22.7 - Scope and Access
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Practice Questions
Test your understanding with targeted questions
What does it mean for a variable to be effectively final?
💡 Hint: Think about how the variable is used in a lambda.
Can you use a variable that is modified after its declaration inside a lambda?
💡 Hint: Consider the definition of effectively final.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is an effectively final variable?
💡 Hint: Reflect on the term 'effectively'.
Can a lambda modify local variables in its enclosing scope?
💡 Hint: Think about the rules that restrict what lambdas can access.
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Challenge Problems
Push your limits with advanced challenges
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.
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.
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