What does the modifier 'final' signify when applied to a variable in Java?

• A. The variable can be modified later
• B. The variable cannot be changed
• C. The variable can only be accessed statically
• D. The variable can be inherited

Answer: (B)

When the modifier 'final' is applied to a variable in Java, it indicates that the variable cannot be changed once it has been initialized. This means that after assigning a value to a final variable, any attempt to assign a new value will result in a compilation error. Using 'final' helps to ensure that the variable maintains a constant value throughout its scope, which can improve code readability and maintainability, as it prevents accidental changes to what should be a constant.

The use of 'final' is particularly helpful in situations where you want to define constants, such as configuration values or fixed reference data, allowing for safer code since it enforces immutability for that variable. It is important to note that while the reference of a final variable cannot be changed, if the final variable is an object, the state of the object itself can still be modified unless the object's class also enforces immutability.

The other choices do not accurately reflect the meaning of the 'final' modifier in Java. For instance, stating that the variable can be modified later directly contradicts the core principle of 'final'. The suggestion that it can only be accessed statically misrepresents its access level, as final variables can be instance variables or static variables; the keyword