Java HashMap iterator and example

In this Java tutorial, we will see how to use the iterator interface with HashMap. We will create an example to display the contents of the HashMap.

 
 

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Java HashMap iterator and example

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In this Java tutorial, we will see how to use the iterator interface with HashMap. We will create an example to display the contents of the HashMap.

  • Java HashMap Iterator is an interface. It keeps the data in the key and value form.
  • It is implemented by HashMap. hashMap doesnot have iterator method.
  • So use the entrySet() method to get the data in Set object form.
  • Set's all elements can be traversed by the Iterator.


Example of Java HashMap Iterator
import java.util.*;

public class hashmap {
	public static void main(String[] args) {
		HashMap hash = new HashMap();
		hash.put("roll", new Integer(12));
		hash.put("name", "jack");
		hash.put("age", 22);
		Set s = hash.entrySet();
		Iterator i = s.iterator();
		while (i.hasNext()) {
			System.out.println(i.next());
		}
	}
}

Output

roll=12 age=22 name=jack

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