nimcheck/tests/fixtures/java/valid.java

package fixtures;

import java.util.*;
import java.util.stream.*;

public class Valid {
    public static class Person {
        private final int id;
        private final String name;
        private final String email;

        public Person(int id, String name, String email) {
            this.id = id;
            this.name = name;
            this.email = email;
        }

        public int getId() { return id; }
        public String getName() { return name; }
        public String getEmail() { return email; }

        @Override
        public String toString() {
            return name + " <" + email + ">";
        }
    }

    public static class Repository<T> {
        private final Map<Integer, T> items = new HashMap<>();

        public void add(int key, T item) {
            items.put(key, item);
        }

        public Optional<T> find(int key) {
            return Optional.ofNullable(items.get(key));
        }

        public List<T> getAll() {
            return new ArrayList<>(items.values());
        }
    }

    public static int add(int a, int b) {
        return a + b;
    }

    public static void main(String[] args) {
        Repository<Person> repo = new Repository<>();
        repo.add(1, new Person(1, "Alice", "alice@example.com"));
        repo.add(2, new Person(2, "Bob", "bob@example.com"));

        repo.getAll().stream()
            .map(Person::getName)
            .forEach(System.out::println);

        System.out.println("3 + 4 = " + add(3, 4));
    }
}