如何编写一个接受不同对象类型但在Java中执行相同操作的函数

Question

I am using import org.apache.http.client.methods.HttpPut and HttpGet to form the headers of my put and get requests. A lot of the headers to be added in these methods are same and I want to avoid writing the same code in both my put and get functions. Is there a way to have a function which accepts both HttpPut or HttpGet objects as parameters and will be able to add headers? For example:

HttpGet get= new HttpGet(url);
get = addHeaders(get);
get.setHeader();//custom headers for get requests

HttpPut put = new HttpPut(url);
put = addHeaders(put);

Object addHeaders(Object x) {
   x.setHeader();//add the common headers
   return x;
}

What is the best way to do this?

Answer 1

both HttpGet and HttpPost has implements the HttpMessage interface which contains a method setHeader() so

public void setHeader(HttpMessage msg){
      msg.setHeader("xxxx");
}

will do the trick.

Answer 2

HttpMessage is the parent of HttpGet and HttpPut .

Try this

HttpMessage addHeaders(HttpMessage x) {
   x.setHeader();//add the common headers
   return x;
}