24.2. Key Concepts of Reflection

Try these first

1. 1.

   What method is used to obtain the Class object in Java?

   Hint

   Starts with Class and ends with forName.

2. 2.

   How can you access fields declared in a class?

   Hint

   It allows access to both public and private fields.

3. 3.

   What does the getDeclaredMethods() method return?

   • Only public methods
   • All methods including private
   • Only static methods

   Hint

   Think broadly about the access level of methods.

4. 4.

   True or False: Reflection can improve application performance by allowing direct access to class members.

   • True
   • False

   Hint

   Consider the efficiency of different access methods.

5. 5.

   You have a class Person with a private field age. Write a method that uses reflection to change age to 30 when given an object of Person.

   Hint

   Remember to handle exceptions like `NoSuchFieldException`.

6. 6.

   Discuss the implications of using reflection in a security-sensitive application. What measures could you take to mitigate risks?

   Hint

   Consider best practices in Java security.