java Callable 併發編程

package alibaba.data.demo.utils;

import com.sun.javafx.collections.MappingChange;

import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.*;

public class TheradPoll {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        //創建線程池
        ExecutorService executor = Executors.newCachedThreadPool();
        //提交任務並獲取執行結果
        List<Future<Object>> futureList = new LinkedList<>();
        futureList.add(executor.submit(new Callable<Object>() {
                                           @Override
                                           public Object call() throws Exception {
                                               //假數據
                                               Map<String,String> map = new HashMap<>();
                                               for(int i=0;i<10;i++){
                                                   map.put(i+"","0假數據"+i);
                                               }
                                               return map;
                                           }
                                       })
        );
        futureList.add(executor.submit(new Callable<Object>() {
                                           @Override
                                           public Object call() throws Exception {
                                               //假數據
                                               Map<String,String> map = new HashMap<>();
                                               for(int i=0;i<16;i++){
                                                   map.put(i+"","1假數據"+i);
                                               }
                                               return map;
                                           }
                                       })
        );

        //關閉線程池
        executor.shutdown();
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e1) {
            e1.printStackTrace();
        }
        System.out.println("主線程在執行任務");

        try {
            for (Future<Object> future : futureList){
                if(future.get()!=null){
                    System.out.println("task運行結果"+future.get().toString());
                }else{
                    System.out.println("未獲取到結果");
                }
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        } catch (ExecutionException e) {
            e.printStackTrace();
        }
        System.out.println("所有任務執行完畢");
    }
}

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