| Method |
Description |
Return Type |
| clear() |
Remove all entries from the map. |
void |
| clone() |
Create a copy of the HashMap. |
Object |
| compute() |
Compute a value for an entry based on its key and the current value (if it has one) |
V |
| computeIfAbsent() |
Compute a value for an entry based on its key only if an entry using the key does not already exist |
V |
| computeIfPresent() |
Compute a new value for an entry based on its key and current value but only if an entry with the key already exists |
V |
| containsKey() |
Indicate if an entry with the specified key exists in the map |
boolean |
| containsValue() |
Indicate if an entry with the specified value exists in the map |
boolean |
| entrySet() |
Return a set of all entries in the map |
Set< Map.Entry<K,V> > |
| forEach() |
Perform an action on every entry in the map |
void |
| get() |
Return the value of the entry with a specified key |
V |
| getOrDefault() |
Return the value of the entry with a specified key or a default value if the entry is not found |
V |
| isEmpty() |
Indicate whether the map is empty |
boolean |
| keySet() |
Return a set of all keys in the map |
Set<K> |
| merge() |
Compute a value for an entry based on its key and value or write a specific value if the entry does not yet exist |
V |
| put() |
Write an entry into the map |
V |
| putAll() |
Write all of the entries from another map into this one |
void |
| putIfAbsent() |
Write an entry into the map but only if an entry with the same key does not already exist |
V |
| remove() |
Remove an entry from the map |
V|boolean |
| replace() |
Write to an entry in the map only if it exists |
V|boolean |
| replaceAll() |
Replaces the value of every entry with the result of an operation |
void |
| size() |
Return the number of entries in the map |
int |
| values() |
Return a collection containing all of the values in the map |
Collection<V> |
