperationException
* if adding to this {@code List} is not supported.
* @throws ClassCastException
* if the class of an object is inappropriate for this
* {@code List}.
* @throws IllegalArgumentException
* if an object cannot be added to this {@code List}.
* @throws IndexOutOfBoundsException
* if {@code location < 0 || location > size()}
*/
public boolean addAll(int location, Collection collection);
/**
* Adds the objects in the specified collection to the end of this {@code List}. The
* objects are added in the order in which they are returned from the
* collection's iterator.
*
* @param collection
* the collection of objects.
* @return {@code true} if this {@code List} is modified, {@code false} otherwise
* (i.e. if the passed collection was empty).
* @throws UnsupportedOperationException
* if adding to this {@code List} is not supported.
* @throws ClassCastException
* if the class of an object is inappropriate for this
* {@code List}.
* @throws IllegalArgumentException
* if an object cannot be added to this {@code List}.
*/
public boolean addAll(Collection collection);
/**
* Removes all elements from this {@code List}, leaving it empty.
*
* @throws UnsupportedOperationException
* if removing from this {@code List} is not supported.
* @see #isEmpty
* @see #size
*/
public void clear();
/**
* Tests whether this {@code List} contains the specified object.
*
* @param object
* the object to search for.
* @return {@code true} if object is an element of this {@code List}, {@code false}
* otherwise
*/
public boolean contains(Object object);
/**
* Tests whether this {@code List} contains all objects contained in the
* specified collection.
*
* @param collection
* the collection of objects
* @return {@code true} if all objects in the specified collection are
* elements of this {@code List}, {@code false} otherwise.
*/
public boolean containsAll(Collection collection);
/**
* Compares the given object with the {@code List}, and returns true if they
* represent the same object using a class specific comparison. For
* {@code List}s, this means that they contain the same elements in exactly the same
* order.
*
* @param object
* the object to compare with this object.
* @return boolean {@code true} if the object is the same as this object,
* and {@code false} if it is different from this object.
* @see #hashCode
*/
public boolean equals(Object object);
/**
* Returns the element at the specified location in this {@code List}.
*
* @param location
* the index of the element to return.
* @return the element at the specified location.
* @throws IndexOutOfBoundsException
* if {@code location < 0 || location >= size()}
*/
public E get(int location);
/**
* Returns the hash code for this {@code List}. It is calculated by taking each
* element' hashcode and its position in the {@code List} into account.
*
* @return the hash code of the {@code List}.
*/
public int hashCode();
/**
* Searches this {@code List} for the specified object and returns the index of the
* first occurrence.
*
* @param object
* the object to search for.
* @return the index of the first occurrence of the object or -1 if the
* object was not found.
*/
public int indexOf(Object object);
/**
* Returns whether this {@code List} contains no elements.
*
* @return {@code true} if this {@code List} has no elements, {@code false}
* otherwise.
* @see #size
*/
public boolean isEmpty();
/**
* Returns an iterator on the elements of this {@code List}. The elements are
* iterated in the same order as they occur in the {@code List}.
*
* @return an iterator on the elements of this {@code List}.
* @see Iterator
*/
public Iterator iterator();
/**
* Searches this {@code List} for the specified object and returns the index of the
* last occurrence.
*
* @param object
* the object to search for.
* @return the index of the last occurrence of the object, or -1 if the
* object was not found.
*/
public int lastIndexOf(Object object);
/**
* Returns a {@code List} iterator on the elements of this {@code List}. The elements are
* iterated in the same order that they occur in the {@code List}.
*
* @return a {@code List} iterator on the elements of this {@code List}
*
* @see ListIterator
*/
public ListIterator listIterator();
/**
* Returns a list iterator on the elements of this {@code List}. The elements are
* iterated in the same order as they occur in the {@code List}. The iteration
* starts at the specified location.
*
* @param location
* the index at which to start the iteration.
* @return a list iterator on the elements of this {@code List}.
* @throws IndexOutOfBoundsException
* if {@code location < 0 || location > size()}
* @see ListIterator
*/
public ListIterator listIterator(int location);
/**
* Removes the object at the specified location from this {@code List}.
*
* @param location
* the index of the object to remove.
* @return the removed object.
* @throws UnsupportedOperationException
* if removing from this {@code List} is not supported.
* @throws IndexOutOfBoundsException
* if {@code location < 0 || location >= size()}
*/
public E remove(int location);
/**
* Removes the first occurrence of the specified object from this {@code List}.
*
* @param object
* the object to remove.
* @return true if this {@code List} was modified by this operation, false
* otherwise.
* @throws UnsupportedOperationException
* if removing from this {@code List} is not supported.
*/
public boolean remove(Object object);
/**
* Removes all occurrences in this {@code List} of each object in the specified
* collection.
*
* @param collection
* the collection of objects to remove.
* @return {@code true} if this {@code List} is modified, {@code false} otherwise.
* @throws UnsupportedOperationException
* if removing from this {@code List} is not supported.
*/
public boolean removeAll(Collection collection);
/**
* Removes all objects from this {@code List} that are not contained in the
* specified collection.
*
* @param collection
* the collection of objects to retain.
* @return {@code true} if this {@code List} is modified, {@code false} otherwise.
* @throws UnsupportedOperationException
* if removing from this {@code List} is not supported.
*/
public boolean retainAll(Collection collection);
/**
* Replaces the element at the specified location in this {@code List} with the
* specified object. This operation does not change the size of the {@code List}.
*
* @param location
* the index at which to put the specified object.
* @param object
* the object to insert.
* @return the previous element at the index.
* @throws UnsupportedOperationException
* if replacing elements in this {@code List} is not supported.
* @throws ClassCastException
* if the class of an object is inappropriate for this
* {@code List}.
* @throws IllegalArgumentException
* if an object cannot be added to this {@code List}.
* @throws IndexOutOfBoundsException
* if {@code location < 0 || location >= size()}
*/
public E set(int location, E object);
/**
* Returns the number of elements in this {@code List}.
*
* @return the number of elements in this {@code List}.
*/
public int size();
/**
* Returns a {@code List} of the specified portion of this {@code List} from the given start
* index to the end index minus one. The returned {@code List} is backed by this
* {@code List} so changes to it are reflected by the other.
*
* @param start
* the index at which to start the sublist.
* @param end
* the index one past the end of the sublist.
* @return a list of a portion of this {@code List}.
* @throws IndexOutOfBoundsException
* if {@code start < 0, start > end} or {@code end >
* size()}
*/
public List subList(int start, int end);
/**
* Returns an array containing all elements contained in this {@code List}.
*
* @return an array of the elements from this {@code List}.
*/
public Object[] toArray();
/**
* Returns an array containing all elements contained in this {@code List}. If the
* specified array is large enough to hold the elements, the specified array
* is used, otherwise an array of the same type is created. If the specified
* array is used and is larger than this {@code List}, the array element following
* the collection elements is set to null.
*
* @param array
* the array.
* @return an array of the elements from this {@code List}.
* @throws ArrayStoreException
* if the type of an element in this {@code List} cannot be stored
* in the type of the specified array.
*/
public T[] toArray(T[] array);
}
