how to get name and value of each parametes in java method?

I would like to get the name of each parameter and value coming to my method in java. I searched about it but I could not find something to help me. Can you show me a solution. I have a method as below

public HashMap<String, Object> putallinMap(Object...pars){
     HashMap<String, Object> map = new HashMap<String, Object>();
     map.put(pars[0].{name}, pars[0].{value});
     return map;
}

This is How I call the method above.

String str1 = "Hello world!";
int myint = 55;
double myDouble = 11.5;
...// there can be other primitive types, long, short, Double etc.

HashMap<String, Object> map attrInMap = putallinMap(str1, myint, myDouble);

Sow What I expect to have a hasmap like below.

{"str1":"Hello world!", "myint" : 55, "myDouble": 11.5}