Java Se Development Kit 8 _top_ (2024)

// Lambda + Stream API + Method Reference double averageSalary = employees.stream() .filter(e -> Period.between(e.hireDate(), LocalDate.now()).getYears() >= 3) .mapToDouble(Employee::salary) .average() .orElse(0.0);

List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "David"); // Filter, transform, and collect in one pipeline List<String> longNames = names.stream() .filter(name -> name.length() > 4) .map(String::toUpperCase) .collect(Collectors.toList()); // Result: ["CHARLIE", "DAVID"] A complete overhaul of date/time handling, replacing the notoriously flawed java.util.Date and Calendar classes. Inspired by Joda-Time, it is immutable, thread-safe, and intuitive. java se development kit 8

// Before: Mutable, confusing months (0-indexed) Calendar cal = Calendar.getInstance(); cal.set(2014, 2, 18); // March 18, 2014 // After: Clear, immutable, fluent LocalDate date = LocalDate.of(2014, Month.MARCH, 18); LocalDateTime meeting = LocalDateTime.now() .plusDays(3) .withHour(14) .truncatedTo(ChronoUnit.HOURS); Replaced Rhino as Java's embedded JavaScript engine, offering better performance and ECMAScript 5.1 compliance. While later deprecated in JDK 11, it was a major feature for polyglot applications. 5. Optional Class A container object that may or may not contain a non-null value. Encourages better null handling and reduces NullPointerException . // Lambda + Stream API + Method Reference