import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;
public class MapTest {
public static void main(String[] args) {
Map<String, Integer> map = new HashMap<String, Integer>();
map.put("a", 1);
map.put("b", 2);
map.put("a", 2);
Set<Entry<String, Integer>> set = map.entrySet();
for(Iterator<Entry<String, Integer>> it = set.iterator();it.hasNext();){
Entry<String, Integer> entry = it.next();
System.out.println(entry.getKey()+" "+entry.getValue());
}
System.out.println(map.size());
}
}