java多线程分发问题——多线程求和

最近读了<java编程思想>的分发部分，又碰到一个网友想利用多线程求和并且汇总求最后结果，具体要求是这样的“写十个线程,第一个线程求1到10的和,第二个11到20的和，第三个求21到30的和...第10个求91到100的和,求十个线程的和”。可以利用CyclicBarrier将分发后的任务汇总，将所有的线程去执行，执行结果后调用显示最后的结果线程。下面写了一段代码可以参考一下。
import java.util.concurrent.BrokenBarrierException;
import java.util.concurrent.CyclicBarrier;
/**

• 单独的计算线程，比如计算{1...10}的相加

• @author zhaohb
  */
  public class CounterThread extends Thread{
  private int start;
  private int end;
  private CyclicBarrier barrier ;
  public CounterThread(int id,int start, int end,CyclicBarrier barrier) {
  this.start = start;
  this.end = end;
  this.barrier = barrier;
  setName("Thread-"+id+" ");
  }

  @Override
  public void run() {
  int count = 0;
  for(int i=start;i<end+1;i++){
  count += i;
  }
  Counter.totalCount(count);
  try {
  barrier.await();
  } catch (InterruptedException e) {
  e.printStackTrace();
  } catch (BrokenBarrierException e) {
  e.printStackTrace();
  }
  }
  }

import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**

• 测试类入口

• @author zhaohb
  */
  public class CounterTest {

  public static void main(String[] args) {
  //CyclicBarrier指定了当10个线程运行结束时候，可以进行最后结果展示了
  CyclicBarrier barrier = new CyclicBarrier(10,new TotalTask(new Counter()));
  ExecutorService executorService = Executors.newCachedThreadPool();
  for(int i=0;i<10;i++){
  int start = i*10+1;
  int end = start + 9;
  CounterThread counterThread = new CounterThread(i,start, end,barrier);
  executorService.execute(counterThread);
  }
  executorService.shutdown();
  }
  }

/**

• 线程结果计算：将单独的线程的计算的结果相加，汇总的到总的结果

• @author zhaohb
  *
  */
  class Counter {

  private static int count =0;
  public synchronized static int totalCount(int perCount){
  count += perCount;
  return count;
  }

  public int totalResult(){
  return count;
  }

}
/**

• 最后结算展示线程

• @author zhb
  *
  */
  class TotalTask implements Runnable{
  private Counter counter ;
  public TotalTask(Counter counter){
  this.counter = counter;
  }

  @Override
  public void run() {
  System.out.println("所有线程运行完毕，总结果为：");
  
  int total = counter.totalResult();
  System.out.println(total);
  }
  }