here is my enum:
public enum Etichetta { FT/IR, //problem with '/' character IB, COMM; } how can i get that special character? Keep in mind that I use this object that is sent to me in the body via post and then I have to save to db.
public class PrimaNota { private Integer id; private String impo; private String codC; private Etichetta etichetta; } In post method they send me FT/IR as a Etichetta. How can I do?
This problem is not caused by enums. You cannot use the special character "/" in any identifier, such as an enum, record, class, function or variable.
You can find the allowed characters in https://docs.oracle.com/javase/specs/jls/se16/html/jls-3.html. However even if something is legal, that does not necessarily mean that is a good idea, as there are certain naming conventions, such as UpperCamelCase for class names.
Identifier: IdentifierChars but not a Keyword or BooleanLiteral or NullLiteral IdentifierChars: JavaLetter {JavaLetterOrDigit} JavaLetter: any Unicode character that is a "Java letter" JavaLetterOrDigit: any Unicode character that is a "Java letter-or-digit" The "Java letters" include uppercase and lowercase ASCII Latin letters A-Z (\u0041-\u005a), and a-z (\u0061-\u007a), and, for historical reasons, the ASCII dollar sign ($, or \u0024) and underscore (_, or \u005f). The dollar sign should be used only in mechanically generated source code or, rarely, to access pre-existing names on legacy systems. The underscore may be used in identifiers formed of two or more characters, but it cannot be used as a one-character identifier due to being a keyword.
The "Java digits" include the ASCII digits 0-9 (\u0030-\u0039).
However what you can do is create a constructor that takes a string argument and pass that to a field and call that constructor when creating the enums. In this manner you can associate all kinds of strings with your enum constants.
public enum Etichetta { FT_IR("FT/IR"), IB("IB"), COMM("COMM"); private final String value; Etichetta(String value) { this.value = value; } @JsonValue public String getValue() { return value; } @JsonCreator public static Etichetta forValue(String value) { return Arrays.stream(Operation.values()) .filter(op -> op.getValue().equals(value)) .findFirst() .orElseThrow(); // depending on requirements: can be .orElse(null); } } or with Jackson 2.6.2
public enum MyEnum { @JsonProperty("FT/IR") FT_IR, @JsonProperty("IB") IB, @JsonProperty("COMM") COMM; } 
/(in general special characters and spaces between words) with_, for example.