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Tuesday, March 6. 2012
Java Enum Override
I get a lot of use out of Java 5 enums:
But here's a nice trick; as enum members are actually classes, you can override the member functions they contain. I find this most useful overriding toString:
enum Galaxies { MilkyWay, Andromeda, NGC4414 }But here's a nice trick; as enum members are actually classes, you can override the member functions they contain. I find this most useful overriding toString:
enum Galaxies {
MilkyWay {
@Override
public String toString() {
return "Milky Way";
},
Andromeda,
NGC4414 {
@Override
public String toString() {
return "NGC 4414";
}
}
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Just curious how you might implement something that requires localization in this case? As I assume the reason to do this is to be able to display that text someplace. Or is there another reason to have the string that way that I'm missing?
Internationalization in Java is usually done using Resource Bundles, so it would be a matter of getting the resource bundle for the locale using ResourceBundle b = ResourceBundle.getBundle("Galaxies") which would retrieve "Galaxies_en_US" if that is your current locale, then you would change the return function for MilkyWay to return b.getString("Milky Way").