Jmeter - Creating a new variable if variable already exists using Java -

i'm using jmeter , want use java update variables,

i have variable called xxvono stores values , adds number suffix when executed in loop. example:

xxvono_1 = value1  xxvono_2 = value2  xxvono_3 = value3 

these variables contains values automatically stored when loop executed. however, trying make code checks if variable empty or not, if true, save new values, if false, create new variable (xxvono_4) , save value there without overwriting existing variables.

how go doing this? use while loop?

if (vars.get("vono_2") != "") {     if (vars.get("xxvono_" + vars.get("aps200_count_3")) == "") {         vars.put("xxvono_" + vars.get("aps200_count_3"), vars.get("vono_2"));         vars.put("xxjrno_" + vars.get("aps200_count_3"), vars.get("jrno_2"));     } else {         while (vars.get("xxvono_" + vars.get("aps200_count_3")) != "") {             vars.put("new_count", vars.get("aps200_count_3"));             integer temp = integer.parseint(vars.get("new_count")) + 1;             vars.put("new_count", temp.tostring());                  }         vars.put("xxvono_" + vars.get("new_count"), vars.get("vono_2"));         vars.put("xxjrno_" + vars.get("new_count"), vars.get("jrno_2"));     } } 

you can try using map instead of creating variables @ runtime

map<string,object> map = new hashmap<>(); 

inside loop

if(map.get("dynamicvariablename")!=null){     map.put("dynamicvariablename"+autogeneratednumbersuffix,valuetobestored) } else{ map.put("dynamicvariablename",valuetobestored) }