如何将空字符串设置为 Java 枚举值？

Question

I am facing a problem when handling with empty java string as java enum value. Its throwing IllegalArgumentException when reading the "" data.

updateType = records.get(11);
UpdateMethodType updateMethod = null;
String empty = "";
if (updateType != null || !updateType.isEmpty()) {
    System.out.println("Update type ----->" + updateType);
    updateMethod = KalturaUpdateMethodType.valueOf(updateType);
} else {
    updateMethod = KalturaUpdateMethodType.valueOf(empty);
}

Please help me resolving this.

Answer 1

There can't be any empty enum value. you can instead have a special enum value named EMPTY in KalturaUpdateMethodType .

Answer 2

This is an expected behavior. You should not pass empty string to valueOf() method. and if you pass null you will get a NPE. So better you create a new enum for EMPTY string. Like :

enum KalturaUpdateMethodType {
    EMPTY("");
    String value;
    private KalturaUpdateMethodType(String value) {
      this.value = value;
   }
}