创建线程的方法

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class testCallable {
    public static void main(String[] args) {
        Test test = new Test();
        //调用Callable需要构造一个FutureTast装载实现Callable的类
        FutureTask<Integer> futureTask = new FutureTask<>(test);
        //FutureTask继承了Runnable接口
        Thread t = new Thread(futureTask);
        t.start();

        try {
            //可通过get()方法获取线程返回的值
            //try/catch捕获异常
            System.out.println(futureTask.get());;
        } catch (InterruptedException | ExecutionException e) {
            e.printStackTrace();
        }
    }
}
//实现Callable接口
class Test implements Callable<Integer>{

    //重写call方法，相比run方法更加强大，
    //能返回值和抛出异常
    @Override
    public Integer call() throws Exception {
        int sum=0;
        for (int i = 1; i <=100; i++) {
            System.out.println(i);
            sum+=i;
        }
        return sum;
    }

}