Class CountingTask

concurrent/CountingTask.java:7–18

import java.util.concurrent.*;

public class CountingTask implements Callable<Integer> {
  final int id;
  public CountingTask(int id) { this.id = id; }
  @Override public Integer call() {
    Integer val = 0;
    for(int i = 0; i < 100; i++)
      val++;
    System.out.println(id + " " +
      Thread.currentThread().getName() + " " + val);
    return val;
  }
}