notes/pl/java/features/lambda/lazy.txt

sample
    public static class SomeResponseSupplier {
        private final Supplier<SomeResponse> supplier;
        private TxCardResponse data;

        public SomeResponseSupplier(Supplier<SomeResponse> supplier) {
            this.supplier = supplier;
        }

        public SomeResponse get() {
            if (data != null) {
                return data;
            }
            return data = supplier.get();
        }
    }