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What will be the output of the following program?

import java.util.*;

public class HashTable
{
    public static void main(String a[])
    {
        Hashtable<String, String> hashtable = new Hashtable<String, String>();
        hashtable.put("first", "1");
        hashtable.put("second", "2");
        hashtable.put("third", "3");
        hashtable.put("third", "4");
        hashtable.put("five", "5");
        hashtable.put("six", "5");
        
        List<String> list = new ArrayList<String>(hashtable.keySet());
        Collections.sort(list);

        for(String key : list)
        {
            System.out.println(key + " -> " + hashtable.get(key));
        }
    }
}


first -> 1
five -> 5
second -> 2
six -> 5
third -> 3
first -> 1
five -> 5
second -> 2
six -> 5
third -> 4
first -> 1
second -> 2
third -> 4
five -> 5
six -> 5
first -> 1
second -> 2
third -> 3
third -> 4
five -> 5
six -> 5
Compilation Error or Runtime Error

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Topic: Java Hashtable

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