package zzzTest;

import java.util.BitSet;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by nibnait on 2016/10/6.
 */
public class HashMapTest {

    public static void main(String[] args) {

        Map<String, String> map = new HashMap<>();
        map.put("1","11");
        System.out.println(map.get(null));

    }


}