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Practice Questions
Test your understanding with targeted questions related to the topic.
Question 1
Easy
What does it mean for a variable to be effectively final?
💡 Hint: Think about how the variable is used in a lambda.
Question 2
Easy
Can you use a variable that is modified after its declaration inside a lambda?
💡 Hint: Consider the definition of effectively final.
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
What is an effectively final variable?
- A variable that can change after declaration
- A variable never modified after assignment
- Any declared variable
💡 Hint: Reflect on the term 'effectively'.
Question 2
Can a lambda modify local variables in its enclosing scope?
- True
- False
💡 Hint: Think about the rules that restrict what lambdas can access.
Solve and get performance evaluation
Challenge Problems
Push your limits with challenges.
Question 1
Create a Java program that uses a lambda to sum the values of an array while trying to modify a local counter inside the lambda. What errors arise?
💡 Hint: Check what happens to any counter variable if you try to redefine it in the lambda.
Question 2
Illustrate with code how an effectively final variable can be used in a sorting lambda while clarifying why a non-final variable cannot be used.
💡 Hint: Experiment with creating two different versions of the same functionality.
Challenge and get performance evaluation