Question

Final int age = 21
age's value cannot be changed

A) True
B) False

Answer 1

The option is true because the use of the 'final' keyword in the declaration 'final int age = 21' restricts any subsequent modifications to the variable 'age.' Once a final variable is assigned a value, it cannot be altered, providing a mechanism for creating constants in Java.

Step-by-step explanation:

The use of the keyword 'final' in the declaration 'final int age = 21' indicates that the value assigned to the variable 'age' cannot be changed once it has been initialized. In Java, when a variable is declared as final, it becomes a constant, and any attempt to modify its value will result in a compilation error. Therefore, in the given scenario, the statement "age's value cannot be changed" is true.

In Java, the 'final' keyword is used to define constants. Once a final variable is assigned a value, it cannot be reassigned. This is particularly useful when you want to ensure that a variable retains a constant value throughout the program, preventing accidental modifications. In the case of 'int age = 21', the 'final' keyword ensures that 'age' remains 21 throughout the program's execution.

This feature is important in situations where the value of a variable should remain constant to maintain program integrity or when dealing with values that should not be altered. It enhances code clarity and helps prevent unintended side effects that may arise from modifying constant values. In summary, the 'final' keyword serves as a safeguard, signaling the programmer and the compiler that the value of the variable should not be changed once initialized.

Answer 2

A) True

In Java, declaring a variable as `final int age = 21` means that the value of 'age' cannot be changed after initialization. The 'final' keyword ensures immutability, making the statement true.

Step-by-step explanation:

In Java, the keyword 'final' is used to declare constants. When a variable is declared with the 'final' keyword, its value cannot be changed once it has been assigned. In this case, the variable 'age' is declared as a final int with an initial value of 21. This means that the value of 'age' cannot be modified or reassigned throughout the program's execution. Therefore, the statement "age's value cannot be changed" is true.

Furthermore, the use of the 'final' keyword ensures that the variable is a constant and follows a naming convention in uppercase letters with underscores, such as AGE_CONSTANT. This helps improve code readability and signals to other developers that the value should not be altered. The immutability provided by 'final' is essential in scenarios where maintaining a constant value is crucial, preventing unintended modifications and ensuring the stability of the program.

In conclusion, the 'final' keyword in the declaration of 'int age = 21' signifies that the value of 'age' is fixed and cannot be altered during the program's execution, making the statement true. This feature contributes to code reliability and reinforces the integrity of the declared constant in Java programming.