Why not check instance of java.lang.reflect.Field with java.util.List

Question

I want check that field type is List or not, but that is giving an error:

Incompatible conditional operand types Class<capture#5-of ?> and 
     List
- Incompatible conditional operand types Class<capture#6-of ?> and 
     List

How can I solve this?

private void convert(Class<?> load) {

        Field[] fields = load.getDeclaredFields();
        int i = 0;
        for (Field field : fields) {
            Class<?> type = field.getType();
            if (type instanceof java.util.List) {
            }
        }
    }

Nikolay Kasapov · Accepted Answer · 2015-05-11 05:23:25Z

6

private void convert(Class<?> load) {

    Field[] fields = load.getDeclaredFields();
    int i = 0;
    for (Field field : fields) {
        Class<?> type = field.getType();
        if (java.util.List.class.isAssignableFrom(type)) {
        }
    }
}

instanceof operator is used only for instances!

answered May 11, 2015 at 5:23

Nikolay Kasapov

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2 Comments

Gaali Prabhakar Over a year ago

actually type is child of List class. i want exact java.util.List class instances here list children can be assign

Gaali Prabhakar Over a year ago

public class B implements List{ } the above loaded Field type is B so it is giving true because it can be assignable . i want only List type i dont want B type.

Holger · Accepted Answer · 2015-05-13 16:50:48Z

1

If you want the declared type of the field to match java.util.List exactly, you can use the expression field.getType()==java.util.List.class to test it.

Still, the value of that field is either null or an instance of a concrete class which implements the list interface.

answered May 13, 2015 at 16:50

Holger

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