摘要：
首先为了举例方便，先来个java的类package simple.example;class TestWildcard{ private String userName; private String city; private void setUserName(String name) { username = name; } private void setCity(String city) { this.city = city; } public void setInfo(String name, String city) { setUserName(name); setCity(cit 阅读全文
