Java – when the enumeration type reference is class How do I convert a string to an enumerated value?

I have code to set values on objects using the setter method One of the setters takes enum type as a method parameter The code looks like this:

String value = "EnumValue1";
    Method setter = getBeanWriteMethod("setMyEnumValue");
    Class<?> type = setter.getParameterTypes()[0];
    Object convertedValue = null;
    if (type.isEnum()) {
       convertedValue = convertToEnum(value,type);
    } else {
       convertedValue = ClassUtils.convertType(value,type);
    }
    return convertedValue;

The question is what to put in the converttoenum method I know I can "force it" by iterating over the enumeration constant (or field) of a type object to match the value Did I ignore the simpler method of using reflection? (I looked at several examples, but I didn't find any enumeration that can only be known through class)

Solution

Off my head:

Enum<?> convertedValue = Enum.valueOf((Class<Enum>)type,value);

This converts the string to an enum constant of the enum class of type

Editor: now I have a computer for convenience. I can see what it actually does Without compiler warnings, any of the following conditions work correctly:

Enum<?> convertedValueA = Enum.valueOf(type,value);
Enum<?> convertedValueB = Enum.valueOf(type.asSubclass(Enum.class),value);

The second call, assubclass (), performs a runtime check to ensure that the type is some enumeration class, but the valueof () method must be checked to work properly

The following gives me a compilation error:

Enum<?> convertedValueC = Enum.valueOf((Class<? extends Enum <?>>)type,value);

java: Foo.java:22: <T>valueOf(java.lang.Class<T>,java.lang.String) in java.lang.Enum cannot be applied to (java.lang.Class<capture#134 of ? extends java.lang.Enum<?>>,java.lang.String)

The complexity of projecting wildcard types puzzles me, so I may have tried the wrong actors In addition, the fact that it has no runtime effect means that it is easy to make mistakes and will never be found