多线程的三种创建方法之实现Callable接口

• 实现Callable接口，需要返回值类型
• 重写call方法，需要抛出异常
• 创建目标对象
• 创建执行服务：ExecutorService ser = Executors.newFixedThreadPool(1);
• 提交执行：Future result1 = ser.submit(t1);
• 获取结果：boolean r1 = result1.get()
• 关闭服务：ser.shutdownNow();

package Thread;

import java.util.concurrent.*;

public class Demo05 implements Callable {
    @Override
    public String call() throws Exception {

        Thread.sleep(3000);
        return "result string";
    }

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Demo05 demo05 = new Demo05();

        //创建线程池
        ExecutorService service = Executors.newFixedThreadPool(1);

        //提交任务
        Future result = service.submit(demo05);

        //get方法阻塞主线程，要获取到结果才会继续执行
        System.out.println(result.get());

        System.out.println("主线程获得了结果");

        //关闭服务
        service.shutdownNow();

    }
}


//运行结果
result string
主线程获得了结果