Callable 与 Future

 

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;

public class CallableTest {

	// Asynchronous barrel principle
	 public static void main(String[] args) throws InterruptedException, ExecutionException {
		 ExecutorService executorService = Executors.newCachedThreadPool();
	    int num = 5;
	    System.out.println(System.currentTimeMillis());
		 List<Future<String>> resultList = new ArrayList<Future<String>>();
	    for (int i = 0; i < num; i++) {
	    	Future<String> futureTask = executorService.submit(new TaskCallable(i));
	    	resultList.add(futureTask);
		}
	    System.out.println(System.currentTimeMillis());
	    for (Future<String>  future: resultList) {
			System.out.println(future.get());
		}
	    System.out.println(System.currentTimeMillis());
	 }
	 
	 public static class  TaskCallable  implements Callable<String>{

		 private int taskId;
		 
		public TaskCallable(int taskId) {
			this.taskId = taskId;
		}


		@Override
		public String call() throws Exception {
			 Thread.sleep(taskId*1000);
			return "taskId="+taskId+",time="+System.currentTimeMillis();
		}
		 
	 }
}

 

 

 

 

 

 

 

 

 

 

 

 

 

Donate to developers 

Driven by interest, I write 免费something with joy and sweat. I hope you like my work and can support it at the same time. Of course, if you have money to support a money field (support Alipay, WeChat, and the buckle group), if you have no money to support a personal field, thank you.

 

Personal homepage : http://knight-black-bob.iteye.com/

 
 
 Thank you for your sponsorship, I will do better!