package com.zetcode;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

import java.util.concurrent.Future;

public class FutureIsDoneEx {

public static void main(String[] args) throws InterruptedException, ExecutionException {

ExecutorService executorService = Executors.newSingleThreadExecutor();

Future<String> future = executorService.submit(() -> {

Thread.sleep(2000);

return "result from callable";

});

while (!future.isDone()) {

System.out.println("working on task...");

Thread.sleep(400);

}

System.out.println("task completed");

var result = future.get();

System.out.println(result);

executorService.shutdown();

}

}