java final assignment

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In Java, the final keyword is used to denote constants. It can be used with variables , methods , and classes .

Once any entity (variable, method or class) is declared final , it can be assigned only once. That is,

the final variable cannot be reinitialized with another value
the final method cannot be overridden
the final class cannot be extended

1. Java final Variable

In Java, we cannot change the value of a final variable. For example,

In the above program, we have created a final variable named age . And we have tried to change the value of the final variable.

When we run the program, we will get a compilation error with the following message.

Note : It is recommended to use uppercase to declare final variables in Java.

2. Java final Method

Before you learn about final methods and final classes, make sure you know about the Java Inheritance .

In Java, the final method cannot be overridden by the child class. For example,

In the above example, we have created a final method named display() inside the FinalDemo class. Here, the Main class inherits the FinalDemo class.

We have tried to override the final method in the Main class. When we run the program, we will get a compilation error with the following message.

3. Java final Class

In Java, the final class cannot be inherited by another class. For example,

In the above example, we have created a final class named FinalClass . Here, we have tried to inherit the final class by the Main class.

Introduction
Java final Variable
Java final Method
Java final Class

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final variables in Java

In Java, we can use final keyword with variables, methods, and classes. When the final keyword is used with a variable of primitive data types such as int, float, etc), the value of the variable cannot be changed.

Example 1: Usage of final with primitive datatype

Now you must be wondering what if we do use final keyword non-primitive variables, let us explore the same as we did above with the help of an example.

Note: Non-primitive variables are always references to objects in Java, the members of the referred object can be changed. final for non-primitive variables just means that they cannot be changed to refer to any other object.

Example 2: Usage of final with primitive datatype

Note: A final variable can’t be declared inside a function, this is so because scope of local variables of a function are limited to scope of function and declaring it their will be against the principle of immutability. If program demands a constant value then the final variable should be declared at class level and may be used in function.