Databases
StackOverflow2013
Postsdbo
POJava generics of generics of
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POJava generics of generics of
    primarykey
    data
    text
    <p>I have a generic class which represents a fragment of text. That fragment of text may have any of a number of different modes (different types of highlighting). Those modes are represented by an Enum. The Enum could be different for each project but it must implement an interface which provides a method to combine 2 of them (could be highlighted and bolded). So i have an interface:</p> <pre><code>public interface TextFragmentMode&lt;E extends Enum&lt;E&gt;&gt; { /** * Will combine the supplied mode with the current mode and return the * result. * * @param mode The mode to combine with. * @return The combined mode. */ public E combine( E mode ); } </code></pre> <p>Then my TextFragment is a container for both a String of text, and a mode. But when I try to declare the class:</p> <pre><code>public class TextFragment&lt;E extends TextFragmentMode&lt;E extends Enum&lt;E&gt;&gt;&gt; { StringBuilder text; E mode; ... </code></pre> <p>I get the following error:</p> <blockquote> <p>Syntax error on token "extends", , expected</p> </blockquote> <p>Which, according to eclipse syntax highlighting, is referring to the</p> <pre><code>E extends Enum&lt;E&gt; </code></pre> <p>portion of the code. Does anyone know what I am doing wrong? I must be missing something about Generics...</p> <p>--------------------- edit ------------------- </p> <p>I'm finally taking the time to read Effective Java by Josh Bloch (second edition), and it turns out he goes over this use case as <em>Item 34: Emulate extensible enums with interfaces</em>. As much as I would like to say great mind think alike... That would be WAY too presumtuous!</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USLucas
    1. USLucas
    plurals
    1. PL
      singulars
      1. LTLinked
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POJava generics of generics of
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POJava generics of generics of
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POJava generics of generics of
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload