public class Something {
    private Something() {}

    private static class LazyHolder {
        private static final Something INSTANCE = new Something();
    }

    public static Something getInstance() {
        return LazyHolder.INSTANCE;
    }
}

public class Something {
        private Something() {}

        private static final Something INSTANCE = new Something();

        public static Something getInstance() {
            return INSTANCE;
        }
    }