You want to create a class Student with a private variable grade that can only be set if the value is between 0 and 100. Which is the best way to implement this using encapsulation?

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Java - Encapsulation

You want to create a class Student with a private variable grade that can only be set if the value is between 0 and 100. Which is the best way to implement this using encapsulation?

AMake <code>grade</code> public and check the value before assigning

BMake <code>grade</code> static and assign directly

CUse a protected <code>grade</code> variable and no setter

DUse a private <code>grade</code> variable with a setter that validates the value

Step-by-Step Solution

Solution:

Step 1: Understand encapsulation for validation
Encapsulation allows controlling how variables are set by using private variables and setters with checks.
Step 2: Choose the best practice
Using a private variable with a setter that validates the input ensures grade stays between 0 and 100.
Final Answer:
Use a private grade variable with a setter that validates the value -> Option D
Quick Check:
Setters with validation keep data safe [OK]

Quick Trick: Validate data inside setter to protect private variables [OK]

Common Mistakes:

Making variables public and trusting external code
Skipping validation in setter
Using static which shares data across all instances

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More Java Quizzes

You want to create a class Student with a private variable grade that can only be set if the value is between 0 and 100. Which is the best way to implement this using encapsulation?

Step 1: Understand encapsulation for validation

Step 2: Choose the best practice

Final Answer:

Quick Check:

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