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  Stupid enum tricks  (Read 20051 times)
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Offline Wiki Duke

?





« Posted 2014-01-28 08:18:03 »

Note: you are watching revision 1 of this wiki entry. ( view plain diff )
Number of elements
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public enum Foo
{
  A,B,C;
   
  public static final int length = Foo.values().length;
}
This wiki entry has had 5 revisions with contributions from 3 members. (more info)
Offline DrakosKai

Senior Newbie


Medals: 3



« Reply #1 - Posted 2016-04-14 14:35:47 »

Inheritance and polymorphism also apply to Enums

However an Enum cannot extend a class but it can implement an interface.

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public interface AGLThing {
    public int id();
}


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public enum GLBuffers implements AGLThing {

    VERTEX(0),
    ELEMENT(2);
    private final int id;

    private GLBuffers(final int id) {
        this.id = id;
    }

    @Override
    public int id() {
        return id;
    }

    @Override
    public String toString() {
        return this.name() + ",id: " + this.id();
    }
}


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 public static void main(String[] args) {
        AGLThing vertexBufferInfo = GLBuffers.VERTEX;
        int vertexBufferId = vertexBufferInfo.id();
        System.out.println("Vertex Buffer id=" + vertexBufferId);
        System.out.println(vertexBufferInfo.toString());
    }


Output:

Vertex Buffer id=0
VERTEX,id: 0



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