Threads II

Here is another example of threads.
Get the code here.

/**
 * An enum with a single value is probably the ultimate singleton.
 * However, it can get real ugly real soon as far as testability is concerned.
 *
 * @author megha birmiwal
 */

public enum StatisticsCollector {

// can override methods in enums like this

//      INFLATED_STATS

//              public int getTimesCalled() {

//                      return count * 10;

//              }

//      },

        STATS;



        private static int count = 0;

        private static double timeSum = 0;



        synchronized public void reportStat(double time) {

                count++;

                timeSum += time;

        }



        public int getTimesCalled() {

                return count;

        }



        public double getAverage() {

                return timeSum / getTimesCalled();

        }

}

/**
 * Reports a given time to the {@link StatisticsCollector}.
 *
 * @author megha birmiwal
 */

public class TimeReporter implements Runnable {



        private final int timeToReport;

        private final int count;



        public TimeReporter(int timeToReport, int count) {

                this.timeToReport = timeToReport;

                this.count = count;

        }



        @Override

        public void run() {

                for (int i = 0; i < count; i++) {

                        StatisticsCollector.STATS.reportStat(timeToReport);

                }

        }

}



public class Main {



        public static void main(String args[]) throws InterruptedException {



                Thread threadX1 = new Thread(new TimeReporter(100, 10000));

                threadX1.start();

                Thread threadX2 = new Thread(new TimeReporter(100, 10000));

                threadX2.start();



                Thread threadY = new Thread(new TimeReporter(200, 10000));

                threadY.start();



                threadX1.join();

                threadX2.join();

                threadY.join();



                int timesCalled = StatisticsCollector.STATS.getTimesCalled();

                double average = StatisticsCollector.STATS.getAverage();



                System.out.println("Total Calls: " + (timesCalled));

                System.out.println("Average Time: " + (average));

        }

}