Java – can I get an enumeration based on the value of its field?
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Java
I want to get a specific enumeration based on its field value
Enumeration:
public enum CrimeCategory { ASBO ("Anti Social BehavIoUr"),BURG ("Burglary"),CRIMDAM ("Criminal Damage And Arson"),DRUGS ("Drugs"),OTHTHEFT ("Other Theft"),PUPDISOR ("Public Disorder And Weapons"),ROBBERY ("Robbery"),SHOPLIF ("Shoplifting"),VEHICLE ("Vehicle Crime"),VIOLENT ("Violent Crime"),OTHER ("Other Crime"); private String category; private CrimeCategory (String category) { this.category = category; } public String returnString() { return category; } }
Get new enumeration:
aStringRecivedFromJson = "Anti Social BehavIoUr" CrimeCategory crimeCategoryEnum; crimeCategoryEnum = CrimeCategory.valueOf(aStringRecivedFromJson);
I've been trying to find a way to provide an enumeration above so that it can be distributed in the HashMap along with other crime information Expected accomplishment: ASBO
Solution
For reference, here is an alternative solution to HashMap:
enum CrimeCategory { ASBO("Anti Social BehavIoUr"),BURG("Burglary"),CRIMDAM("Criminal Damage And Arson"),DRUGS("Drugs"),OTHTHEFT("Other Theft"),PUPDISOR("Public Disorder And Weapons"),ROBBERY("Robbery"),SHOPLIF("Shoplifting"),VEHICLE("Vehicle Crime"),VIOLENT("Violent Crime"),OTHER("Other Crime"); private static final Map<String,CrimeCategory> map = new HashMap<>(values().length,1); static { for (CrimeCategory c : values()) map.put(c.category,c); } private final String category; private CrimeCategory(String category) { this.category = category; } public static CrimeCategory of(String name) { CrimeCategory result = map.get(name); if (result == null) { throw new IllegalArgumentException("Invalid category name: " + name); } return result; } }
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