下面java代码的输出为?
import java.util.HashMap;
import java.util.Iterator;
public class Main {
public static void main(String[] args) {
HashMap map = new HashMap<Integer, Integer>();
map.put(1, "wangyi");
changeHashMap(map);
for (Iterator it = map.keySet().iterator(); it.hasNext();) {
Object key = it.next();
System.out.println(key + "=" + map.get(key));
}
}
static void changeHashMap(HashMap map) {
map = new HashMap<Integer, String>();
map.put(1, "163");
}
} 
