MAP List Iterator, Java

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//Title of this code
//'main' method must be in a class 'Rextester'.

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        System.out.println("Hello, World!");
        List<String> lst = new ArrayList<String>();
        lst.add("a");
        lst.add("b");
        lst.add("c");
        
        System.out.println("FOR");
        for(String obj : lst)
        {
            System.out.println(obj);
        }
        
        System.out.println("ITERATOR");
        Iterator<String> itr = lst.iterator();
        while(itr.hasNext()){
            System.out.println(itr.next());
        }
        
        Map<String,String> mp = new HashMap<String,String>();
        mp.put("1","a");
        mp.put("2","b");
        mp.put("3","c");
        
        Set<String> s = mp.keySet();
        for(String o:s)
        { System.out.println(o);
        }
        Collection<String> s1 = mp.values();
        for(String o1:s1)
        { System.out.println(o1);
        }
        Iterator<Map.Entry<String,String>> me = mp.entrySet().iterator();
        while(me.hasNext())
        {   
            Map.Entry<String,String> entry = me.next();
            String key = entry.getKey();
            String value = entry.getValue();
            System.out.println("key "+key+" value "+value);
            
        }
    }
}

[ + ] Show input
Compilation time: 0.84 sec, absolute running time: 0.13 sec, cpu time: 0.07 sec, memory peak: 14 Mb, absolute service time: 0.98 sec