how can we change the either value or key of the hash map?

Question

Suppose that we have a Hash Map with some key value pair and we want to modify either key or value of the Hash Map .So how can we do this?

Answer 1

For changing the value just use

map.put(key,newValue);

for changing the key use

ValueType value = map.get(oldKey);
map.remove(oldKey);
map.put(newKey, value);