Resolver for Engineer Puzzle 6 (http://tango-ruby.hatenablog.com/entry/2016/02/14/222943)

Resolver.java

package com.company;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.logging.*;

/**
 * Resolve http://tango-ruby.hatenablog.com/entry/2016/02/14/222943
 */
public class Resolver {

    static final Logger logger = Logger.getLogger(Resolver.class.getName());

    public static void main(String[] args) {
        setupLogger();
        logger.info("Hello");

        final Integer numberOfCandies = 2110154;
        final List<Boolean> ateCandies = new ArrayList<>();
        for (Integer i = 0; i < numberOfCandies; i++) {
            ateCandies.add(false);
        }

        final Integer stepCounts = 166;
        Integer i = 0;
        while (!ateCandies.get(i)) {
            ateCandies.set(i, true);
            i = (i + stepCounts) % numberOfCandies;
        }

        logger.info("Count: " + ateCandies.stream().filter(ate -> ate).count());
    }

    private static void setupLogger() {
        ConsoleHandler consoleHandler = new ConsoleHandler();
        consoleHandler.setLevel(Level.INFO);
        consoleHandler.setFormatter(new MyFormatter());
        logger.addHandler(consoleHandler);
        logger.setUseParentHandlers(false);
    }
}

class MyFormatter extends Formatter {
    // Create a DateFormat to format the logger timestamp.
    private static final DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss.SSS");

    public String format(LogRecord record) {
        StringBuilder builder = new StringBuilder(1000);
        builder.append(df.format(new Date(record.getMillis())));
        builder.append(" ").append(record.getLevel()).append(" ");
        builder.append("[").append(record.getSourceClassName()).append(".");
        builder.append(record.getSourceMethodName()).append("] ");
        builder.append(formatMessage(record));
        builder.append("\n");
        return builder.toString();
    }

    public String getHead(Handler h) {
        return super.getHead(h);
    }

    public String getTail(Handler h) {
        return super.getTail(h);
    }
}