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在面向对象技术中,(1)说明一个对象具有多种形态,(2)定义超类与子类之间的关系。
(1)A.继承
B.组合
C.封装
D.多态
(2) A.继承
B.组合
C.封装
D.多态
在11个元素的有序表A[1..11] 中进行折半查找( L(low+high)/2」 )查找元素A[11]时,被比较的元素的下标依次是( )。
A、6,8,10,11
B、6,9,10,11
C、6,7,9,11
D、6,8,9,11
下列 UML 类图表示的是(1)设计模式。该设计模式中,(2)
(1)A、备忘录(Memento)
B、策略(Strategy)
C、状态(State)
D、观察者(Observer)
(2)A、一个 Subject 对象对应多个 Observer 对象
B、Subject 只能有一个 ConcreteSubject 子类
C、Observer 只能有一个 ConcreteObserver 子类
D、一个 Subject 对象必须至少对应一个对象
In a world where it seems we already have too much to do, and too many things to think about, it seems the last thing we need is something new that we have to learn.
But use cases do solve a problem with requirements: with (1 ) declarative requirements it's hard to describle steps and sequences of events.
Use cases, stated simply, allow description of sequences of events that, taken together, lead to a system doing something useful. As simple as this sounds, this is important. When
指令系统中采用不同寻址方式的目的是()。
A.提高从内存获取数据的速度
B.提高从外存获取数据的速度
C.降低操作码的译码难度
D.扩大寻址空间并提高编程灵活性