Android add arraylist to top array list other năm 2024

Resizable-array implementation of the

public boolean add (E e)

2 interface. Implements all optional list operations, and permits all elements, including

public boolean add (E e)

3. In addition to implementing the

public boolean add (E e)

2 interface, this class provides methods to manipulate the size of the array that is used internally to store the list. (This class is roughly equivalent to

public boolean add (E e)

5, except that it is unsynchronized.)

The

public boolean add (E e)

6,

public boolean add (E e)

7,

public boolean add (E e)

8,

public boolean add (E e)

9,

public void add (int index,

            E element)

0, and

public void add (int index,

            E element)

1 operations run in constant time. The

public void add (int index,

            E element)

2 operation runs in amortized constant time, that is, adding n elements requires O(n) time. All of the other operations run in linear time (roughly speaking). The constant factor is low compared to that for the

public void add (int index,

            E element)

3 implementation.

Each

public void add (int index,

            E element)

4 instance has a capacity. The capacity is the size of the array used to store the elements in the list. It is always at least as large as the list size. As elements are added to an ArrayList, its capacity grows automatically. The details of the growth policy are not specified beyond the fact that adding an element has constant amortized time cost.

An application can increase the capacity of an

public void add (int index,

            E element)

4 instance before adding a large number of elements using the

public void add (int index,

            E element)

6 operation. This may reduce the amount of incremental reallocation.

Note that this implementation is not synchronized. If multiple threads access an

public void add (int index,

            E element)

4 instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.) This is typically accomplished by synchronizing on some object that naturally encapsulates the list. If no such object exists, the list should be "wrapped" using the

public void add (int index,

            E element)

8 method. This is best done at creation time, to prevent accidental unsynchronized access to the list:

List list = Collections.synchronizedList(new ArrayList(...));

The iterators returned by this class's

public void add (int index,

            E element)

9 and

public boolean addAll (Collection c)

0 methods are fail-fast: if the list is structurally modified at any time after the iterator is created, in any way except through the iterator's own

public boolean addAll (Collection c)

1 or

public boolean addAll (Collection c)

2 methods, the iterator will throw a

public boolean addAll (Collection c)

3. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future.

Note that the fail-fast behavior of an iterator cannot be guaranteed as it is, generally speaking, impossible to make any hard guarantees in the presence of unsynchronized concurrent modification. Fail-fast iterators throw

public boolean addAll (Collection c)

4 on a best-effort basis. Therefore, it would be wrong to write a program that depended on this exception for its correctness: the fail-fast behavior of iterators should be used only to detect bugs.

This class is a member of the .

Summary

Inherited fields

From class

public boolean addAll (Collection c)

5

public boolean addAll (Collection c)

6

public boolean addAll (Collection c)

7

The number of times this list has been structurally modified.

Public constructors

public boolean addAll (Collection c)

8

Constructs an empty list with the specified initial capacity.

public boolean addAll (Collection c)

9

Constructs an empty list with an initial capacity of ten.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

0

Constructs a list containing the elements of the specified collection, in the order they are returned by the collection's iterator.

Public methods

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

2

Appends the specified element to the end of this list.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

3

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

4

Inserts the specified element at the specified position in this list.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

6

Appends all of the elements in the specified collection to the end of this list, in the order that they are returned by the specified collection's Iterator.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

8

Inserts all of the elements in the specified collection into this list, starting at the specified position.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

3

public void clear ()

0

Removes all of the elements from this list.

public void clear ()

1

public void clear ()

2

Returns a shallow copy of this

public void add (int index,

            E element)

4 instance.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public void clear ()

5

Returns

public void clear ()

6 if this list contains the specified element.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

3

public void clear ()

8

Increases the capacity of this

public void add (int index,

            E element)

4 instance, if necessary, to ensure that it can hold at least the number of elements specified by the minimum capacity argument.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public Object clone ()

1

Compares the specified object with this list for equality.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

3

public Object clone ()

3

public Object clone ()

4

public Object clone ()

5

Returns the element at the specified position in this list.

public Object clone ()

6

public Object clone ()

7

Returns the hash code value for this list.

public Object clone ()

6

public Object clone ()

9

Returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public ArrayList (int initialCapacity)

01

Returns

public void clear ()

6 if this list contains no elements.

public ArrayList (int initialCapacity)

03

public ArrayList (int initialCapacity)

04

Returns an iterator over the elements in this list in proper sequence.

public Object clone ()

6

public ArrayList (int initialCapacity)

06

Returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element.

public ArrayList (int initialCapacity)

07

public ArrayList (int initialCapacity)

08

Returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list.

public ArrayList (int initialCapacity)

07

public ArrayList (int initialCapacity)

10

Returns a list iterator over the elements in this list (in proper sequence).

public Object clone ()

4

public ArrayList (int initialCapacity)

12

Removes the element at the specified position in this list.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public ArrayList (int initialCapacity)

14

Removes the first occurrence of the specified element from this list, if it is present.

public boolean addAll (int index,

            [Collection](https://developer.android.com/reference/java/util/Collection) c)

1

public ArrayList (int initialCapacity)

16

Removes from this list all of the elements whose index is between

public ArrayList (int initialCapacity)

35, inclusive, and

public ArrayList (int initialCapacity)

36, exclusive. Shifts any succeeding elements to the left (reduces their index). This call shortens the list by

public void add (int index,

            E element)

45 elements. (If

public void add (int index,

            E element)

46, this operation has no effect.)

How do I add an ArrayList to another ArrayList?

If we have a Collection and need to add all its elements to another ArrayList at a particular index, then the addAll(int index, Collection c) method can be used. This method inserts all of the specified collection elements into this list, starting at the specified position.

How do I combine two ArrayLists?

Approach: ArrayLists can be joined in Java with the help of Collection. addAll() method. This method is called by the destination ArrayList and the other ArrayList is passed as the parameter to this method. This method appends the second ArrayList to the end of the first ArrayList.

How to merge ArrayList in Android?

Using List. addAll() The addAll() method is the simplest way to append all of the elements from the given list to the end of another list. Using this method, we can combine multiple lists into a single list.

How do I clone an ArrayList to another ArrayList?

The clone() method of the ArrayList class is used to clone an ArrayList to another ArrayList in Java as it returns a shallow copy of its caller ArrayList. Syntax: public Object clone(); Return Value: This function returns a copy of the instance of Object.