java 8 features

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🔥 Top Java 8 Features You Must Know [With Examples]

Java 8 introduced powerful features that revolutionized how we write Java code. It was a major release aimed at simplifying development and improving performance with a focus on functional programming, streams, and API enhancements.

✅ 1. Lambda Expressions

Keyword: Java 8 lambda expression example

Lambda expressions allow you to write anonymous functions. It helps reduce boilerplate code especially in collection iterations.

List<String> list = Arrays.asList("A", "B", "C");

list.forEach(item -> System.out.println(item));

✅ 2. Functional Interfaces

Keyword: @FunctionalInterface Java 8

An interface with a single abstract method. Used extensively with Lambda.

@FunctionalInterface

interface MyFunction {

    void execute();

}

✅ 3. Stream API

Keyword: Java 8 Stream API example

Used to process collections in a functional style: filter, map, reduce, etc.

List<String> names = Arrays.asList("John", "Jane", "Jake");

names.stream()

     .filter(name -> name.startsWith("J"))

     .forEach(System.out::println);

✅ 4. Default Methods in Interfaces

Keyword: Java 8 default method interface

Interfaces can now have method implementations.

interface MyInterface {

    default void show() {

        System.out.println("Default method");

    }

}

✅ 5. Optional Class

Keyword: Java 8 Optional to avoid null

Used to avoid NullPointerException by explicitly handling missing values.

Optional<String> name = Optional.ofNullable(null);

System.out.println(name.orElse("Default Name"));

✅ 6. New Date and Time API (java.time)

Keyword: Java 8 Date and Time API

Modern replacement for Date and Calendar classes.

LocalDate today = LocalDate.now();

LocalDate birthday = LocalDate.of(1996, Month.AUGUST, 5);

✅ 7. Method References

Keyword: Java 8 method reference

A shorthand for calling methods using ::.

list.forEach(System.out::println);

✅ 8. Collectors Class

Keyword: Java 8 Collectors groupingBy

Used to collect stream results into a list, set, map, or even group by.

Map<Integer, List<String>> grouped = names.stream()

    .collect(Collectors.groupingBy(String::length));

✅ 9. Nashorn JavaScript Engine (Deprecated in Java 15)

Keyword: Java 8 Nashorn engine example

Run JavaScript code inside Java applications.

ScriptEngine engine = new ScriptEngineManager().getEngineByName("nashorn");

engine.eval("print('Hello from JavaScript')");

✅ 10. Parallel Streams

Keyword: Java 8 parallel stream example

Enhance performance using multithreading for streams.

list.parallelStream().forEach(System.out::println);