AbstractList class in java
java.util.AbstractList is a class in java programming language. Inside of this class exists 15 public methods. Declaration of this class as follows.
public abstract class java.util.AbstractList <E >
extends java.util.AbstractCollection <E >
implements java.util.List <E > AbstractList public method
There are following useful methods which is define the inside of java.util.AbstractList class.
| Method | Description |
|---|---|
| boolean add(E e) | It appends the specified element to the end of this list (optional operation). |
| void add(int index, E element) | It inserts the specified element at the specified position in this list (optional operation). |
| boolean addAll(int index, Collection c) | It inserts all of the elements in the specified collection into this list at the specified position (optional operation). |
| void clear() | It removes all of the elements from this list (optional operation). |
| boolean equals(Object o) | It compares the specified object with this list for equality. |
| abstract E get(int index) | It returns the element at the specified position in this list. |
| int hashCode() | It returns the hash code value for this list. |
| int indexOf(Object o) | It returns the index of the first occurrence of the specified element in this list, or -1 if this list does not contain the element. |
| Iterator |
It returns an iterator over the elements in this list in proper sequence. |
| int lastIndexOf(Object o) | It returns the index of the last occurrence of the specified element in this list, or -1 if this list does not contain the element. |
| ListIterator |
It returns a list iterator over the elements in this list (in proper sequence). |
| ListIterator |
It returns a list iterator over the elements in this list (in proper sequence), starting at the specified position in the list. |
| E remove(int index) | It removes the element at the specified position in this list (optional operation). |
| protected void removeRange(int fromIndex, int toIndex) | It removes from this list all of the elements whose index is between , inclusive, and toIndex, exclusive. |
| E set(int index, E element) | It replaces the element at the specified position in this list with the specified element (optional operation). |
| List |
It returns a view of the portion of this list between the specified fromIndex, inclusive, and toIndex, exclusive. |
This reference is belong to javadoc.
This is an abstract class so it's not create any instance. But this class variable can hold the reference of subclass instance. Those class is Vector, ArrayList and LinkedList.
Example By using Vector
// Example 1
import java.util.AbstractList;
import java.util.Vector;
public class Example
{
public static void main(String args[])
{
// New empty Vector
AbstractList < String > record = new Vector < String > ();
// Add value
record.add("Write");
record.add("A");
record.add("Code");
System.out.println(record);
}
}
[Write, A, Code]Example By using ArrayList
// Example 2
import java.util.AbstractList;
import java.util.ArrayList;
public class Example
{
public static void main(String args[])
{
// New empty ArrayList
AbstractList < String > record = new ArrayList < String > ();
// Add value
record.add("Write");
record.add("A");
record.add("Code");
System.out.println(record);
}
}
[Write, A, Code]Example By using LinkedList
// Example 3
import java.util.AbstractList;
import java.util.LinkedList;
public class Example
{
public static void main(String args[])
{
// New empty LinkedList
AbstractList < String > record = new LinkedList < String > ();
// Add value
record.add("Write");
record.add("A");
record.add("Code");
System.out.println(record);
}
}
[Write, A, Code]
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