java – 我可以根据其字段的值获取枚举吗？

发布时间：2020-12-14 16:35:51 所属栏目：Java 来源：网络整理

导读：我想根据其字段值获取一个特定的枚举. 枚举： public enum CrimeCategory { ASBO ("Anti Social Behaviour"),BURG ("Burglary"),CRIMDAM ("Criminal Damage And Arson"),DRUGS ("Drugs"),OTHTHEFT ("Other Theft"),PUPDISOR ("Public Disorder And Weapons")

我想根据其字段值获取一个特定的枚举.

枚举：

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; 
    }
}

获得新的枚举：

aStringRecivedFromJson = "Anti Social Behaviour"
CrimeCategory crimeCategoryEnum;
crimeCategoryEnum = CrimeCategory.valueOf(aStringRecivedFromJson);

我一直在试图找出一个方法,以便上面提供一个枚举,以便它可以通过与其他犯罪信息一起散布在Hashmap中.
预期成果：ASBO

解决方法

作为参考,这里有一个替代解决方案与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;
  }
}

（编辑：李大同）

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