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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What happens to local variables after the method execution?
💡 Hint: Think about the scope of local variables.
Question 2
Easy
Are instance variables lost when one object of a class is destroyed?
💡 Hint: Consider object-specific data.
Practice 4 more questions and get performance evaluation
Interactive Quizzes
Engage in quick quizzes to reinforce what you've learned and check your comprehension.
Question 1
How long do local variables exist?
- Until the method completes
- For the whole program
- Until the class is loaded
💡 Hint: Remember the scope of a method.
Question 2
True or False: Instance variables are shared among all objects.
- True
- False
💡 Hint: Think about object-oriented principles.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Design a Java class that simulates an online shopping cart. Include instance variables for item names and quantities and a class variable for the total cost. Demonstrate adding items to the cart and show the memory footprint for each item added.
💡 Hint: Consider how each item impacts the total and instance variable life.
Question 2
Create a mini-application that involves creating and destroying multiple cars. Show how instance variables of each car exist and get destroyed and monitor memory usage using an API.
💡 Hint: Use Java's memory management tools for tracking.
Challenge and get performance evaluation