Lazy field initialization with lambdas

Question

I would like to implement lazy field initialization (or deferred initialization) without an if statement and taking advantage of lambdas. So, I would like to have the same b

Answer 1

It's supported,

By creating a small interface and combining 2 new features introduced in java 8:

• @FunctionalInterface annotation (allows assigning a lambda on declaration)
• default keyword (define an implementation, just like abstract class - but in an interface)

It is possible to get the same Lazy behavior as you seen in C#.

---

Usage

Lazy name = () -> "Java 8";
System.out.println(name.get());

Lazy.java (copy and paste this interface in somewhere accessible)

import java.util.function.Supplier;

@FunctionalInterface
public interface Lazy extends Supplier {
    abstract class Cache {
        private volatile static Map instances = new HashMap<>();

        private static synchronized Object getInstance(int instanceId, Supplier