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AbstractList iterator() method in Java with Examples

  • Difficulty Level : Basic
  • Last Updated : 26 Nov, 2018

The iterator() method of java.util.AbstractList class is used to return an iterator over the elements in this list in proper sequence.

This implementation returns a straightforward implementation of the iterator interface, relying on the backing list’s size(), get(int), and remove(int) methods.

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Syntax:

public Iterator iterator()

Returns Value: This method returns an iterator over the elements in this list in proper sequence.



Below are the examples to illustrate the iterator() method.

Example 1:




// Java program to demonstrate
// iterator() method
// for Integer value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        try {
  
            // Creating object of AbstractList<Integer>
            AbstractList<Integer>
                arrlist1 = new ArrayList<Integer>();
  
            // Populating arrlist1
            arrlist1.add(10);
            arrlist1.add(20);
            arrlist1.add(30);
            arrlist1.add(40);
            arrlist1.add(50);
  
            // print arrlist1
            System.out.println("ArrayList : "
                               + arrlist1);
  
            // creating object of Iterator
            // using iterator() method
            Iterator it = arrlist1.iterator();
  
            // printing the iterated value
            while (it.hasNext()) {
                System.out.println("Value is : "
                                   + it.next());
            }
        }
  
        catch (NullPointerException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
ArrayList : [10, 20, 30, 40, 50]
Value is : 10
Value is : 20
Value is : 30
Value is : 40
Value is : 50

Example 2:




// Java program to demonstrate
// iterator() method
// for String value
  
import java.util.*;
  
public class GFG1 {
    public static void main(String[] argv)
        throws Exception
    {
  
        try {
  
            // Creating object of AbstractList<String>
            AbstractList<String>
                arrlist1 = new ArrayList<String>();
  
            // Populating arrlist1
            arrlist1.add("A");
            arrlist1.add("B");
            arrlist1.add("C");
            arrlist1.add("D");
            arrlist1.add("E");
  
            // print arrlist1
            System.out.println("ArrayList : "
                               + arrlist1);
  
            // creating object of Iterator
            // using iterator() method
            Iterator it = arrlist1.iterator();
  
            // printing the iterated value
            while (it.hasNext()) {
                System.out.println("Value is : "
                                   + it.next());
            }
        }
  
        catch (NullPointerException e) {
            System.out.println("Exception thrown : " + e);
        }
    }
}
Output:
ArrayList : [A, B, C, D, E]
Value is : A
Value is : B
Value is : C
Value is : D
Value is : E



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