package com.zhao.sian.hah;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.stream.Collectors;
import org.springframework.util.StopWatch;
public class CompletableFutureTest {
public static void main(String[] args) {
ExecutorService pool = Executors.newFixedThreadPool(10);
List<String> listStr=new ArrayList<String>();
listStr.add("123");
listStr.add("124");
listStr.add("125");
listStr.add("126");
StopWatch stopWatch = new StopWatch();
stopWatch.start();
List<String> list = listStr.stream().map((s) ->{
return s + 10 + "yongqian.zhao";
}).collect(Collectors.toList());
for (String str : list) {
System.out.println(str);
}
stopWatch.stop();
System.out.println(stopWatch.getTotalTimeMillis());
StopWatch stopWatch1 = new StopWatch();
stopWatch1.start();
List<CompletableFuture<String>> userInfoList=listStr.stream().map((s)->{
return CompletableFuture.supplyAsync(()->{
return s+10;
},pool).thenApply(str -> str + "yongqian.zhao");
}).collect(Collectors.toList());
userInfoList.forEach(value ->{
try {
System.out.println(value.get());
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
});
stopWatch1.stop();
System.out.println(stopWatch1.getTotalTimeMillis());
pool.shutdown();
}
}