自定义异常类的父类可以是______。 A．Error B．VirtuaMachi

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问题单项选择题

自定义异常类的父类可以是______。

A．Error
B．VirtuaMachineError
C．Exception
D．Thread

答案

参考答案：C

解析：自定义异常类都是Throwable及其子集，所以只有C可以做它的父类。

阅读理解

阅读小天地，根据文内容判断下列句子的正(√)误(×)。

Lily and Lucy are classmates. They're in the same class. Lily is from the U. K. and Lucy is from the U. S.

Lucy usually walks to school. Her home is not far from school. She arrives at school at 8: 00 from Monday

to Friday. She likes to play the piano.

Lily usually goes to school by bus. But sometimes she rides her bike. She always has lunch at school,

because her home is far from school. She likes to play ping-pong. She usually plays ping-pong with her friends

after school.

( ) 1. Lucy and Lily are in different classes.

( ) 2. Lucy's home is far from school.

( ) 3. Lily usually goes to school by bike.

( ) 4. Lucy likes to play the piano.

( ) 5. Lucy and Lily are from the U. S.

单项选择题

下列选项中，属于IP协议的特点的是( )。

A．IP协议不知道数据报的路由

B．匿名服务

C．Qos保证

D．IP并不随意丢弃数据报，它尽最大努力投递数据报