Iterator In Java Example

Chapter: Collections Last Updated: 22-07-2016 07:47:15 UTC

Program:

            /* ............... START ............... */
                
import java.util.ArrayList;
import java.util.Iterator;

public class JavaIteratorExample {
	public static void main(String[] args) {
		ArrayList<String> arrayList = new ArrayList<String>();

		arrayList.add("Java");
		arrayList.add("C");
		arrayList.add("C#");
		arrayList.add("Phython");

		Iterator itr = arrayList.iterator();
		while (itr.hasNext()) {
			String str = (String) itr.next();
			System.out.println(str + " ");
		}

	}
}

                /* ............... END ............... */
        

Output

Java 
C 
C# 
Phython 

Notes:

  • Iterator enables you to cycle through a collection, obtaining or removing elements.
  • boolean hasNext( ) -Returns true if there are more elements. Otherwise, returns false.
  • Object next( ) -Returns the next element. Throws NoSuchElementException if there is not a next element.
  • void remove( ) - Removes the current element. Throws IllegalStateException if an attempt is made to call remove( ) that is not preceded by a call to next( ).

Tags

Collection, Iterator, Java

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