JAVA利用 executor 并发框架，实现 计算100的阶乘分解为 10 个子任务运算（idea）源码

我们知道100的阶乘的值为：

100的阶乘为：93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

这个值很大，一般数据类型无法接受，只有用JAVA程序语言中的 BigInteger 来接收

采用并发框架 executor 来计算

程序源代码

package text.ght02;//编写一个测试程序，利用 executor 并发框架，实现 100!分解为 10 个子任务运算。public class Main {public static void main(String[] args) throws InterruptedException {// 创建一个执行服务器Server server=new Server();// 创建10个任务，并发给执行器，等待完成for (int i=0; i<10; i++){Task task=new Task("Task "+i);Thread.sleep(10);server.submitTask(task);}server.endServer();}
}

package text.ght02;
import text.ght02.Task;import java.util.concurrent.Executors;
import java.util.concurrent.ThreadPoolExecutor;/*** 执行服务器**/
public class Server {//线程池private ThreadPoolExecutor executor;public Server(){executor=(ThreadPoolExecutor)Executors.newCachedThreadPool();//executor=(ThreadPoolExecutor)Executors.newFixedThreadPool(5);}//向线程池提交任务public void submitTask(Task task){System.out.printf("Server: A new task has arrived\n");executor.execute(task); //执行  无返回值System.out.printf("Server: Pool Size: %d\n",executor.getPoolSize());System.out.printf("Server: Active Count: %d\n",executor.getActiveCount());System.out.printf("Server: Completed Tasks: %d\n",executor.getCompletedTaskCount());}public void endServer() {executor.shutdown();}
}

package text.ght02;import javax.management.StringValueExp;
import java.math.BigInteger;
import java.util.Date;
import java.util.concurrent.TimeUnit;/*** Task 任务类*/
public class Task implements Runnable {private String name;public volatile BigInteger result = new BigInteger("1");//结果public volatile int time = 1;//用于计算100的阶乘，当做工具数public Task(String name) {this.name = name;}public void run() {while (true)// 循环是指线程不停的去执行业务操作{String str = Thread.currentThread().getName();BigInteger num = new BigInteger(String.valueOf(time));result = result.multiply(num);time++;System.out.println(str + "得到的值为：" + result);System.out.printf("%s: Task %s: Finished on: %s\n", Thread.currentThread().getName(), name, new Date());//            for (int i = k; i < k + 10; i++) {
//                BigInteger num = new BigInteger(String.valueOf(i));
//                result = result.multiply(num);
//                System.out.printf("%s: Task %s: Finished on: %s\n", Thread.currentThread().getName(), name, new Date());
//            }if (time > 100) {System.out.println("最终结果为：" + result);break;}}}
}