Java List Interface

List Interface is the subinterface of Collection.It contains methods to insert and delete elements in index basis.It is a factory of ListIterator interface.

Commonly used methods of List Interface:

1. public void add(int index,Object element);
2. public boolean addAll(int index,Collection c);
3. public object get(int Index position);
4. public object set(int index,Object element);
5. public object remove(int index);
6. public ListIterator listIterator();
7. public ListIterator listIterator(int i);

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Java ListIterator Interface

ListIterator Interface is used to traverse the element in backward and forward direction.

Commonly used methods of ListIterator Interface:

1. public boolean hasNext();
2. public Object next();
3. public boolean hasPrevious();
4. public Object previous();

Example of ListIterator Interface:

1. import java.util.*;  
2. public class TestCollection8{  
3. public static void main(String args[]){  
4.   
5. ArrayList<String> al=new ArrayList<String>();  
6. al.add("Amit");  
7. al.add("Vijay");  
8. al.add("Kumar");  
9. al.add(1,"Sachin");  
10.   
11. System.out.println("element at 2nd position: "+al.get(2));  
12.   
13. ListIterator<String> itr=al.listIterator();  
14.   
15. System.out.println("traversing elements in forward direction...");  
16. while(itr.hasNext()){  
17. System.out.println(itr.next());  
18.  }  
19.   
20.   
21. System.out.println("traversing elements in backward direction...");  
22. while(itr.hasPrevious()){  
23. System.out.println(itr.previous());  
24.  }  
25. }  
26. }

Output:element at 2nd position: Vijay
       traversing elements in forward direction...
       Amit
       Sachin
       Vijay
       Kumar
       traversing elements in backward direction...
       Kumar
       Vijay
       Sachin
       Amit