1.7 - Optional Class
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Practice Questions
Test your understanding with targeted questions
What is the purpose of the Optional class in Java?
💡 Hint: Consider how you would check for null values.
How do you create an Optional instance from a potentially null value?
💡 Hint: Remember the method name that indicates possible absence of value.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What does the Optional class help prevent in Java?
💡 Hint: Recall the common exception types Java programs face.
True or False: Optional can hold null values.
💡 Hint: Think about what Optional encapsulates.
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Challenge Problems
Push your limits with advanced challenges
Write a method using Optional to return an integer value from a collection of numbers, where the number is searched based on criteria (e.g., greater than 10).
💡 Hint: Use streams to filter and find the first matching value.
Design an API method that returns a user based on username, using Optional in its return type.
💡 Hint: Consider how the absence of a user will be indicated.
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