java 多线程（Callable，Future）

package step2;
import java.util.concurrent.Callable;
import java.util.concurrent.FutureTask;
public class Task {
    public void runThread(int num) {
        // 在这里开启线程 获取线程执行的结果
        //请在此添加实现代码
/********** Begin **********/
Callable<Integer> callable = new ThreadCallable(num);
        FutureTask<Integer> futureTask = new FutureTask<>(callable);
        new Thread(futureTask).start();//开启线程
        try {
            Integer result = futureTask.get();
            System.out.println("线程的返回值为：" + result);
        } catch (Exception e) {
            e.printStackTrace();
        }
/********** End **********/
    }
}
/********** Begin **********/
/* 在这里实现Callable接口及方法 */
class ThreadCallable implements Callable<Integer> {
    private int num;
    public ThreadCallable() {
    }
    public ThreadCallable(int num) {
        this.num = num;
    }
    public Integer call() throws Exception {
        int[] arr = new int[2];
        arr[0] = 1;
        arr[1] = 1;
        for (int i = 2; i < num; i++) {
            int tmp = arr[1];
            arr[1] = arr[0] + arr[1];
            arr[0] = tmp;
        }
        return arr[1];
    }
}
/********** End **********/