题目内容
泛型只能应用于类、方法和接口中
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下面定义的泛型方法格式是否正确：修饰符返回值类型 <代表泛型的变量> 方法名(参数) { … }
JAVA的泛型中可以指定一个泛型的上限，而不能指定一个泛型的下限
如果在使用泛型时没有指明数据类型，那么就会擦除泛型类型，这会在运行期间抛出异常。
Are these sentences facts or opinions?___ 1. Perhaps the greatest change the world has seen in modern times has been the rise of the Internet.___ 2. It’s a great way to keep up with friends.___ 3. Internet access and the ability to make good use of it is practically a must for success in the modern world.___ 4. A few years ago, a couple in the United States was charged with child neglect. It was their addiction to playing games online that kept them from caring for their two infant children.___ 5. Another recent news story told of a man who spent so much time online that he didn’t sleep enough to keep his job.___ 6. One student not only failed, but lost 12 pounds.___ 7. It is easy for those who are unaffected by the powerful draw of connectivity – those who can easily control their time online – to view Internet addiction as an imaginary problem or to attribute its origins to a weak personality.____ 8. The Internet is a powerful tool, but make sure that you use it wisely for all the good value it offers and that you won’t let too much of a good thing become something bad.
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