Java泛型问题：类“不在类型变量的范围内”错误。

问题描述

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解决方案基础类型的$ c> 课程。因此 K 必须扩展可比较<可锁定<课程>> &安培;可设置关键点<课程和GT; 。但它没有，它扩展了 Comparable< Keyable< DataElement>> &安培; Keyable< DataElement> 。
 
 
 
我想  DataElement  应该类似于  Comparable  或  Enum  。  
 
 
  public interface Keyable< T> {public String getKey（）;} 
 
 public interface DataElement< THIS extends DataElement< THIS>>可扩展<可关联< THIS>>，可键< THIS>，可序列化{...} 
公共类课程实现DataElement< Course> {...} 
 
 
 public interface SearchTree< K extends Comparable< Keyable< K>> &安培;可设置关键点< K>>扩展Serializable {...} 
 public class MySearchTree实现SearchTree< Course> {
  
 
I'm working on a project for class that involves generics.
public interface Keyable <T> {public String getKey();}

public interface DataElement extends Comparable<Keyable<DataElement>>, Keyable<DataElement>, Serializable {...}
public class Course implements DataElement {...}


public interface SearchTree<K extends Comparable<Keyable<K>> & Keyable<K>> extends Serializable {...}
public class MySearchTree implements SearchTree<Course> {
...
    private class Node {
        public Course data;
        public Node left;
        public Node right;
        ...
    }
}
When trying to use the Course class within the declaration of MySearchTree, I receive a type argument error stating that "Course is not within the bounds of type-variable K". I spent a good amount of time trying to figure out what attributes Course might be lacking to make it not fit the bill, but came up empty.
Any ideas?
 解决方案 
In MySearchTree the K of the base type is Course. So K must "extend" Comparable<Keyable<Course>> & Keyable<Course>. But it doesn't, it extends Comparable<Keyable<DataElement>> & Keyable<DataElement>.
I guess DataElement should be generified in a similar manner to Comparable or Enum.     
public interface Keyable <T> {public String getKey();}

public interface DataElement<THIS extends DataElement<THIS>> extends Comparable<Keyable<THIS>>, Keyable<THIS>, Serializable {...}
public class Course implements DataElement<Course> {...}


public interface SearchTree<K extends Comparable<Keyable<K>> & Keyable<K>> extends Serializable {...}
public class MySearchTree implements SearchTree<Course> {
                        
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