多线程：返回三个数中的最大数

@Test
public void test1() throws ExecutionException, InterruptedException {
    //创建线城实例
    MaxNum m = new MaxNum(3, 5, 7);
    //创建FutrueTask实例
    FutureTask<Integer> ft = new FutureTask<Integer>(m);
    Thread thread = new Thread(ft);
    thread.start();
    System.out.println("最大的数为：" + ft.get());
}
class MaxNum implements Callable<Integer> {
    int i, j, k;
    public MaxNum(int i, int j, int k) {
        this.i = i;
        this.j = j;
        this.k = k;
    }
    @Override
    public Integer call() throws Exception {
        return Math.max(Math.max(i, j), k);
    }
}