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类Teacher和Student是类Person的子类;Person p;Teacher t;Student s; //p, t and s are all non-null.if(){ s =()t; }最后一句语句的结果是()
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类Teacher和Student是类Person的子类;Person p;Teacher t;Student s; //p, t and s are all non-null.if(){ s =()t; }最后一句语句的结果是()
A. 将构造一个Student对象;
B. 表达式是合法的;
C. 表达式是错误的;
D. 编译时正确,但运行时错误。
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