Java-< T扩展Comparable< T>的含义&gt ;? [英] Java- The meaning of <T extends Comparable<T>>?

问题描述

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该方法的参数必须或者是实现Comparable或其派生类之一的类的对象？

感谢。

解决方案

这意味着类型参数必须支持通过Comparable接口与其自己类型的其他实例进行比较。

这样的例子Oracle教程对象排序中提供了一个类。注意类似于 T的模式在下面的摘录中扩展了Comparable< T> ：

  public class Name implements Comparable< Name> {
 ... 
 public int compareTo（Name n）{...} 
} 
  

The full context being:

public class RClass<T extends Comparable<T>>

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?

Thanks.

解决方案

This means that the type parameter must support comparison with other instances of its own type, via the Comparable interface.

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) { ... }
}

这篇关于Java-< T扩展Comparable< T>的含义&gt ;?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！