s=（Student）list[i];
是指 list 集合里存的 是 n 个 Student 对象,取出 第 i 个对象 Object,要将它强制转换为:Student类型.
s=（Student）list[i]; 这句应该是放在循环体里操作的吧.
ArrrayList list; class Student{……} Student s; s=（Student）lis
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