Simple != Simple to use

BadCrawler.java

public class BatchCrawler {

    public BatchCrawler(Job job) {
        this.job = job;
        this.timeout = ConfigurationService.getInt(SCAN_TIMEOUT);
        httpCrawler = new RetryingHttpCrawler();
    }
    
    public CrawlResult crawl() {
        CrawlResult crawlResult = new CrawlResult();
        for (Url url : job.getUrls()) {
            Page page = httpCrawler.visit(url, timeout);
            result.add(url, page.content());
        }
        return crawlResult;
    }

BetterConstructor.java

public BatchCrawler(Job job, int timeout, Crawler crawler) {
    this.job = job;
    this.timeout = timeout;
    this.crawler = crawler;
}

FactoryMethod.java

public static retryingBatchCrawlerWithSystemConfig(Job job) {
    int timeout = ConfigurationService.getInt(SCAN_TIMEOUT);
    int[] retryintervals = ConfigurationService.getIntArray(RETRY_INTERVALS);
    Crawler retryingHttpCrawler = new RetryingHttpCrawler(retryIntervals); 
    return new BatchCrawler(job, timeout, retryingHttpCrawler)
}