Practice Key Concepts Of Reflection (24.2) - Reflection and Annotations

Practise this section

8 questions

Flashcard drill
2 cards from this section. Quick, good the night before a test.
Exercise
6 questions · about 4 min · pass mark 70%. Hints available.
Sign up to start the exercise
Quiz
2 questions · about 1 min · pass mark 70%. Hints available.
Sign up to start the quiz

6 sample questions

Question 1.
What method is used to obtain the Class object in Java?
Show hintHide hint
Starts with Class and ends with forName.
Question 2.
How can you access fields declared in a class?
Show hintHide hint
It allows access to both public and private fields.
3Question 3.
What does the getDeclaredMethods() method return?
- Only public methods
- All methods including private
- Only static methods
Show hintHide hint
Think broadly about the access level of methods.
4Question 4.
True or False: Reflection can improve application performance by allowing direct access to class members.
- True
- False
Show hintHide hint
Consider the efficiency of different access methods.
Question 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.
Show hintHide hint
Remember to handle exceptions like `NoSuchFieldException`.
Question 6.
Discuss the implications of using reflection in a security-sensitive application. What measures could you take to mitigate risks?
Show hintHide hint
Consider best practices in Java security.

4 more questions in this section. Enroll free to practise them all.