The final Keyword
Explore how to use the final keyword in Java to declare variables as constants, preventing value changes during program execution. Learn to apply final in coding examples such as calculating a circle's circumference. Understand why using final avoids errors when variables should remain constant.
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Sometimes, we require a variable to not actually be a variable in Java programs. This means that the value of the variable should not change during the execution of the program. For example, if you’re using a double type variable, pi, to store the value of , which is a mathematical constant, you wouldn’t want to accidentally update it. Thus, for situations like these, we have the keyword: final.
The final keyword
To declare an unchangeable variable, just add final before the type and name of the variable as shown here:
final type name;
You can either initialize the variable straight away by using the ...