Iterate HashMap In Java Example

Chapter: Collections Last Updated: 16-04-2016 03:28:05 UTC

Program:

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

public class JavaIterateHashMap {
	public static void main(String[] args) {

		HashMap<Integer, String> hashMap = new HashMap<Integer, String>();
		hashMap.put(new Integer(1), "One");
		hashMap.put(new Integer(2), "Two");
		hashMap.put(new Integer(3), "Three");
		hashMap.put(new Integer(4), "Four");

		Iterator<Integer> it = hashMap.keySet().iterator();
		while (it.hasNext()) {
			Integer key = it.next();
			System.out.println(key + " : " + hashMap.get(key));
		}

		for (Integer key : hashMap.keySet()) {
			System.out.println(key + " : " + hashMap.get(key));
		}

	}
}

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

Output

1 : One
2 : Two
3 : Three
4 : Four
1 : One
2 : Two
3 : Three
4 : Four

Notes:

  • Iterator is an interface which is used to iterate over a collection. Iterator is a replacement of enumeration.
  • Iterator has the ability to remove the elements from the collection during the iteration.
  • We can iterate the collection either with keySet() or entrySet() method of iterator interface.

Tags

Collection, Iterate HashMap, Java

Similar Programs Chapter Last Updated
Java StrictMath Floor() Method Collections 21-08-2017
Java Program To Sort ArrayList In Descending Order Collections 25-06-2016
Add Elements To Hash Map In Java Example Collections 25-06-2016
Synchronized Map In Java Collections 21-06-2016
Synchronized Set In Java Example Collections 21-06-2016
Synchronized List In Java Collections 21-06-2016
Java Vector To Object Array Example Collections 20-05-2016
Java Vector Sub List Example Collections 20-05-2016
Java Vector Sort Example Collections 20-05-2016
Java Vector Size Example Collections 20-05-2016
Java Vector Add Element At Specific Index Collections 20-05-2016
Java Vector Example Collections 20-05-2016
Java TreeSet Value Exists Example Collections 18-05-2016
Java TreeSet To Object Array Collections 18-05-2016
Java TreeSet Tail Set Example Collections 18-05-2016
Java TreeSet Sub Set Example Collections 18-05-2016
Java TreeSet Size Example Collections 18-05-2016
Java TreeSet Remove Specific Element Collections 18-05-2016
Java TreeSet Iterator Example Collections 18-05-2016
Head Set From Java TreeSet Collections 18-05-2016
Java TreeSet First Last Element Collections 18-05-2016
Java TreeSet Example Collections 18-05-2016
Binary Search on Java Short Array Collections 17-05-2016
Binary Search on Java Long Array Collections 17-05-2016
Binary Search on Java Int Array Collections 17-05-2016
Binary Search on Java Float Array Collections 17-05-2016
Binary Search on Java Double Array Collections 17-05-2016
Binary Search on Java Char Array Collections 17-05-2016
Binary Search On Java Byte Array Collections 17-05-2016
Java LinkedHashSet To Object Array Collections 17-05-2016

1 2 3 4