对象和对象的引用

下列代码运行结果是什么?

public class Demo01 {
    
    public static void main(String[] args) {
        Map<String, Object> map = new HashMap<String, Object>();
        test(map);
        test2(map);
        System.out.println(map);
    }
    
    public static void test(Map<String,Object> map) {
        map.put("msg", "Hello World");
    }
    
    public static void test2(Map<String,Object> map) {
        map = new HashMap<String, Object>();
        map.put("data", "OK");
    }
}

运行结果：
{msg=Hello World}