how?

Question

how can i make it that the first names (the keys) will stay as they are and the family names (the values) will change?
i tried to do something like that (but it takes the same value and sets all the keys to tha same values) :
import java.util.*;
import java.util.stream.*;
public class Main
{
public static void main(String[] args) {
HashMap <String , String> h = new HashMap <>();
h.put ("Rody" , "Ricch");
h.put ("Travis" , "Scott");
ArrayList <String> k = new ArrayList <> (h.keySet()); //takes all the hashmap's keys
if (k.size() % 2 == 0){
ArrayList <String> v = new ArrayList <> (h.values()); //takes all the hashmap's values
Collections.shuffle(v); //shuffling the values
HashMap <Object , Object> NewH = new HashMap <>();
for (Object i : k){
for (Object j : v){
NewH.put (i , j);
}
}
System.out.println(NewH);
} //end if statement
}
}

Answer 1

Hello yahel
Let's take this example:
h.put("Rody", "Ricch");
If you want to change "Ricch" you need to overwrite the key and the value. Means you add the same key with a different value to the map:
h.put("Rody", "Smith");
Maybe it helps to explain what you really want to do with your program.