Enum to String Conversion

Question

I have a class TestCase. Inside of this I have the inner class Test. Inside the class enum OwnerType with setters and getters of the enum.

public static final class Test {
    public enum OwnerType {
        User("User"), Role("Role");
        private final String value;
        private OwnerType(String value) {
            this.value = value;
        }
        public String toValue() {
            return value;
        }
    }

    private OwnerType m_ownerType;
    public OwnerType getOwnerType() {
        return m_ownerType;
    }

    public void setOwnerType(OwnerType m_ownerType) {
        this.m_ownerType = m_ownerType;
    }

    private JSONObject getJSONObject() {
        JSONObject obj = new JSONObject();
        obj.put(KEY, new JSONString(m_ownerType.toString())); // Showing Error Enum to String Conversion

        return obj;
    }
}

m_ownerType is OwnerType Enum so in obj.put() I am doing wrong related with some conversion from enum to string.

Thanks.

Answer 1

Java枚举带有内置函数name() ，这是将它们序列化为字符串的首选方法。

Answer 2

Take a look at Three ways to Serialize Java Enums . It depends on your use case but using the name() method looks fine in most use cases.

Answer 3

All you really need in an enum is this:

public enum OwnerType {
    User,
    Role
}

And to get its value as String you can call .name() or .toString() :

OwnerType ot = OwnerType.User;
System.out.println("Owner is of type: " + ot.name());

That will print out "Owner is of type: User" . The next two will produce the same result:

System.out.println("Owner is of type: " + ot.toString());
System.out.println("Owner is of type: " + ot); // Implicit call to toString()