Java 8 Features

Java 8 introduced several new features that enhance the programming experience and provide more efficient ways of writing code. Two notable features are lambda expressions and streams.

Lambda Expressions

Lambda expressions are anonymous functions that allow you to express instances of single-method interfaces more concisely. They are particularly useful in functional programming and enable you to write more readable and expressive code.

Here's an example of a lambda expression that defines a single method for a functional interface:

1MyInterface myInterface = () -> System.out.println("Hello, World!");
2myInterface.myMethod();

In this example, the lambda expression () -> System.out.println("Hello, World!") defines a method with an empty parameter list and no return type. The myMethod() method of the functional interface MyInterface is then called to execute the lambda expression.

Streams

Streams are a new abstraction introduced in Java 8 that allow for more efficient and expressive ways of manipulating collections of data. They provide a way to perform operations on a collection of data in a pipeline fashion, making code more readable and concise.

Here's an example of using streams to filter and print elements from a list:

1List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "Dave", "Eve");
2names.stream()
3     .filter(name -> name.startsWith("A"))
4     .forEach(System.out::println);

In this example, the stream() method is called on the names list to create a stream. The filter() method is then used to filter the elements based on a condition, and finally the forEach() method is used to print each element that satisfies the condition.

These are just two examples of the many features introduced in Java 8. The new features in Java 8 provide more powerful and concise ways of writing code, making Java a more efficient and expressive language for developers.

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class Main {

  public static void main(String[] args) {

    // replace with your Java logic here

    // Lambda Expression

    MyInterface myInterface = () -> System.out.println("Hello, World!");

    myInterface.myMethod();

​

    // Stream

    List<String> names = Arrays.asList("Alice", "Bob", "Charlie", "Dave", "Eve");

    names.stream()

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

         .forEach(System.out::println);

  }

}

​

interface MyInterface {

  void myMethod();

}