62 lines
2.2 KiB
Java
62 lines
2.2 KiB
Java
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import java.util.ArrayList;
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import java.util.List;
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import java.util.concurrent.*;
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/**
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* @author yjy
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* @version 1.0
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* @date 2021/7/30 11:09 上午
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*/
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public class ThreadList {
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public static void main(String[] args) throws InterruptedException, ExecutionException {
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List<String> list = new ArrayList<>(); //造list数据
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for (int i = 0; i < 5300; i++) {
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list.add("" + i);
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}
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// 计算线程数
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int threadSize = 500;//每500条数据开启一个线程
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int remainder = list.size() % threadSize; //取余
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int threadNum = 0; //线程数
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if (remainder == 0) { //能整除500
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threadNum = list.size() / threadSize;
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} else { //不能整除线程数要加1
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threadNum = list.size() / threadSize + 1;
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}
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ExecutorService eService = Executors.newFixedThreadPool(threadNum); //创建一个线程池
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List<Callable<String>> cList = new ArrayList<>(); //定义添加线程的集合
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Callable<String> task = null; //创建单个线程
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List<String> sList = null;
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for (int i = 0; i < threadNum; i++) { //每个线程中加入分段数据
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if (i == threadNum - 1) {
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sList = list.subList(i * threadSize, list.size());
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} else {
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sList = list.subList(i * threadSize, (i + 1) * threadSize);
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}
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final List<String> nowList = sList;
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//创建单个线程
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task = new Callable<String>() {
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@Override
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public String call() throws Exception {
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StringBuffer sb = new StringBuffer();
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for (int j = 0; j < nowList.size(); j++) {
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sb.append("" + nowList.get(j));
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}
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return sb.toString();
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}
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};
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cList.add(task); //添加线程
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}
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List<Future<String>> results = eService.invokeAll(cList); //执行所有创建的线程，并获取返回值（会把所有线程的返回值都返回）
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for (Future<String> str : results) { //打印返回值
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System.out.println(str.get());
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}
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eService.shutdown();
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}
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}
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