多线程运行怎么分配线程数和每个线程读取的start和end

背景：最近项目中用到了多线程并发，需要将一批任务用多个线程来并发执行，

首先根据runNumPerThread,计算线程数，然后跟最大线程数取较小的值作为最终的线程数

然后根据最终的线程数计算出每个线程要运行的start和end

前n-1个线程都是运行runNumPerThread个请求，

最后一个线程运行total-(n-1)*runNumPerThread个请求，

 

        int total=10000;   //总的任务数
        int maxThreadCount=5; //最大线程数
        int runNumPerThread=200;   //每个线程运行的任务数量的初始值
        int threadCount = 0;  //最终的线程数
        if (total % runNumPerThread == 0) {
            threadCount =total / runNumPerThread > 0 ? total / runNumPerThread : 0;
        } else {
            threadCount = total / runNumPerThread > 0 ? total / runNumPerThread + 1 : 1;
        }
        threadCount=threadCount>maxThreadCount?maxThreadCount:threadCount;

        runNumPerThread=total/threadCount;
        for (int i = 0; i < threadCount; i++) {
            int start = i * runNumPerThread;
            int end = 0;
            if (i == threadCount - 1 && total % runNumPerThread != 0) {
                end = start + total-i*runNumPerThread - 1;
            } else {
                end = start + runNumPerThread - 1;
            }
            System.out.println("start="+start+",end="+end);
        }