Java.util Optional is a class used to represent objects that may or may not exist. It is a container object that may or may not contain a non-null value. Optional is primarily used to avoid null pointer exceptions. It was introduced in Java 8 as a part of the Java util package.
Code examples:
1. Creating an Optional object with a non-null value: Optional optional = Optional.of("Hello World");
2. Creating an empty Optional object: Optional optional = Optional.empty();
3. Checking if an Optional object contains a value: if (optional.isPresent()) { // Do something with the value }
4. Getting the value of an Optional object: String value = optional.get();
5. Providing a default value if an Optional object is empty: String value = optional.orElse("Default Value");
6. Mapping the value of an Optional object to another value: String value = optional.map(str -> str.toUpperCase()).orElse("Default Value");
In Java, the Optional class is a part of the java.util package library.
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