import java.lang.reflect.Field;

public class TestReflection {
    public static void main(String args[]) throws Exception {
        Student someStudent = new Student();
        
        // get information for field firstName - note it is private
        Field fs = someStudent.getClass().getDeclaredField("firstName");
        // make the field accessible
        fs.setAccessible(true);

        // display the value of the field; note someStudent.firstName illegal
        System.out.println("Value of " + fs.getName() + ": " + fs.get(someStudent));
        if (!fs.get(someStudent).equals("Sampath"))
            throw new AssertionError("Not Sampath");

        // can also modify the value
        fs.set(someStudent, "Trisha");
        System.out.println("Value of " + fs.getName() 
                           + " after changing: " + fs.get(someStudent));
        if (!fs.get(someStudent).equals("Trisha"))
            throw new AssertionError("Could not change to Trisha");
    }
}

class Student {
    private String firstName = "Sampath";
}