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JavaIntermediate#concurrency
JavaIntermediate#java8
What is Optional?
A container introduced in Java 8 to represent possibly-absent values, avoiding NullPointerExceptions. Provides methods like isPresent, ifPresent, orElse, map, flatMap.
Example
Optional<String> name = Optional.ofNullable(getName());
String result = name.map(String::toUpperCase).orElse("UNKNOWN");