Program: How to iterate through TreeMap?

Below example shows how to iterate through all entries from the TreeMap. First you can get all keys by calling keySet() method, which returns list of keys as Set object. By going through each element in the set, you can get corresponding values from TreeMap.

package com.java2novice.treemap;

import java.util.Set;
import java.util.TreeMap;

public class MyTreeMapRead {

	public static void main(String a[]){
		TreeMap<String, String> hm = new TreeMap<String, String>();
		//add key-value pair to TreeMap
		hm.put("first", "FIRST INSERTED");
		hm.put("second", "SECOND INSERTED");
		hm.put("third","THIRD INSERTED");
		System.out.println(hm);
		Set<String> keys = hm.keySet();
		for(String key: keys){
			System.out.println("Value of "+key+" is: "+hm.get(key));
		}
	}
}

{first=FIRST INSERTED, second=SECOND INSERTED, third=THIRD INSERTED}
Value of first is: FIRST INSERTED
Value of second is: SECOND INSERTED
Value of third is: THIRD INSERTED