import java.util.*;

public class MapExample{
	
	public static void main(String[] args){
		Map m = new HashMap();
		m.put("Ke Wang", "kw2036");
		m.put("Sal Stolfo", "ss32");
		m.put("Mike Jordan", "mj1");		
		System.out.println(m);
		
		Iterator iter = m.keySet().iterator();
		while(iter.hasNext()){
			String name = (String)iter.next();
			String account = (String)m.get(name);
			System.out.print(name+"-"+account+" ");				
		}
		System.out.println();
		
		m = new TreeMap();
		m.put("Ke Wang", "kw2036");
		m.put("Sal Stolfo", "ss32");
		m.put("Mike Jordan", "mj1");		
		System.out.println(m);
		
		m = new LinkedHashMap();
		m.put("Ke Wang", "kw2036");
		m.put("Sal Stolfo", "ss32");
		m.put("Mike Jordan", "mj1");		
		System.out.println(m);
				
	}	
}