Iterator1.java

package August;
import java.util.ArrayList;
import java.util.Iterator;

public class Iterator1 {

	public static void main(String[] args) {
		// Creating an ArrayList class object
        // Declaring object of integer type
        ArrayList<Integer> al = new ArrayList<Integer>();
 
        // Iterating over the List
        for (int i = 0; i < 10; i++)
            al.add(i);
 
        // Printing the elements in the List
        System.out.println(al);
     
        // At the beginning itr(cursor) will point to
        // index just before the first element in al
        Iterator<Integer> itr = al.iterator();
 
        // Checking the next element  where
        // condition holds true till there is single element
        // in the List using hasnext() method
        while (itr.hasNext()) {
            //  Moving cursor to next element
            int i = itr.next();
 
            // Getting elements one by one
            System.out.print(i + " ");
 
            // Removing odd elements
            if (i % 2 != 0)
                itr.remove();
        }
 
        // Command for next line
        System.out.println();
 
        // Printing the elements inside the object
        System.out.println(al);
        
        ArrayList a = new ArrayList();
        for (int i = 0; i < 10; i++) {
            a.add(i);
        }
        System.out.printf("BEFORE ITERATOR\n");
        for (int i = 0; i < a.size(); i++) {
            System.out.printf("I:%d\n", a.get(i));
        }
        System.out.printf("AFTER ITERATOR\n");
        Iterator i = a.iterator();
        while (i.hasNext()) {
            System.out.printf("I:%d\n", i.next());
            
          }   
            
            ArrayList<String> names = new ArrayList<String>();
            names.add("Alice");
            names.add("Bob");
            names.add("Charlie");
            names.add("David");
     
            // Creating an iterator for the names list
            Iterator<String> iterator = names.iterator();
     
            // Iterating over the names list using the iterator
            while (iterator.hasNext()) {
                System.out.println(iterator.next());
            
            }

	}

}