为什么要给了具体课程，放进集合，然后又调出来？
Course[] course = { new Course("3", "离散数学"), new Course("4", "汇编语言") };
coursesToSelect.addAll(Arrays.asList(course));
Course temp3 = (Course) coursesToSelect.get(2);
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Course[] course = { new Course("3", "离散数学"), new Course("4", "汇编语言") };
coursesToSelect.addAll(Arrays.asList(course));
Course temp3 = (Course) coursesToSelect.get(2);
2016-08-20
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