我这个运行提示类型转换异常 求解

   Course[] course= {
     new Course("3","大学语文"),
     new Course("4","大学英语")
   };
   coursesToSelect.add(Arrays.asList(course));
  //下面两行提示类型转换异常

Course temp3=(Course) coursesToSelect.get(2);
   Course temp4=(Course)coursesToSelect.get(3);