#Java reflection example program how to

Here notice that the type for the field val is displayed as because generics are implemented via Output Field name - name has Field Type class įield name - name has Generic Field Type class įield name - i has Generic Field Type intįield name - numList has Field Type interface įield name - numList has Generic Field Type įield name - val has Field Type class įield name - val has Generic Field Type T + ' has Generic Field Type ' + field.getGenericType()) If you want to know the types of fields in any class using Java reflection API you can do it using the methods getType()Īnd getGenericType(). You can see here getFields() return array of all public fields in the class where as getDeclaredFields() returnĪll the fields (field i is having access modifier as private). Public .val]ĭeclared Fields - [public .name, private int .i, ('Declared Fields - ' + Arrays.toString(fields)) Īll Fields - [public .name, public .numList, ('All Fields - ' + Arrays.toString(fields)) In this example generic class ReflectField is used which has few fields with access modifier as public or private. Getting field information using Java reflection example So getFields() methods will only return object for public fields where as getDeclaredField() methods will getDeclaredFields()- Returns an array of Field objects reflecting all the fields declared by the class or interface represented by this Class object.Interface represented by this Class object.

getDeclaredField(String name)- Returns a Field object that reflects the specified declared field of the class or.

getFields()- Returns an array containing Field objects reflecting all the accessible public fields of the class or interface.

getField(String name)- Returns a Field object that reflects the specified public member field of the class or interface.

There are 4 methods for getting fields of the class. Interface that reflects identifying informationĪbout a single member (a field or a method) or a constructor. With in the Reflection hierarchy an interface is defined which is implemented by Getting and Setting Field Values using reflection.Getting field modifiers using reflection.

Getting field information using Java reflection example.

#Java reflection example program how to

How to get Field object using reflection.Member Interface in Java Reflection API.