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POEmulating extensible enums using interfaces
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2013-11-22T17:49:00.100
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So here I was trying this "Effective Java 2nd edition" exercise about writing extensible enums. I faced a really strange issue though - I had each of the enum instances implement the interface methods and all looked good in eclipse. But when I tried to compile it through maven, it failed, although eclipse didn't throw any compilation errors previously at all (both my eclipse and maven use the same JDK: <code>1.6.0_33-b05</code>). It turned out that I had to override the interface method(s) [I'll call it method X from now] inside the enum (outside of all enum instances) too for fixing this! Here's a sample explaining this: Interface: <pre><code>public interface IDay { public boolean isHoliday(); } </code></pre> Enum: <pre><code>public enum Day implements IDay { SATURDAY { @Override public boolean isHoliday() { return true; } }, SUNDAY { @Override public boolean isHoliday() { return true; } }, MONDAY { @Override public boolean isHoliday() { return false; } }; // Method X: the project won't compile for me without this method! public boolean isHoliday() { return false; } } </code></pre> Invocation: <pre><code>public class DayTester { public static void main(final String[] args) { // line Y: this line won't maven compile if I got rid of the method X System.out.println("Sunday: " + Day.SUNDAY.isHoliday()); } } </code></pre> Strange enough, eclipse was completely ok without the method 'X' yet the maven compilation would fail on the line Y saying <blockquote> [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project X: Compilation failure [ERROR] DayTester.java:[7,46] cannot find symbol [ERROR] symbol : method isHoliday() [ERROR] location: class Day </blockquote> And my eclipse save actions automatically inserts @Override if I had the method X in place. Removing the method X throws compilation errors in my eclipse aon those Override annotations I had previously. Here are my questions: 1. Why won't maven compile in this case when eclipse does? 2. What do the Override annotation errors mean here? 3. Is the method X even accessible somehow? What am I missing to understand? 
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<java><maven><enums>
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Emulating extensible enums using interfaces
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