April 21, 2026 - If a value is present, apply the provided Optional-bearing mapping function to it, return that result, otherwise return an empty Optional.

February 15, 2026 - We will look at the map() method in detail in the next section. First of all, if a null object is passed to this method, we don’t expect any problem. Secondly, the only logic we write inside its body is exactly what the method name describes — price-range check. Optional takes care of the rest:

an Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise an empty Optional

April 21, 2026 - If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.

July 10, 2023 - If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.

If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.

December 12, 2022 - If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.

Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed.

April 21, 2026 - Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that (key==null ? k==null : key.equals(k)), that mapping is removed.

January 20, 2026 - Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed.

January 20, 2026 - This method is similar to map(Function), but the mapping function is one whose result is already an Optional, and if invoked, flatMap does not wrap it within an additional Optional.

an Optional describing the result of applying a mapping function to the value of this Optional, if a value is present, otherwise an empty Optional

January 20, 2026 - If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.

The map method of the Java Optional class is a powerful tool for performing operations on the value inside an Optional container in a null-safe way. It allows you to chain multiple operations and handle null values gracefully.

Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed.

If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.

March 16, 2026 - Attempts to compute a mapping for the specified key and its current mapped value, or null if there is no current mapping (optional operation). ... If the specified key is not already associated with a value (or is mapped to null), attempts to compute its value using the given mapping function ...

January 20, 2026 - Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed.

Removes the mapping for a key from this map if it is present (optional operation). More formally, if this map contains a mapping from key k to value v such that Objects.equals(key, k), that mapping is removed.

If a value is present, returns an Optional describing (as if by ofNullable(T)) the result of applying the given mapping function to the value, otherwise returns an empty Optional.