单选题如果ALPHA类继承自BETA类，则ALPHA类称为（），BETA 类称为（）。A基类；派生类B密封类；基类C派生类；基类
单选题
如果ALPHA类继承自BETA类，则ALPHA类称为（），BETA 类称为（）。
A
基类；派生类
B
密封类；基类
C
派生类；基类
参考解析
解析：
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14 Alpha buys goods from Beta. At 30 June 2005 Beta’s account in Alpha’s records showed $5,700 owing to Beta.Beta submitted a statement to Alpha as at the same date showing a balance due of $5,200.Which of the following could account fully for the difference?A Alpha has sent a cheque to Beta for $500 which has not yet been received by Beta.B The credit side of Beta’s account in Alpha’s records has been undercast by $500.C An invoice for $250 from Beta has been treated in Alpha’s records as if it had been a credit note.D Beta has issued a credit note for $500 to Alpha which Alpha has not yet received.
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单选题Given： Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）A Alpha a = x；B Foo f = （Delta）x；C Foo f = （Alpha）x；D Beta b = （Beta）（Alpha）x；
填空题如果类A继承了类B，则类A被称为（）类，类B被称为（）类。