单选题

下面java代码的输出为?

Question

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")
  }
}

A. 1=wangyi

B. 1=163

C. 1=

D. 编译出错