Java-<T extends Comparable<T>>的含义?
完整的上下文是:
public class RClass<T extends Comparable<T>>
我是否正确地说，标题中的陈述意味着插入方法的参数必须是实现 Comparable 的类的对象或其派生类之一?
Would I be right in saying that the statement in the title means that the arguments plugged into the method must either be an object of a class which implements Comparable OR one of its derived classes?
谢谢.
推荐答案
这意味着类型参数必须支持通过 Comparable 接口与自己类型的其他实例进行比较.
This means that the type parameter must support comparison with other instances of its own type, via the Comparable interface.
Oracle 教程Object Ordering 中提供了此类类的示例.请注意以下摘录中与 T extends Comparable<T> 类似的模式:
An example of such a class is provided in the Oracle tutorial Object Ordering. Note the similar pattern to T extends Comparable<T> in the excerpt below:
public class Name implements Comparable<Name> {
...
public int compareTo(Name n) { ... }
}