[ACCEPTED]-Java Reflection, Ignore case when using GetDeclaredField-reflection

Accepted answer
Score: 17

Just use Class.getDeclaredFields() and look through the results performing 1 a case-insensitive match yourself.

Score: 4

No, there's no such way. You can get all 1 fields and search through them:

Field[] fields = src.getClass().getDeclaredFields();
for(Field f:fields){
Score: 2

The only way I see is to iterate over all 2 declared fields and compare the names case-insensitively 1 to the field name you are looking for.

Score: 2

Get a list of all declared fields and manually 2 go through them in a loop doing a case insensitive 1 comparison on the name.

Score: 2

No, there is no direct way of doing this, however 2 you could create a helper method for doing 1 this. e.g. (untested)

public Field getDeclaredFieldIngoreCase( Class<?> clazz, String fieldName ) throws NoSuchFieldException {

        for( Field field : clazz.getDeclaredFields() ) {
            if ( field.getName().equalsIgnoreCase( fieldName ) ) {
                return field;
        throw new NoSuchFieldException( fieldName );
Score: 1

I don't mean to necro this thread but if 8 you used any of the methods above inside 7 a loop your performance will be awful. Create 6 map beforehand

first take the item your search 5 for to uppercase


now create a map that has 4 the uppercase version and the true fieldnames

Map<String, String> fieldNames = Arrays.asList(clazz.getDeclaredFields()).stream().collect(Collectors.toMap(t -> t.getName().toUpperCase(), f->f.getName()));

now 3 use that to grab the true fieldname

  Field field = clazz.getDeclaredField(fieldNames.get(key));

I would 2 say always create such a map, always consider 1 performance when it comes to reflection.

Score: 0

Best to try to get field with fieldName 2 if does not exist then loop through list 1 of fields

public static Field findFieldIgnoreCase(Class<?> clazz, String fieldName) throws SecurityException, NoSuchFieldException {
    try {
        return clazz.getDeclaredField(fieldName);
    } catch (NoSuchFieldException e) {
        Field[] fields = clazz.getDeclaredFields();
        for (Field field : fields) {
            if (field.getName().equalsIgnoreCase(fieldName)) {
                return field;
        throw new NoSuchFieldException(fieldName);

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