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Java Map Iterate

In this section of tutorial we will learn how to use the Map with the Iterator interface. We will create an example to display the contents of the map using Iterator

  • Map is an Interface in the Collection Framework.
  • Map is implemented by its two sub classes
    • HashMap
    • Treemap
  • Map has no iterator method.
  • So use the entrySet() method.It returns the data as Set

Example of Java Map Iterate
import java.util.*;

public class map1 {
	public static void main(String[] args) {
		Map map = new TreeMap();
		char grade[] = { 'a', 'b', 'c', 'd' };
		int x = 1;

		for (char c : grade) {
			map.put(x, c);
		Set s = map.entrySet();
		Iterator i = s.iterator();
		while (i.hasNext()) {

Output :

1=a 2=b 3=c 4=d


Posted on: November 4, 2009 If you enjoyed this post then why not add us on Google+? Add us to your Circles

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