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

How about this? then you can do something like this by using LazyInitializer from Apache Commons: https://commons.apache.org/proper/commons-lang/javadocs/api-3.1/org/apache/commons/lang3/concurrent/LazyInitializer.html

private static Lazy _lazyDouble = new Lazy<>(()->1.0);

class Lazy extends LazyInitializer {
    private Supplier builder;

    public Lazy(Supplier builder) {
        if (builder == null) throw new IllegalArgumentException();
        this.builder = builder;
    }
    @Override
    protected T initialize() throws ConcurrentException {
        return builder.get();
    }
}