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JAVA REFLECTION GET FIELD VALUE FROM OBJECT HOW TO
it should be lower level object, but I have no idea how to get it. It shows that you dont have to care about the exact concrete class of the object, what matters is that you know the class the field is on and that that class is either the concrete class or a superclass of the object. Here is a Java code, which I have found on the net, to set field value using reflection: public. This example (its in Groovy but the method calls are identical) gets a Field object for the class Foo and gets its value for the object b. If you know what class the field is on you can access it using reflection. Running this has an output Java reflection: how to get field value from an object, not knowing its class O, and your entity should be an object of your class, not your class itself. This example (it's in Groovy but the method calls are identical) gets a Field object for the class Foo and gets its value for the object b. java reflection to create field/value hashmap. However, you can use Springs ReflectionUtils to make fields accessible, even if they are private like the below runnable example: List list = new ArrayList() įield field = .findField(clazz, value) If you know what class the field is on you can access it using reflection. It can change the value of a private field of an object. obj - object from which the represented fields value is to be extracted. It can get a list of fields in a class and investigate their properties. In case of primitive type, The value is automatically wrapped in an object. If you have Cars and Trucks you can use a common superclass/interface like this List. Java Field get() Method with Examples on java, field, equal(), getAnnotatedType(), getAnnotation(), get(), java tutorial, history of java, features. I strongly recommend using Java generics to specify what type of object is in that List, ie. Or if youre consuming a Java 1.4 interface where generics arent available, but you know the type of the objects that should be in the list… List list If you can change your method to return a List, this becomes very easy because the iterator then can give you type information: List list //From your method get (obj) // Assign one by one nameVlues + field.getName() + ': '. Get attribute value Object value field.
JAVA REFLECTION GET FIELD VALUE FROM OBJECT CODE
Java reflection: how to get field value from an object, not knowing its classĪssuming a simple case, where your field is public: List list // from your methodįield field = clazz.getField(fieldName) //Note, this can throw an exception if the field doesnt exist.īut this is pretty ugly, and I left out all of the try-catches, and makes a number of assumptions (public field, reflection available, nice security manager). Description get Field Value With Getter Demo Code import . Java reflection to get attributes and attribute values, Programmer All, we have been working hard to make a technical sharing website that all programmers love.