{"id":12255,"date":"2023-01-27T11:12:22","date_gmt":"2023-01-27T11:12:22","guid":{"rendered":"https:\/\/www.prepbytes.com\/blog\/?p=12255"},"modified":"2023-06-19T07:14:38","modified_gmt":"2023-06-19T07:14:38","slug":"final-keyword-in-java","status":"publish","type":"post","link":"https:\/\/prepbytes.com\/blog\/final-keyword-in-java\/","title":{"rendered":"Final Keyword in Java"},"content":{"rendered":"

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In this article, we will learn about Final Keyword in Java along with various hands-on codes and examples. We will learn to use the final keyword in java with variables, methods, parameters, and also with classes. Then, we will look at the advantages and disadvantages of the final keyword in Java.<\/p>\n

Programmers frequently encounter situations in computer programming languages when they must finalize something that cannot be changed or overturned by anyone.<\/p>\n

They could occasionally need to finalize variables, forbid methods from being overridden, forbid other classes from the class inheritance, and many other things.<\/p>\n

The Final keyword in the Java programming language allows you to put the aforementioned scenario in a box by preventing other entities from overriding or changing the entity that was declared with the final keyword.<\/p>\n

What do you mean by Final Keyword in Java<\/h2>\n

Final keyword in Java is a non-access modifier that shows that an entity cannot be updated more than once. It was added to Java version 7 along with other capabilities.<\/p>\n

This implies that if a variable is declared with the final keyword, we cannot alter its value, override a method, or inherit a class.<\/strong><\/p>\n

Let’s use a simple example to explain it. Let’s say you need to create a class that everyone wants to use. How will they proceed? They will undoubtedly inherit your class along with theirs. They will be able to override your efforts in this circumstance.
\nTherefore, if you do not want anyone to override your logic, you may declare the methods final or just the variable final. If you do not want the variable to be reassigned, you can also define the variable final.<\/p>\n

In addition to finishing your methods and variables, all you need to do to prevent anyone from using your work is define a class with the final keywords. Therefore, even if a person tries to inherit, they will encounter a problem.<\/p>\n

Final Keyword in Java is used to restrict some of the features of inheritance.<\/p>\n

Final Keyword in Java can be Used With?<\/h2>\n

Final keyword in Java can be used with various entities such as methods, parameters, classes, and variables. This is illustrated below with the help of a diagram:<\/p>\n

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To understand where we may utilize the last keyword, have a look at the table below:<\/p>\n\n\n\n\n\n\n\n\n
S.No.<\/th>\nType<\/th>\nDescription<\/th>\n<\/tr>\n<\/thead>\n
1<\/td>\nFinal Variable<\/td>\nFinal Variables in Java cannot be re-assigned or given a new value.<\/td>\n<\/tr>\n
2<\/td>\nFinal Parameter<\/td>\nFinal Parameter will ensure that the value of the specified parameter cannot be changed in that function.<\/td>\n<\/tr>\n
3<\/td>\nFinal Method<\/td>\nMethods declared with the final keyword in Java cannot be overridden by any of its subclasses.<\/td>\n<\/tr>\n
4<\/td>\nFinal Class<\/td>\nClasses with the final keyword in java cannot be inherited or extended by the other classes.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Variables with Final Keyword in Java<\/h2>\n

When programmers require a constant variable, they can construct a final variable. A final variable cannot be altered or modified after initialization.<\/p>\n

Reassigning values to final variables results in a \u201cCompilation error\u201d. The same may be done with objects, however, in this instance, we can update an object’s property since we have only finalized the object’s reference variable.<\/p>\n

Final variables can be used with both primitive and non-primitive data types, such as int, float, double, and char (object references).<\/p>\n

How to Initialize Final Variable in Java?<\/h2>\n

To initialize a Final Variable in Java, we follow the syntax given below:<\/p>\n

For primitive Data Types:<\/strong><\/p>\n

final datatype varName = val;<\/code><\/pre>\n
For Non-primitive Data Types:<\/strong><\/p>\n
final  objectName = new ;<\/code><\/pre>\n
The code given below illustrates the usage of final Keyword in Java:<\/p>\n\t\t\t\t\t\t