Why string is final in Java with example?

The string is immutable means that we cannot change the object itself, but we can change the reference to the object. The string is made final to not allow others to extend it and destroy its immutability. If it was mutable, these parameters could be changed easily.

What is a final variable in Java?

Java final keyword is a non-access specifier that is used to restrict a class, variable, and method. If we initialize a variable with the final keyword, then we cannot modify its value. If we declare a method as final, then it cannot be overridden by any subclasses.

Can we make string as final?

We restrict to change the object itself. The String is immutable in Java because of the security, synchronization and concurrency, caching, and class loading. The reason of making string final is to destroy the immutability and to not allow others to extend it.

What does final mean in Java method?

You can declare some or all of a class’s methods final. You use the final keyword in a method declaration to indicate that the method cannot be overridden by subclasses. The Object class does this—a number of its methods are final .

Is String is a final class?

A String is a Final class & its immutable because it can’t be changed but can be referred to another object.

How do you make an object final in Java?

You declare a reference as final and not the actual object. That means, you cannot change the value of the reference (which is an address pointing to the object). So once you declare a reference as final, you cannot reassign it to another object. So declaring a variable as final is like making it a constant.

What is final method?

The final modifier for finalizing the implementations of classes, methods, and variables. We can declare a method as final, once you declare a method final it cannot be overridden. The main intention of making a method final would be that the content of the method should not be changed by any outsider.

How do you use the final variable in Java?

There are three ways to initialize a final variable:

1. You can initialize a final variable when it is declared. This approach is the most common.
2. A blank final variable can be initialized inside an instance-initializer block or inside the constructor.
3. A blank final static variable can be initialized inside a static block.

What is a final string?

Final means that the reference cannot be reassigned to a new string whereas immutable means that the referenced object cannot be changed. Strings in Java aren’t final by default but they are immutable.

Can we declare array as final?

The array arr is declared as final, but the elements of array are changed without any problem. Arrays are objects and object variables are always references in Java. So, when we declare an object variable as final, it means that the variable cannot be changed to refer to anything else.

What is final function?

What is the purpose of final class in Java?

The main purpose of using a class being declared as final is to prevent the class from being subclassed. If a class is marked as final then no class can inherit any feature from the final class. You cannot extend a final class.