java - Replace String values with value in Hash Map -

i'm new java programming. have created hash map contains key value pairs utilize in replacing user input value corresponding respective key.

i.e.

        hashmap<string,string> questionkey = new hashmap<>();                        (item : itemset()) {              questionkey.put(string.valueof(item.getorder()+1), item.getkey());                                          }                             string list = commandobject.getobjectitem().getlist();          if (list.contains("q")){                             list.replaceall("q01", questionkey.get("1"));                            commandobject.getobjectitem().setlist(list);         }              

i using in formula evaluation

note: users given formula specific way of entry (value1 + value2 + value3)

i'm taking (value1 value2 value3) , converting (value1key value2key value3key)

update:

the question understand better meant to better understand how utilize hashmap in order evaluate user input. more clear question

what best approach evaluate expression i.e.

user input = "var1 + var2"

expected value: valueof(var1) + valueof(var2)

?

@test public void testsomething() {     string str = "hello ${mykey1}, welcome stack overflow. have nice ${mykey2}";     map<string, string> map = new hashmap<string, string>();     map.put("mykey1", "dd84");     map.put("mykey2", "day");     (map.entry<string, string> entry : map.entryset()) {         str = str.replace("${" + entry.getkey() + "}", entry.getvalue());     }     system.out.println(str);         } 

output:

hello dd84, welcome stack overflow. have nice day

for more complex i'd rather use ognl.