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.
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