Java10で匿名クラス遊び

Main.java

import java.util.List;

import static java.util.stream.Collectors.toList;

// I've referenced this post:
// https://developer.oracle.com/java/jdk-10-local-variable-type-inference
public class Main {

  public static void main(String[] args) {
    var products = List.of(
        new Product("Apple", 100, 3),
        new Product("Orange", 50, 10),
        new Product("Peach", 200, 6));

    var reports = products.stream()
        .map(p -> new Object() {
          String name = p.name;
          int total = p.price * p.count;
        }).collect(toList());

    reports.forEach(r ->
        System.out.println("name = " + r.name + ", total = " + r.total));
  }

  private static class Product {
    String name;
    int price;
    int count;

    Product(String name, int price, int count) {
      this.name = name;
      this.price = price;
      this.count = count;
    }
  }
}

name = Apple, total = 300
name = Orange, total = 500
name = Peach, total = 1200

Process finished with exit code 0