You want to protect a class's sensitive data but allow controlled updates only if the new value is positive. How would you implement this using data hiding in Java?

hard📝 Application Q15 of 15

Java - Encapsulation

AMake the variable public and check the value before assigning it outside the class

BMake the variable private and write a setter that updates only if the value is positive

CMake the variable protected and allow direct access in subclasses

DUse a public variable and no setter method

Step-by-Step Solution

Solution:

Step 1: Use private variable for data hiding
Keep the sensitive variable private to prevent direct external access.
Step 2: Implement setter with condition
Write a setter method that updates the variable only if the new value is positive, ensuring controlled updates.
Final Answer:
Make the variable private and write a setter that updates only if the value is positive -> Option B
Quick Check:
Private variable + conditional setter = safe updates [OK]

Quick Trick: Use private variable with conditional setter method [OK]

Common Mistakes:

Making variable public and trusting external checks
Using protected instead of private for sensitive data
Not validating data in setter method

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More Java Quizzes

You want to protect a class's sensitive data but allow controlled updates only if the new value is positive. How would you implement this using data hiding in Java?

Step 1: Use private variable for data hiding

Step 2: Implement setter with condition

Final Answer:

Quick Check:

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