Question

public class MyClass {
        ClassABC abc = new ClassABC();
} 

I just have a .class file of ClassABC. I want to print all the public, private, protected and default field values of “abc” object. How can I do this using Reflection?

Answer 1

You can get all fields by Class#getDeclaredFields(). Each returns a Field object of which you in turn can use the get() method to obtain the value. To get the values for non-public fields, you only need to set Field#setAccessible() to true.

So, in a nut:

ClassABC abc = new ClassABC();
for (Field field : abc.getClass().getDeclaredFields()) {
    field.setAccessible(true);
    String name = field.getName();
    Object value = field.get(abc);
    System.out.printf("Field name: %s, Field value: %s%n", name, value);
}

See also:

• Reflection tutorial