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单选题
创建一个名为student的新类，保存新类的类库名称是mylib，新类的父类是Person，正确的命令是（ ）。
A
CREATE CLASS mylib OF student As Person
B
CREATE CLASS student OF Person As mylib
C
CREATE CLASS student OF mylib As Person
D
CREATE CLASS Person OF mylib As student
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参考解析
解析：
使用CREATE CLASS命令可以创建新的类库，基本格式为：CREATE CLASS新类名OF新类库名As父类。
使用CREATE CLASS命令可以创建新的类库，基本格式为：CREATE CLASS新类名OF新类库名As父类。
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import java.sql.*； package school； class Student{ }B
package school； import java.sql.*； class Student{ }C
package school； class Student{ } import java.sql.*；D
package school； import java.sql.*；private String name； class Student{ }
考题
单选题类Teacher和Student是类Person的子类； Person p； Teacher t； Student s； //p， t and s are all non-null. if（t instanceof Person） { s = （Student）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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