public class ThreadList {
public static void main(String[] args) throws InterruptedException, ExecutionException {
List<String> list = new ArrayList<>();
for(int i=0;i<5300;i++){
list.add(""+i);
}
int threadSize = 500;//每500条数据开启一个线程
int remainder = list.size()%threadSize;
int threadNum = 0;//线程数
if(remainder == 0){
threadNum = list.size()/threadSize;
} else {
threadNum = list.size()/threadSize + 1;
}
ExecutorService eService = Executors.newFixedThreadPool(threadNum );//创建一个线程池
List<Callable<String>> cList = new ArrayList<>();
Callable<String> task = null;
List<String> sList = null;
for(int i=0;i<threadNum;i++){
if(i == threadNum - 1){
sList = list.subList(i*threadSize, list.size());
} else {
sList = list.subList(i*threadSize, (i+1)*threadSize);
}
final List<String> nowList = sList;
task = new Callable<String>() {
@Override
public String call() throws Exception {
StringBuffer sb = new StringBuffer();
for(int j=0;j<nowList.size();j++){
sb.append(""+nowList.get(j));
}
return sb.toString();
}
};
cList.add(task);
}
List<Future<String>> results = eService.invokeAll(cList);
for(Future<String> str:results){
System.out.println(str.get());
}
eService.shutdown();
}
}
java多线程批量处理list集合中的数据
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转载自blog.csdn.net/java_chegnxuyuan/article/details/90081277
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